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Engine roughness, as in stops. starts. stops. starts.
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JL2A

Joined: 07 Apr 2015
Posts: 113
Location: Australia

Posted: Thu May 28, 2015 3:55 pm Post subject: Engine roughness, as in stops. starts. stops. starts.

Hi all, my formation partner had a bit of engine trouble last time we flew then I took the same plane up for a shake down and got the same result -



cruise power, 10 minutes into the flight, engine cuts abruptly, goes, cuts again, goes. Mixture full rich, carb heat on, didn't do it again but then these items were actioned after running fine for a few seconds.



The cuts were hard, as in no power not just roughness, and only for a split second, but enough to get your attention.



Speaking to two local CJ/Yak experts and they say it is likely the 'mid-range' mixture adjustment (I think the CJ book calls it 'cruise' mixture, same thing).



Has anyone here experienced the same? Would be curious as to what an earth is going on, intermittent failures are the worst!

hkgibby(at)yahoo.com
Guest

Posted: Thu May 28, 2015 4:46 pm Post subject: Engine roughness, as in stops. starts. stops. starts.

I would say your mag coils are going bad after getting hot.  Experienced it myself and know of another case and once mags were either replaced or at least the coil/s the problem disappeared.  I would consult the experts directly though for more in-depth troubleshooting.



Good luck- Hoot



Sent from my iPhone



 	  Quote: 	
		   On May 28, 2015, at 4:55 PM, "JL2A" <info(at)flyingwarbirds.com.au> wrote:

 

 

 

 Hi all, my formation partner had a bit of engine trouble last time we flew then I took the same plane up for a shake down and got the same result -

 

 cruise power, 10 minutes into the flight, engine cuts abruptly, goes, cuts again, goes. Mixture full rich, carb heat on, didn't do it again but then these items were actioned after running fine for a few seconds.

 

 The cuts were hard, as in no power not just roughness, and only for a split second, but enough to get your attention.

 

 Speaking to two local CJ/Yak experts and they say it is likely the 'mid-range' mixture adjustment (I think the CJ book calls it 'cruise' mixture, same thing).

 

 Has anyone here experienced the same? Would be curious as to what an earth is going on, intermittent failures are the worst!

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=442717#442717

GeorgeCoy

Joined: 02 Dec 2010
Posts: 310

Posted: Thu May 28, 2015 4:48 pm Post subject: Engine roughness, as in stops. starts. stops. starts.

I suspect you're getting air in the system someplace. The pressure carburetor will not tolerate any air bubbles. Check the gas collator had all the fittings.



George



Sent from my iPad



 	  Quote: 	
		   On May 28, 2015, at 7:55 PM, JL2A <info(at)flyingwarbirds.com.au> wrote:

 

 

 

 Hi all, my formation partner had a bit of engine trouble last time we flew then I took the same plane up for a shake down and got the same result -

 

 cruise power, 10 minutes into the flight, engine cuts abruptly, goes, cuts again, goes. Mixture full rich, carb heat on, didn't do it again but then these items were actioned after running fine for a few seconds.

 

 The cuts were hard, as in no power not just roughness, and only for a split second, but enough to get your attention.

 

 Speaking to two local CJ/Yak experts and they say it is likely the 'mid-range' mixture adjustment (I think the CJ book calls it 'cruise' mixture, same thing).

 

 Has anyone here experienced the same? Would be curious as to what an earth is going on, intermittent failures are the worst!

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=442717#442717

Viperdoc

Joined: 19 Apr 2014
Posts: 484
Location: 08A

Posted: Thu May 28, 2015 5:48 pm Post subject: Engine roughness, as in stops. starts. stops. starts.

Mag coil going bad will also do that. Typically occurs about 10 to 15 minutes of the flight.

Doc



Sent from my iPad



 	  Quote: 	
		   On May 28, 2015, at 6:55 PM, JL2A <info(at)flyingwarbirds.com.au> wrote:

 

 

 

 Hi all, my formation partner had a bit of engine trouble last time we flew then I took the same plane up for a shake down and got the same result -

 

 cruise power, 10 minutes into the flight, engine cuts abruptly, goes, cuts again, goes. Mixture full rich, carb heat on, didn't do it again but then these items were actioned after running fine for a few seconds.

 

 The cuts were hard, as in no power not just roughness, and only for a split second, but enough to get your attention.

 

 Speaking to two local CJ/Yak experts and they say it is likely the 'mid-range' mixture adjustment (I think the CJ book calls it 'cruise' mixture, same thing).

 

 Has anyone here experienced the same? Would be curious as to what an earth is going on, intermittent failures are the worst!

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=442717#442717

_________________
Viperdoc

migfighter42(at)gmail.com
Guest

Posted: Thu May 28, 2015 7:04 pm Post subject: Engine roughness, as in stops. starts. stops. starts.

my experience with that problem is the same as Doc mentioned. the aircraft would run fine until warmed up, normally in flight, then dramatic misses. replaced the coils in the magnetos, the problem went away.

Bill



Sent from my T-Mobile 4G LTE Device-------- Original message --------

From: Roger Kemp <f16viperdoc(at)me.com> 

Date: 05/28/2015  8:47 PM  (GMT-06:00) 

To: yak-list(at)matronics.com 

Subject: Re: Yak-List: Engine roughness, as in stops. starts. stops. starts. 




Mag coil going bad will also do that. Typically occurs about 10 to 15 minutes of the flight.

Doc


Sent from my iPad


 	  Quote: 	
		   On May 28, 2015, at 6:55 PM, JL2A <info(at)flyingwarbirds.com.au> wrote:

 

 

 

 Hi all, my formation partner had a bit of engine trouble last time we flew then I took the same plane up for a shake down and got the same result -

 

 cruise power, 10 minutes into the flight, engine cuts abruptly, goes, cuts again, goes. Mixture full rich, carb heat on, didn't do it again but then these items were actioned after running fine for a few seconds.

 

 The cuts were hard, as in no power not just roughness, and only for a split second, but enough to get your attention.

 

 Speaking to two local CJ/Yak experts and they say it is likely the 'mid-range' mixture adjustment (I think the CJ book calls it 'cruise' mixture, same thing).

 

 Has anyone here experienced the same? Would be curious as to what an earth is going on, intermittent failures are the worst!

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=442717#442717

dantpayne(at)icloud.com
Guest

Posted: Thu May 28, 2015 7:39 pm Post subject: Engine roughness, as in stops. starts. stops. starts.

Diving? 80 & 8?

Airspeed builds...engine starts to miss?

Dennis Savarese is the man to talk to...he will tell you the fix...I would tell you how to do it, but do not wish the glory...For Dennis informed me, and it worked.



Keep 'em Flyin',

Dan Payne

Owner, Pilot, A&P-IA

(423)-544-8946

Volunteer Aero

Dallas Bay Skypark

1824 E Crabtree Road

Hixson, TN 37343

"Where Airworthiness Means Business!"



On May 28, 2015, at 11:03 PM, migfighter42 <migfighter42(at)gmail.com (migfighter42(at)gmail.com)> wrote:

[quote]my experience with that problem is the same as Doc mentioned. the aircraft would run fine until warmed up, normally in flight, then dramatic misses. replaced the coils in the magnetos, the problem went away.

Bill

Sent from my T-Mobile 4G LTE Device



-------- Original message --------

From: Roger Kemp <f16viperdoc(at)me.com (f16viperdoc(at)me.com)> 

Date: 05/28/2015  8:47 PM  (GMT-06:00) 

To: yak-list(at)matronics.com (yak-list(at)matronics.com) 

Subject: Re: Engine roughness, as in stops. starts. stops. starts. 

--> Yak-List message posted by: Roger Kemp <f16viperdoc(at)me.com (f16viperdoc(at)me.com)>



Mag coil going bad will also do that. Typically occurs about 10 to 15 minutes of the flight.

Doc



Sent from my iPad



 	  Quote: 	
		   On May 28, 2015, at 6:55 PM, JL2A <info(at)flyingwarbirds.com.au (info(at)flyingwarbirds.com.au)> wrote:

 

 --> Yak-List message posted by: "JL2A" <info(at)flyingwarbirds.com.au (info(at)flyingwarbirds.com.au)>

 

 Hi all, my formation partner had a bit of engine trouble last time we flew then I took the same plane up for a shake down and got the same result -

 

 cruise power, 10 minutes into the flight, engine cuts abruptly, goes, cuts again, goes. Mixture full rich, carb heat on, didn't do it again but then these items were actioned after running fine for a few seconds.

 

 The cuts were hard, as in no power not just roughness, and only for a split second, but enough to get your attention.

 

 Speaking to two local CJ/Yak experts and they say it is likely the 'mid-range' mixture adjustment (I think the CJ book calls it 'cruise' mixture, same thing).

 

 Has anyone here experienced the same? Would be curious as to what an earth is going on, intermittent failures are the worst!

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=442717#442717

 

 

 

 http://www.matronics.com/Navig==========================p;             -====================================================nbsp;                     -Matt Dralle, List Admin.<===================================================


	


Â¦Â·â€º~â€°ÃÂ²,ÃžÃ™ÃŠ%Â¢Â½4Ã“M4}Â§râ€¹Â«â€°ÃªÃ§{(ÂºÂ¸Å¾Â8^aÂ©Å Ã‹Dâ„¢Â¨Â¥Å Ã®â„¢KÂ¶Å’jÃšÃ¨Å¾',.+-Ã¦ÂÂºÂ·Â¬5Â«Ã¢ÂÂ«hÂ®ÃšÂ®Å’,zÃ˜^â„¢Â©Ã².+-ÂºÃ˜Â¥Å Ã˜Å¾Â²Ã‹Å“â€¦Â«Å Ã‹TÅ¸Ã´Â®nÃ‡+Å â€ºbÂ¢p+rÂ¯y'Å¡ÂÃˆCÂ£	Ã¥Â¡Â§{ Â¬ÂÂ®Å’,x(ZÂ´P>-Â¢ÃˆZÂÃ¦Â§vkÅ“â€ kÅ“â€ j+yÂ¨kyÃ¸mÂ¶Å¸Ã¿Ãƒ&jÃšÃ¨Å¾',râ€°Â¿5Â«Ã¢ÂÂ«hÂâ€ Â¤.+-â€ Ã›iÃ¿Ã¼0Ã‚fÂÂ®â€°Ã¢rÃ‡(â€ºÃ³ZÂ¾(Â¶Å Ã˜jBÃ¢Â²ÃŸÃš0Ã‘8Ã’IaÃ¤T1$Å¡â„¢Ã¨+yÂ«\Â¢{^Å¾Ã–Â¥Â²â€ Â¯j)ZnWÂ¯â€°Â«aygâ€ºÅ Ã®Å¡Ã†Â¡ÂÃ§Ã¡Â¶ÃšÃ½Ãº+Âºk&jÃšÃ¨Å¾',râ€°Â¡Â¶ÃšÃ½Ãº+Âºk&jÃšÃ¨Å¾',râ€°Â¿hÂ¸Â¬Â´*'Â¶Â¸â€ºÂºÃ˜Â¨Âgâ€ºJ+^NÂ§â€œ*.~Å Ã²Â¢ÃªÃ zwÂ«Â¢Ã«,ÂºÅ¡hÂ®Ã“Â¶ÃÃ«jY^.+-Ã™Â¢ÂÂ¨kyÃ¸mÂ¶Å¸Ã¿Ãƒ&jÃšÃ¨Å¾',râ€°Â¿râ€°ÃÂ®&Ã®Â¶*'â€ Ã›iÃ¿Ã¼0Ã‚fÂÂ®â€°Ã¢rÃ‡(â€ºÃ·(Å¾ÃšÃ¢nÃ«bÂ¢ÃšÃ½Â¿ÃŸÂ¢{Â¦Â·Â¿nâ€¡rÃ¾f

[b]

dantpayne(at)icloud.com
Guest

Posted: Thu May 28, 2015 7:42 pm Post subject: Engine roughness, as in stops. starts. stops. starts.

Also, 

Have you pulled the top cover (MAG) and lubed the breaker felts with Machine oil (I.e. 3-1 singer seeing machine oil) ??



Keep 'em Flyin',

Dan Payne

Owner, Pilot, A&P-IA

(423)-544-8946

Volunteer Aero Sevive

Dallas Bay Skypark

1824 E Crabtree Road

Hixson, TN 37343

"Where Airworthiness Means Business!"



On May 28, 2015, at 11:03 PM, migfighter42 <migfighter42(at)gmail.com (migfighter42(at)gmail.com)> wrote:

[quote]my experience with that problem is the same as Doc mentioned. the aircraft would run fine until warmed up, normally in flight, then dramatic misses. replaced the coils in the magnetos, the problem went away.

Bill

Sent from my T-Mobile 4G LTE Device



-------- Original message --------

From: Roger Kemp <f16viperdoc(at)me.com (f16viperdoc(at)me.com)> 

Date: 05/28/2015  8:47 PM  (GMT-06:00) 

To: yak-list(at)matronics.com (yak-list(at)matronics.com) 

Subject: Re: Engine roughness, as in stops. starts. stops. starts. 

--> Yak-List message posted by: Roger Kemp <f16viperdoc(at)me.com (f16viperdoc(at)me.com)>



Mag coil going bad will also do that. Typically occurs about 10 to 15 minutes of the flight.

Doc



Sent from my iPad



 	  Quote: 	
		   On May 28, 2015, at 6:55 PM, JL2A <info(at)flyingwarbirds.com.au (info(at)flyingwarbirds.com.au)> wrote:

 

 --> Yak-List message posted by: "JL2A" <info(at)flyingwarbirds.com.au (info(at)flyingwarbirds.com.au)>

 

 Hi all, my formation partner had a bit of engine trouble last time we flew then I took the same plane up for a shake down and got the same result -

 

 cruise power, 10 minutes into the flight, engine cuts abruptly, goes, cuts again, goes. Mixture full rich, carb heat on, didn't do it again but then these items were actioned after running fine for a few seconds.

 

 The cuts were hard, as in no power not just roughness, and only for a split second, but enough to get your attention.

 

 Speaking to two local CJ/Yak experts and they say it is likely the 'mid-range' mixture adjustment (I think the CJ book calls it 'cruise' mixture, same thing).

 

 Has anyone here experienced the same? Would be curious as to what an earth is going on, intermittent failures are the worst!

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=442717#442717

 

 

 

 

 

 

 

&g==========================nbsp;        - The Yak-List Email Forum -==========================nbsp;        - MATRONICS WEB FORUMS -
	


   --> http://forums.ma==========================nbsp;          - List Contributnbsp;                        &nba href="http://www.matronics.com/contribution">http://www.matronics.com/co=========================================



Â¦Â·â€º~â€°ÃÂ²,ÃžÃ™ÃŠ%Â¢Â½4Ã“M4}Â§râ€¹Â«â€°ÃªÃ§{(ÂºÂ¸Å¾Â8^aÂ©Å Ã‹Dâ„¢Â¨Â¥Å Ã®â„¢KÂ¶Å’jÃšÃ¨Å¾',.+-Ã¦ÂÂºÂ·Â¬5Â«Ã¢ÂÂ«hÂ®ÃšÂ®Å’,zÃ˜^â„¢Â©Ã².+-ÂºÃ˜Â¥Å Ã˜Å¾Â²Ã‹Å“â€¦Â«Å Ã‹TÅ¸Ã´Â®nÃ‡+Å â€ºbÂ¢p+rÂ¯y'Å¡ÂÃˆCÂ£	Ã¥Â¡Â§{ Â¬ÂÂ®Å’,x(ZÂ´P>-Â¢ÃˆZÂÃ¦Â§vkÅ“â€ kÅ“â€ j+yÂ¨kyÃ¸mÂ¶Å¸Ã¿Ãƒ&jÃšÃ¨Å¾',râ€°Â¿5Â«Ã¢ÂÂ«hÂâ€ Â¤.+-â€ Ã›iÃ¿Ã¼0Ã‚fÂÂ®â€°Ã¢rÃ‡(â€ºÃ³ZÂ¾(Â¶Å Ã˜jBÃ¢Â²ÃŸÃš0Ã‘8Ã’IaÃ¤T1$Å¡â„¢Ã¨+yÂ«\Â¢{^Å¾Ã–Â¥Â²â€ Â¯j)ZnWÂ¯â€°Â«aygâ€ºÅ Ã®Å¡Ã†Â¡ÂÃ§Ã¡Â¶ÃšÃ½Ãº+Âºk&jÃšÃ¨Å¾',râ€°Â¡Â¶ÃšÃ½Ãº+Âºk&jÃšÃ¨Å¾',râ€°Â¿hÂ¸Â¬Â´*'Â¶Â¸â€ºÂºÃ˜Â¨Âgâ€ºJ+^NÂ§â€œ*.~Å Ã²Â¢ÃªÃ zwÂ«Â¢Ã«,ÂºÅ¡hÂ®Ã“Â¶ÃÃ«jY^.+-Ã™Â¢ÂÂ¨kyÃ¸mÂ¶Å¸Ã¿Ãƒ&jÃšÃ¨Å¾',râ€°Â¿râ€°ÃÂ®&Ã®Â¶*'â€ Ã›iÃ¿Ã¼0Ã‚fÂÂ®â€°Ã¢rÃ‡(â€ºÃ·(Å¾ÃšÃ¢nÃ«bÂ¢ÃšÃ½Â¿ÃŸÂ¢{Â¦Â·Â¿nâ€¡rÃ¾f

[b]

dantpayne(at)icloud.com
Guest

Posted: Thu May 28, 2015 7:47 pm Post subject: Engine roughness, as in stops. starts. stops. starts.

Adjust the points/ breaker felts on the mags...





Let not forget the dwell timing / distributor advance in our GTOs we drove to high school...



Keep 'em Flyin',

Dan Payne

Owner, Pilot, A&P-IA

(423)-544-8946

Volunteer Aero Service

Dallas Bay Skypark

1824 E Crabtree Road

Hixson, TN 37343

"Where Airworthiness Means Business!"



On May 28, 2015, at 11:03 PM, migfighter42 <migfighter42(at)gmail.com (migfighter42(at)gmail.com)> wrote:

[quote]my experience with that problem is the same as Doc mentioned. the aircraft would run fine until warmed up, normally in flight, then dramatic misses. replaced the coils in the magnetos, the problem went away.

Bill

Sent from my T-Mobile 4G LTE Device



-------- Original message --------

From: Roger Kemp <f16viperdoc(at)me.com (f16viperdoc(at)me.com)> 

Date: 05/28/2015  8:47 PM  (GMT-06:00) 

To: yak-list(at)matronics.com (yak-list(at)matronics.com) 

Subject: Re: Engine roughness, as in stops. starts. stops. starts. 

--> Yak-List message posted by: Roger Kemp <f16viperdoc(at)me.com (f16viperdoc(at)me.com)>



Mag coil going bad will also do that. Typically occurs about 10 to 15 minutes of the flight.

Doc



Sent from my iPad



 	  Quote: 	
		   On May 28, 2015, at 6:55 PM, JL2A <info(at)flyingwarbirds.com.au (info(at)flyingwarbirds.com.au)> wrote:

 

 --> Yak-List message posted by: "JL2A" <info(at)flyingwarbirds.com.au (info(at)flyingwarbirds.com.au)>

 

 Hi all, my formation partner had a bit of engine trouble last time we flew then I took the same plane up for a shake down and got the same result -

 

 cruise power, 10 minutes into the flight, engine cuts abruptly, goes, cuts again, goes. Mixture full rich, carb heat on, didn't do it again but then these items were actioned after running fine for a few seconds.

 

 The cuts were hard, as in no power not just roughness, and only for a split second, but enough to get your attention.

 

 Speaking to two local CJ/Yak experts and they say it is likely the 'mid-range' mixture adjustment (I think the CJ book calls it 'cruise' mixture, same thing).

 

 Has anyone here experienced the same? Would be curious as to what an earth is going on, intermittent failures are the worst!

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=442717#442717

 

 

 

 http://www.matronics.com/Navig==========================p;             -====================================================nbsp;                     -Matt Dralle, List Admin.<===================================================


	


Â¦Â·â€º~â€°ÃÂ²,ÃžÃ™ÃŠ%Â¢Â½4Ã“M4}Â§râ€¹Â«â€°ÃªÃ§{(ÂºÂ¸Å¾Â8^aÂ©Å Ã‹Dâ„¢Â¨Â¥Å Ã®â„¢KÂ¶Å’jÃšÃ¨Å¾',.+-Ã¦ÂÂºÂ·Â¬5Â«Ã¢ÂÂ«hÂ®ÃšÂ®Å’,zÃ˜^â„¢Â©Ã².+-ÂºÃ˜Â¥Å Ã˜Å¾Â²Ã‹Å“â€¦Â«Å Ã‹TÅ¸Ã´Â®nÃ‡+Å â€ºbÂ¢p+rÂ¯y'Å¡ÂÃˆCÂ£	Ã¥Â¡Â§{ Â¬ÂÂ®Å’,x(ZÂ´P>-Â¢ÃˆZÂÃ¦Â§vkÅ“â€ kÅ“â€ j+yÂ¨kyÃ¸mÂ¶Å¸Ã¿Ãƒ&jÃšÃ¨Å¾',râ€°Â¿5Â«Ã¢ÂÂ«hÂâ€ Â¤.+-â€ Ã›iÃ¿Ã¼0Ã‚fÂÂ®â€°Ã¢rÃ‡(â€ºÃ³ZÂ¾(Â¶Å Ã˜jBÃ¢Â²ÃŸÃš0Ã‘8Ã’IaÃ¤T1$Å¡â„¢Ã¨+yÂ«\Â¢{^Å¾Ã–Â¥Â²â€ Â¯j)ZnWÂ¯â€°Â«aygâ€ºÅ Ã®Å¡Ã†Â¡ÂÃ§Ã¡Â¶ÃšÃ½Ãº+Âºk&jÃšÃ¨Å¾',râ€°Â¡Â¶ÃšÃ½Ãº+Âºk&jÃšÃ¨Å¾',râ€°Â¿hÂ¸Â¬Â´*'Â¶Â¸â€ºÂºÃ˜Â¨Âgâ€ºJ+^NÂ§â€œ*.~Å Ã²Â¢ÃªÃ zwÂ«Â¢Ã«,ÂºÅ¡hÂ®Ã“Â¶ÃÃ«jY^.+-Ã™Â¢ÂÂ¨kyÃ¸mÂ¶Å¸Ã¿Ãƒ&jÃšÃ¨Å¾',râ€°Â¿râ€°ÃÂ®&Ã®Â¶*'â€ Ã›iÃ¿Ã¼0Ã‚fÂÂ®â€°Ã¢rÃ‡(â€ºÃ·(Å¾ÃšÃ¢nÃ«bÂ¢ÃšÃ½Â¿ÃŸÂ¢{Â¦Â·Â¿nâ€¡rÃ¾f

[b]

dantpayne(at)icloud.com
Guest

Posted: Thu May 28, 2015 7:51 pm Post subject: Engine roughness, as in stops. starts. stops. starts.

I have to reapectfully disagree with Doc Kemp on that accord...I suspect a broken lead in the ignition harness, or a cracked ceramic in one if you 18 existing plugs...



Keep 'em Flyin',

Dan Payne

Owner, Pilot, A&P-IA

(423)-544-8946

Volunteer Aero Services

Dallas Bay Skypark

1824 E Crabtree Road

Hixson, TN 37343

"Where Airworthiness Means Business!"



On May 28, 2015, at 11:42 PM, Dan Payne <dantpayne(at)icloud.com (dantpayne(at)icloud.com)> wrote:

[quote]Also, 

Have you pulled the top cover (MAG) and lubed the breaker felts with Machine oil (I.e. 3-1 singer seeing machine oil) ??



Keep 'em Flyin',

Dan Payne

Owner, Pilot, A&P-IA

(423)-544-8946

Volunteer Aero Sevive

Dallas Bay Skypark

1824 E Crabtree Road

Hixson, TN 37343

"Where Airworthiness Means Business!"



On May 28, 2015, at 11:03 PM, migfighter42 <migfighter42(at)gmail.com (migfighter42(at)gmail.com)> wrote:

 	  Quote: 	
		  my experience with that problem is the same as Doc mentioned. the aircraft would run fine until warmed up, normally in flight, then dramatic misses. replaced the coils in the magnetos, the problem went away.

Bill

Sent from my T-Mobile 4G LTE Device



-------- Original message --------

From: Roger Kemp <f16viperdoc(at)me.com (f16viperdoc(at)me.com)> 

Date: 05/28/2015  8:47 PM  (GMT-06:00) 

To: yak-list(at)matronics.com (yak-list(at)matronics.com) 

Subject: Re: Yak-List: Engine roughness, as in stops. starts. stops. starts. 

--> Yak-List message posted by: Roger Kemp <f16viperdoc(at)me.com (f16viperdoc(at)me.com)>



Mag coil going bad will also do that. Typically occurs about 10 to 15 minutes of the flight.

Doc



Sent from my iPad



 	  Quote: 	
		   On May 28, 2015, at 6:55 PM, JL2A <info(at)flyingwarbirds.com.au (info(at)flyingwarbirds.com.au)> wrote:

 

 --> Yak-List message posted by: "JL2A" <info(at)flyingwarbirds.com.au (info(at)flyingwarbirds.com.au)>

 

 Hi all, my formation partner had a bit of engine trouble last time we flew then I took the same plane up for a shake down and got the same result -

 

 cruise power, 10 minutes into the flight, engine cuts abruptly, goes, cuts again, goes. Mixture full rich, carb heat on, didn't do it again but then these items were actioned after running fine for a few seconds.

 

 The cuts were hard, as in no power not just roughness, and only for a split second, but enough to get your attention.

 

 Speaking to two local CJ/Yak experts and they say it is likely the 'mid-range' mixture adjustment (I think the CJ book calls it 'cruise' mixture, same thing).

 

 Has anyone here experienced the same? Would be curious as to what an earth is going on, intermittent failures are the worst!

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=442717#442717

 

 

 

 

 

 

 

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   --> http://forums.ma==========================nbsp;          - List Contributnbsp;                        &nba href="http://www.matronics.com/contribution">http://www.matronics.com/co=========================================



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  	  Quote: 	
		  



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"3D"courier" new,courier"="">[url=3D"http://www.matronics.com/Navigator?Yak-List"]http://www.matronics.com/Navigator?Yak-List[/url]

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//forums.matronics.com

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D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D



	


[b]

dantpayne(at)icloud.com
Guest

Posted: Thu May 28, 2015 8:00 pm Post subject: Engine roughness, as in stops. starts. stops. starts.

P.S.:

Why don't you all adjust your valves?? 

I do many annuals on "rich" people's airplanes who know nothing about Radials....

The engines are reliable. The airframes are bullet proof, and Denis Savarese is your go to guy on 4th & 10!



Keep 'em Flyin',

Dan Payne

Owner, Pilot, A&P-IA

(423)-544-8946

Volunteer Aero Services

Dallas Bay Skypark

1824 E Crabtree Road

Hixson, TN 37343

"Where Airworthiness Means Business!"



On May 28, 2015, at 11:46 PM, Dan Payne <dantpayne(at)icloud.com (dantpayne(at)icloud.com)> wrote:

[quote]Adjust the points/ breaker felts on the mags...





Let not forget the dwell timing / distributor advance in our GTOs we drove to high school...



Keep 'em Flyin',

Dan Payne

Owner, Pilot, A&P-IA

(423)-544-8946

Volunteer Aero Service

Dallas Bay Skypark

1824 E Crabtree Road

Hixson, TN 37343

"Where Airworthiness Means Business!"



On May 28, 2015, at 11:03 PM, migfighter42 <migfighter42(at)gmail.com (migfighter42(at)gmail.com)> wrote:

 	  Quote: 	
		  my experience with that problem is the same as Doc mentioned. the aircraft would run fine until warmed up, normally in flight, then dramatic misses. replaced the coils in the magnetos, the problem went away.

Bill

Sent from my T-Mobile 4G LTE Device



-------- Original message --------

From: Roger Kemp <f16viperdoc(at)me.com (f16viperdoc(at)me.com)> 

Date: 05/28/2015  8:47 PM  (GMT-06:00) 

To: yak-list(at)matronics.com (yak-list(at)matronics.com) 

Subject: Re: Engine roughness, as in stops. starts. stops. starts. 

--> Yak-List message posted by: Roger Kemp <f16viperdoc(at)me.com (f16viperdoc(at)me.com)>



Mag coil going bad will also do that. Typically occurs about 10 to 15 minutes of the flight.

Doc



Sent from my iPad



 	  Quote: 	
		   On May 28, 2015, at 6:55 PM, JL2A <info(at)flyingwarbirds.com.au (info(at)flyingwarbirds.com.au)> wrote:

 

 --> Yak-List message posted by: "JL2A" <info(at)flyingwarbirds.com.au (info(at)flyingwarbirds.com.au)>

 

 Hi all, my formation partner had a bit of engine trouble last time we flew then I took the same plane up for a shake down and got the same result -

 

 cruise power, 10 minutes into the flight, engine cuts abruptly, goes, cuts again, goes. Mixture full rich, carb heat on, didn't do it again but then these items were actioned after running fine for a few seconds.

 

 The cuts were hard, as in no power not just roughness, and only for a split second, but enough to get your attention.

 

 Speaking to two local CJ/Yak experts and they say it is likely the 'mid-range' mixture adjustment (I think the CJ book calls it 'cruise' mixture, same thing).

 

 Has anyone here experienced the same? Would be curious as to what an earth is going on, intermittent failures are the worst!

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=442717#442717

 

 

 

 http://www.matronics.com/Navig==========================p;             -====================================================nbsp;                     -Matt Dralle, List Admin.<===================================================


	


Â¦Â·â€º~â€°ÃÂ²,ÃžÃ™ÃŠ%Â¢Â½4Ã“M4}Â§râ€¹Â«â€°ÃªÃ§{(ÂºÂ¸Å¾Â8^aÂ©Å Ã‹Dâ„¢Â¨Â¥Å Ã®â„¢KÂ¶Å’jÃšÃ¨Å¾',.+-Ã¦ÂÂºÂ·Â¬5Â«Ã¢ÂÂ«hÂ®ÃšÂ®Å’,zÃ˜^â„¢Â©Ã².+-ÂºÃ˜Â¥Å Ã˜Å¾Â²Ã‹Å“â€¦Â«Å Ã‹TÅ¸Ã´Â®nÃ‡+Å â€ºbÂ¢p+rÂ¯y'Å¡ÂÃˆCÂ£	Ã¥Â¡Â§{ Â¬ÂÂ®Å’,x(ZÂ´P>-Â¢ÃˆZÂÃ¦Â§vkÅ“â€ kÅ“â€ j+yÂ¨kyÃ¸mÂ¶Å¸Ã¿Ãƒ&jÃšÃ¨Å¾',râ€°Â¿5Â«Ã¢ÂÂ«hÂâ€ Â¤.+-â€ Ã›iÃ¿Ã¼0Ã‚fÂÂ®â€°Ã¢rÃ‡(â€ºÃ³ZÂ¾(Â¶Å Ã˜jBÃ¢Â²ÃŸÃš0Ã‘8Ã’IaÃ¤T1$Å¡â„¢Ã¨+yÂ«\Â¢{^Å¾Ã–Â¥Â²â€ Â¯j)ZnWÂ¯â€°Â«aygâ€ºÅ Ã®Å¡Ã†Â¡ÂÃ§Ã¡Â¶ÃšÃ½Ãº+Âºk&jÃšÃ¨Å¾',râ€°Â¡Â¶ÃšÃ½Ãº+Âºk&jÃšÃ¨Å¾',râ€°Â¿hÂ¸Â¬Â´*'Â¶Â¸â€ºÂºÃ˜Â¨Âgâ€ºJ+^NÂ§â€œ*.~Å Ã²Â¢ÃªÃ zwÂ«Â¢Ã«,ÂºÅ¡hÂ®Ã“Â¶ÃÃ«jY^.+-Ã™Â¢ÂÂ¨kyÃ¸mÂ¶Å¸Ã¿Ãƒ&jÃšÃ¨Å¾',râ€°Â¿râ€°ÃÂ®&Ã®Â¶*'â€ Ã›iÃ¿Ã¼0Ã‚fÂÂ®â€°Ã¢rÃ‡(â€ºÃ·(Å¾ÃšÃ¢nÃ«bÂ¢ÃšÃ½Â¿ÃŸÂ¢{Â¦Â·Â¿nâ€¡rÃ¾f





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ist"">http://www.matronics.com/Navigator?Yak-List

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[b]

Dawg

Joined: 19 May 2013
Posts: 355

Posted: Thu May 28, 2015 9:01 pm Post subject: Engine roughness, as in stops. starts. stops. starts.

Adjust my what?? v-a-l-v-e-s? Like consonants?

You do many annuals? You must be â€œrich"

Iâ€™m not â€œrichâ€, no nothing about radials, why should I, we have guys like you that are willing to do it while we lounge by the pool, fly, camp, hike, bike, fly some more etc.So everyone gets what they want. 

I see your company name says â€œVolunteerâ€ well, donâ€™t. Problem for you, solved.

Shot mine, NOT bullet proof. 

Keep smiling.

Bill Geipel

Owner, pilot, not A&P-IA

canâ€™t afford cell phone.

On May 29, 2015, at 1:00 PM, Dan Payne <dantpayne(at)icloud.com (dantpayne(at)icloud.com)> wrote:

[quote]P.S.:

Why don't you all adjust your valves?? 

I do many annuals on "rich" people's airplanes who know nothing about Radials....

The engines are reliable. The airframes are bullet proof, and Denis Savarese is your go to guy on 4th & 10!



Keep 'em Flyin',

Dan Payne

Owner, Pilot, A&P-IA

(423)-544-8946

Volunteer Aero Services

Dallas Bay Skypark

1824 E Crabtree Road

Hixson, TN 37343

"Where Airworthiness Means Business!"



On May 28, 2015, at 11:46 PM, Dan Payne <dantpayne(at)icloud.com (dantpayne(at)icloud.com)> wrote:

 	  Quote: 	
		  Adjust the points/ breaker felts on the mags...





Let not forget the dwell timing / distributor advance in our GTOs we drove to high school...



Keep 'em Flyin',

Dan Payne

Owner, Pilot, A&P-IA

(423)-544-8946

Volunteer Aero Service

Dallas Bay Skypark

1824 E Crabtree Road

Hixson, TN 37343

"Where Airworthiness Means Business!"



On May 28, 2015, at 11:03 PM, migfighter42 <migfighter42(at)gmail.com (migfighter42(at)gmail.com)> wrote:

 	  Quote: 	
		  my experience with that problem is the same as Doc mentioned. the aircraft would run fine until warmed up, normally in flight, then dramatic misses. replaced the coils in the magnetos, the problem went away.

Bill

Sent from my T-Mobile 4G LTE Device



-------- Original message --------

From: Roger Kemp <f16viperdoc(at)me.com (f16viperdoc(at)me.com)> 

Date: 05/28/2015  8:47 PM  (GMT-06:00) 

To: yak-list(at)matronics.com (yak-list(at)matronics.com) 

Subject: Re: Engine roughness, as in stops. starts. stops. starts. 

--> Yak-List message posted by: Roger Kemp <f16viperdoc(at)me.com (f16viperdoc(at)me.com)>



Mag coil going bad will also do that. Typically occurs about 10 to 15 minutes of the flight.

Doc



Sent from my iPad



 	  Quote: 	
		   On May 28, 2015, at 6:55 PM, JL2A <info(at)flyingwarbirds.com.au (info(at)flyingwarbirds.com.au)> wrote:

 

 --> Yak-List message posted by: "JL2A" <info(at)flyingwarbirds.com.au (info(at)flyingwarbirds.com.au)>

 

 Hi all, my formation partner had a bit of engine trouble last time we flew then I took the same plane up for a shake down and got the same result -

 

 cruise power, 10 minutes into the flight, engine cuts abruptly, goes, cuts again, goes. Mixture full rich, carb heat on, didn't do it again but then these items were actioned after running fine for a few seconds.

 

 The cuts were hard, as in no power not just roughness, and only for a split second, but enough to get your attention.

 

 Speaking to two local CJ/Yak experts and they say it is likely the 'mid-range' mixture adjustment (I think the CJ book calls it 'cruise' mixture, same thing).

 

 Has anyone here experienced the same? Would be curious as to what an earth is going on, intermittent failures are the worst!

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=442717#442717

 

 

 

 http://www.matronics.com/Navig==========================p;             -===========================nbsp;                     -Matt Dralle, List Admin.<==========================


	


Â¦Â·â€º~â€°ÃÂ²,ÃžÃ™ÃŠ%Â¢Â½4Ã“M4}Â§râ€¹Â«â€°ÃªÃ§{(ÂºÂ¸Å¾Â8^aÂ©Å Ã‹Dâ„¢Â¨Â¥Å Ã®â„¢KÂ¶Å’jÃšÃ¨Å¾',.+-Ã¦ÂÂºÂ·Â¬5Â«Ã¢ÂÂ«hÂ®ÃšÂ®Å’,zÃ˜^â„¢Â©Ã².+-ÂºÃ˜Â¥Å Ã˜Å¾Â²Ã‹Å“â€¦Â«Å Ã‹TÅ¸Ã´Â®nÃ‡+Å â€ºbÂ¢p+rÂ¯y'Å¡ÂÃˆCÂ£	Ã¥Â¡Â§{ Â¬ÂÂ®Å’,x(ZÂ´P>-Â¢ÃˆZÂÃ¦Â§vkÅ“â€ kÅ“â€ j+yÂ¨kyÃ¸mÂ¶Å¸Ã¿Ãƒ&jÃšÃ¨Å¾',râ€°Â¿5Â«Ã¢ÂÂ«hÂâ€ Â¤.+-â€ Ã›iÃ¿Ã¼0Ã‚fÂÂ®â€°Ã¢rÃ‡(â€ºÃ³ZÂ¾(Â¶Å Ã˜jBÃ¢Â²ÃŸÃš0Ã‘8Ã’IaÃ¤T1$Å¡â„¢Ã¨+yÂ«\Â¢{^Å¾Ã–Â¥Â²â€ Â¯j)ZnWÂ¯â€°Â«aygâ€ºÅ Ã®Å¡Ã†Â¡ÂÃ§Ã¡Â¶ÃšÃ½Ãº+Âºk&jÃšÃ¨Å¾',râ€°Â¡Â¶ÃšÃ½Ãº+Âºk&jÃšÃ¨Å¾',râ€°Â¿hÂ¸Â¬Â´*'Â¶Â¸â€ºÂºÃ˜Â¨Âgâ€ºJ+^NÂ§â€œ*.~Å Ã²Â¢ÃªÃ zwÂ«Â¢Ã«,ÂºÅ¡hÂ®Ã“Â¶ÃÃ«jY^.+-Ã™Â¢ÂÂ¨kyÃ¸mÂ¶Å¸Ã¿Ãƒ&jÃšÃ¨Å¾',râ€°Â¿râ€°ÃÂ®&Ã®Â¶*'â€ Ã›iÃ¿Ã¼0Ã‚fÂÂ®â€°Ã¢rÃ‡(â€ºÃ·(Å¾ÃšÃ¢nÃ«bÂ¢ÃšÃ½Â¿ÃŸÂ¢{Â¦Â·Â¿nâ€¡rÃ¾f



D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

ist"">http://www.matronics.com/Navigator?Yak-List

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[b]

_________________
Dawg

dantpayne(at)icloud.com
Guest

Posted: Thu May 28, 2015 9:14 pm Post subject: Engine roughness, as in stops. starts. stops. starts.

Do you "no" or "Know" nothing about radials?  

I'm not on this list to get into a dick measuring contest. Your wife may be hotter than mine, but I can assure you that I pay more attention to my airplanes than my own "better half"

Let me remind you we are all on this list to help each other...



Keep 'em Flyin',

Dan Payne

Owner, Pilot, A&P-IA

(423)-544-8946

Volunteer Aero 

Dallas Bay Skypark

1824 E Crabtree Road

Hixson, TN 37343

"Where Airworthiness Means Business!"



On May 29, 2015, at 1:01 AM, Bill Geipel <l129bs(at)gmail.com (l129bs(at)gmail.com)> wrote:

[quote]Adjust my what?? v-a-l-v-e-s? Like consonants?

You do many annuals? You must be â€œrich"

Iâ€™m not â€œrichâ€, no nothing about radials, why should I, we have guys like you that are willing to do it while we lounge by the pool, fly, camp, hike, bike, fly some more etc.So everyone gets what they want. 

I see your company name says â€œVolunteerâ€ well, donâ€™t. Problem for you, solved.

Shot mine, NOT bullet proof. 

Keep smiling.

Bill Geipel

Owner, pilot, not A&P-IA

canâ€™t afford cell phone.

On May 29, 2015, at 1:00 PM, Dan Payne <dantpayne(at)icloud.com (dantpayne(at)icloud.com)> wrote:

 	  Quote: 	
		  P.S.:

Why don't you all adjust your valves?? 

I do many annuals on "rich" people's airplanes who know nothing about Radials....

The engines are reliable. The airframes are bullet proof, and Denis Savarese is your go to guy on 4th & 10!



Keep 'em Flyin',

Dan Payne

Owner, Pilot, A&P-IA

(423)-544-8946

Volunteer Aero Services

Dallas Bay Skypark

1824 E Crabtree Road

Hixson, TN 37343

"Where Airworthiness Means Business!"



On May 28, 2015, at 11:46 PM, Dan Payne <dantpayne(at)icloud.com (dantpayne(at)icloud.com)> wrote:

 	  Quote: 	
		  Adjust the points/ breaker felts on the mags...





Let not forget the dwell timing / distributor advance in our GTOs we drove to high school...



Keep 'em Flyin',

Dan Payne

Owner, Pilot, A&P-IA

(423)-544-8946

Volunteer Aero Service

Dallas Bay Skypark

1824 E Crabtree Road

Hixson, TN 37343

"Where Airworthiness Means Business!"



On May 28, 2015, at 11:03 PM, migfighter42 <migfighter42(at)gmail.com (migfighter42(at)gmail.com)> wrote:

 	  Quote: 	
		  my experience with that problem is the same as Doc mentioned. the aircraft would run fine until warmed up, normally in flight, then dramatic misses. replaced the coils in the magnetos, the problem went away.

Bill

Sent from my T-Mobile 4G LTE Device



-------- Original message --------

From: Roger Kemp <f16viperdoc(at)me.com (f16viperdoc(at)me.com)> 

Date: 05/28/2015  8:47 PM  (GMT-06:00) 

To: yak-list(at)matronics.com (yak-list(at)matronics.com) 

Subject: Re: Engine roughness, as in stops. starts. stops. starts. 

--> Yak-List message posted by: Roger Kemp <f16viperdoc(at)me.com (f16viperdoc(at)me.com)>



Mag coil going bad will also do that. Typically occurs about 10 to 15 minutes of the flight.

Doc



Sent from my iPad



 	  Quote: 	
		   On May 28, 2015, at 6:55 PM, JL2A <info(at)flyingwarbirds.com.au (info(at)flyingwarbirds.com.au)> wrote:

 

 --> Yak-List message posted by: "JL2A" <info(at)flyingwarbirds.com.au (info(at)flyingwarbirds.com.au)>

 

 Hi all, my formation partner had a bit of engine trouble last time we flew then I took the same plane up for a shake down and got the same result -

 

 cruise power, 10 minutes into the flight, engine cuts abruptly, goes, cuts again, goes. Mixture full rich, carb heat on, didn't do it again but then these items were actioned after running fine for a few seconds.

 

 The cuts were hard, as in no power not just roughness, and only for a split second, but enough to get your attention.

 

 Speaking to two local CJ/Yak experts and they say it is likely the 'mid-range' mixture adjustment (I think the CJ book calls it 'cruise' mixture, same thing).

 

 Has anyone here experienced the same? Would be curious as to what an earth is going on, intermittent failures are the worst!

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=442717#442717

 

 

 

 http://www.matronics.com/Navig==========================p;             -===========================nbsp;                     -Matt Dralle, List Admin.<==========================


	


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[b]

dantpayne(at)icloud.com
Guest

Posted: Thu May 28, 2015 9:20 pm Post subject: Engine roughness, as in stops. starts. stops. starts.

Ps....if you throw fuel to it mid-flight and it burst back to life...I would suspect a worn out engine driven pump..



Keep 'em Flyin',

Dan Payne

Owner, Pilot, A&P-IA

(423)-544-8946

Volunteer Aero

Dallas Bay Skypark

1824 E Crabtree Road

Hixson, TN 37343

"Where Airworthiness Means Business!"



On May 29, 2015, at 1:01 AM, Bill Geipel <l129bs(at)gmail.com (l129bs(at)gmail.com)> wrote:

[quote]Adjust my what?? v-a-l-v-e-s? Like consonants?

You do many annuals? You must be â€œrich"

Iâ€™m not â€œrichâ€, no nothing about radials, why should I, we have guys like you that are willing to do it while we lounge by the pool, fly, camp, hike, bike, fly some more etc.So everyone gets what they want. 

I see your company name says â€œVolunteerâ€ well, donâ€™t. Problem for you, solved.

Shot mine, NOT bullet proof. 

Keep smiling.

Bill Geipel

Owner, pilot, not A&P-IA

canâ€™t afford cell phone.

On May 29, 2015, at 1:00 PM, Dan Payne <dantpayne(at)icloud.com (dantpayne(at)icloud.com)> wrote:

 	  Quote: 	
		  P.S.:

Why don't you all adjust your valves?? 

I do many annuals on "rich" people's airplanes who know nothing about Radials....

The engines are reliable. The airframes are bullet proof, and Denis Savarese is your go to guy on 4th & 10!



Keep 'em Flyin',

Dan Payne

Owner, Pilot, A&P-IA

(423)-544-8946

Volunteer Aero Services

Dallas Bay Skypark

1824 E Crabtree Road

Hixson, TN 37343

"Where Airworthiness Means Business!"



On May 28, 2015, at 11:46 PM, Dan Payne <dantpayne(at)icloud.com (dantpayne(at)icloud.com)> wrote:

 	  Quote: 	
		  Adjust the points/ breaker felts on the mags...





Let not forget the dwell timing / distributor advance in our GTOs we drove to high school...



Keep 'em Flyin',

Dan Payne

Owner, Pilot, A&P-IA

(423)-544-8946

Volunteer Aero Service

Dallas Bay Skypark

1824 E Crabtree Road

Hixson, TN 37343

"Where Airworthiness Means Business!"



On May 28, 2015, at 11:03 PM, migfighter42 <migfighter42(at)gmail.com (migfighter42(at)gmail.com)> wrote:

 	  Quote: 	
		  my experience with that problem is the same as Doc mentioned. the aircraft would run fine until warmed up, normally in flight, then dramatic misses. replaced the coils in the magnetos, the problem went away.

Bill

Sent from my T-Mobile 4G LTE Device



-------- Original message --------

From: Roger Kemp <f16viperdoc(at)me.com (f16viperdoc(at)me.com)> 

Date: 05/28/2015  8:47 PM  (GMT-06:00) 

To: yak-list(at)matronics.com (yak-list(at)matronics.com) 

Subject: Re: Engine roughness, as in stops. starts. stops. starts. 

--> Yak-List message posted by: Roger Kemp <f16viperdoc(at)me.com (f16viperdoc(at)me.com)>



Mag coil going bad will also do that. Typically occurs about 10 to 15 minutes of the flight.

Doc



Sent from my iPad



 	  Quote: 	
		   On May 28, 2015, at 6:55 PM, JL2A <info(at)flyingwarbirds.com.au (info(at)flyingwarbirds.com.au)> wrote:

 

 --> Yak-List message posted by: "JL2A" <info(at)flyingwarbirds.com.au (info(at)flyingwarbirds.com.au)>

 

 Hi all, my formation partner had a bit of engine trouble last time we flew then I took the same plane up for a shake down and got the same result -

 

 cruise power, 10 minutes into the flight, engine cuts abruptly, goes, cuts again, goes. Mixture full rich, carb heat on, didn't do it again but then these items were actioned after running fine for a few seconds.

 

 The cuts were hard, as in no power not just roughness, and only for a split second, but enough to get your attention.

 

 Speaking to two local CJ/Yak experts and they say it is likely the 'mid-range' mixture adjustment (I think the CJ book calls it 'cruise' mixture, same thing).

 

 Has anyone here experienced the same? Would be curious as to what an earth is going on, intermittent failures are the worst!

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=442717#442717

 

 

 

 http://www.matronics.com/Navig==========================p;             -===========================nbsp;                     -Matt Dralle, List Admin.<==========================


	


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[b]

dantpayne(at)icloud.com
Guest

Posted: Thu May 28, 2015 9:28 pm Post subject: Engine roughness, as in stops. starts. stops. starts.

However..."engine cuts abruptly, goes, cuts again, goes. Mixture full rich, carb heat on, didn't do it again but then these items were actioned after running fine for a few seconds."

If you went full rich, then turned on the carb heat (making the mixture even more rich) that's answers you own dilemma / question.

Change the fuel pump



Keep 'em Flyin',

Dan Payne

Owner, Pilot, A&P-IA

(423)-544-8946

Volunteer Aero Service

Dallas Bay Skypark

1824 E Crabtree Road

Hixson, TN 37343

"Where Airworthiness Means Business!"



On May 29, 2015, at 1:19 AM, Dan Payne <dantpayne(at)icloud.com (dantpayne(at)icloud.com)> wrote:

[quote]Ps....if you throw fuel to it mid-flight and it burst back to life...I would suspect a worn out engine driven pump..



Keep 'em Flyin',

Dan Payne

Owner, Pilot, A&P-IA

(423)-544-8946

Volunteer Aero

Dallas Bay Skypark

1824 E Crabtree Road

Hixson, TN 37343

"Where Airworthiness Means Business!"



On May 29, 2015, at 1:01 AM, Bill Geipel <l129bs(at)gmail.com (l129bs(at)gmail.com)> wrote:

 	  Quote: 	
		  Adjust my what?? v-a-l-v-e-s? Like consonants?

You do many annuals? You must be â€œrich"

Iâ€™m not â€œrichâ€, no nothing about radials, why should I, we have guys like you that are willing to do it while we lounge by the pool, fly, camp, hike, bike, fly some more etc.So everyone gets what they want. 

I see your company name says â€œVolunteerâ€ well, donâ€™t. Problem for you, solved.

Shot mine, NOT bullet proof. 

Keep smiling.

Bill Geipel

Owner, pilot, not A&P-IA

canâ€™t afford cell phone.

On May 29, 2015, at 1:00 PM, Dan Payne <dantpayne(at)icloud.com (dantpayne(at)icloud.com)> wrote:

 	  Quote: 	
		  P.S.:

Why don't you all adjust your valves?? 

I do many annuals on "rich" people's airplanes who know nothing about Radials....

The engines are reliable. The airframes are bullet proof, and Denis Savarese is your go to guy on 4th & 10!



Keep 'em Flyin',

Dan Payne

Owner, Pilot, A&P-IA

(423)-544-8946

Volunteer Aero Services

Dallas Bay Skypark

1824 E Crabtree Road

Hixson, TN 37343

"Where Airworthiness Means Business!"



On May 28, 2015, at 11:46 PM, Dan Payne <dantpayne(at)icloud.com (dantpayne(at)icloud.com)> wrote:

 	  Quote: 	
		  Adjust the points/ breaker felts on the mags...





Let not forget the dwell timing / distributor advance in our GTOs we drove to high school...



Keep 'em Flyin',

Dan Payne

Owner, Pilot, A&P-IA

(423)-544-8946

Volunteer Aero Service

Dallas Bay Skypark

1824 E Crabtree Road

Hixson, TN 37343

"Where Airworthiness Means Business!"



On May 28, 2015, at 11:03 PM, migfighter42 <migfighter42(at)gmail.com (migfighter42(at)gmail.com)> wrote:

 	  Quote: 	
		  my experience with that problem is the same as Doc mentioned. the aircraft would run fine until warmed up, normally in flight, then dramatic misses. replaced the coils in the magnetos, the problem went away.

Bill

Sent from my T-Mobile 4G LTE Device



-------- Original message --------

From: Roger Kemp <f16viperdoc(at)me.com (f16viperdoc(at)me.com)> 

Date: 05/28/2015  8:47 PM  (GMT-06:00) 

To: yak-list(at)matronics.com (yak-list(at)matronics.com) 

Subject: Re: Engine roughness, as in stops. starts. stops. starts. 

--> Yak-List message posted by: Roger Kemp <f16viperdoc(at)me.com (f16viperdoc(at)me.com)>



Mag coil going bad will also do that. Typically occurs about 10 to 15 minutes of the flight.

Doc



Sent from my iPad



 	  Quote: 	
		   On May 28, 2015, at 6:55 PM, JL2A <info(at)flyingwarbirds.com.au (info(at)flyingwarbirds.com.au)> wrote:

 

 --> Yak-List message posted by: "JL2A" <info(at)flyingwarbirds.com.au (info(at)flyingwarbirds.com.au)>

 

 Hi all, my formation partner had a bit of engine trouble last time we flew then I took the same plane up for a shake down and got the same result -

 

 cruise power, 10 minutes into the flight, engine cuts abruptly, goes, cuts again, goes. Mixture full rich, carb heat on, didn't do it again but then these items were actioned after running fine for a few seconds.

 

 The cuts were hard, as in no power not just roughness, and only for a split second, but enough to get your attention.

 

 Speaking to two local CJ/Yak experts and they say it is likely the 'mid-range' mixture adjustment (I think the CJ book calls it 'cruise' mixture, same thing).

 

 Has anyone here experienced the same? Would be curious as to what an earth is going on, intermittent failures are the worst!

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=442717#442717

 

 

 

 http://www.matronics.com/Navig==========================p;             -===========================nbsp;                     -Matt Dralle, List Admin.<==========================


	


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ist"">http://www.matronics.com/Navigator?Yak-List

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ot;">http://www.matronics.com/contribution

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[b]

richard.goode(at)russiana
Guest

Posted: Thu May 28, 2015 11:56 pm Post subject: Engine roughness, as in stops. starts. stops. starts.

Without any doubt the problem will be a magneto coil - we have experienced

this on at least 30 aircraft over the last 25 years! The important point is

that it is related to engine temperature, so only becomes apparent after

15/25 minutes of flight. If you then land and allow the engine to cool, the

problem will disappear. But, it will get steadily worse.



One aspect that I have never understood is that the engine will cut

completely, usually only for a second or so but still very alarming, and it

does not seem to run on the other magneto for that brief period!



This is why, when we overhaul magnetos we then test them in a

high-temperature box (well in excess of operating temperatures) for an hour

to make sure that this problem will not happen.



Richard Goode Aerobatics

Rhodds Farm

Lyonshall

Hereford

HR5 3LW



Tel:  +44 (0) 1544 340120

Fax: +44 (0) 1544 340129

www.russianaeros.com



--

JL2A

Joined: 07 Apr 2015
Posts: 113
Location: Australia

Posted: Fri May 29, 2015 4:40 am Post subject: Re: Engine roughness, as in stops. starts. stops. starts.

Hi all, thanks for the on and off list replies. Very greatly appreciated believe me, the owner has delivered the aircraft to the mechanics and they were starting with their belief it is the mixture setting.



He has been informed and will be starting with new magneto coils instead now though!



I had a points spring break on one mag once, so it killed the mag completely and I do remember an attention-grabbing splutter and then the engine continued sounding more or less normal (was at low power on base). Strange how one mag dropping off seems to momentarily affect the other...



PS how good are forums! no way we would have got this analysis so quick anytime before, and while some of it dubious, absolutely no different to riding around to a different mechanics/pilots hangar and asking their opinion

migfighter42(at)gmail.com
Guest

Posted: Fri May 29, 2015 5:44 am Post subject: Engine roughness, as in stops. starts. stops. starts.

If its the fuel pump, you should see it on the fuel pressure gauge. 

if it is the valve train, that should be a problem noticed at all times, a loss of perforce irrespective of time and temperature.

If it is always happening after a certain period of time in flight everytime, its coil related. We had this exact problem a year ago, took us forever to find it. Dennis and Jill finally got us on the right path. 

Good luck.

Bill

Sent from my T-Mobile 4G LTE Device



-------- Original message --------

From: Dan Payne <dantpayne(at)icloud.com> 

Date: 05/29/2015  12:28 AM  (GMT-06:00) 

To: yak-list(at)matronics.com 

Subject: Re: Yak-List: Engine roughness, as in stops. starts. stops. starts. 

However..."engine cuts abruptly, goes, cuts again, goes. Mixture full rich, carb heat on, didn't do it again but then these items were actioned after running fine for a few seconds."

If you went full rich, then turned on the carb heat (making the mixture even more rich) that's answers you own dilemma / question.

Change the fuel pump



Keep 'em Flyin',

Dan Payne

Owner, Pilot, A&P-IA

(423)-544-8946

Volunteer Aero Service

Dallas Bay Skypark

1824 E Crabtree Road

Hixson, TN 37343

"Where Airworthiness Means Business!"



On May 29, 2015, at 1:19 AM, Dan Payne <dantpayne(at)icloud.com (dantpayne(at)icloud.com)> wrote:

[quote]Ps....if you throw fuel to it mid-flight and it burst back to life...I would suspect a worn out engine driven pump...



Keep 'em Flyin',

Dan Payne

Owner, Pilot, A&P-IA

(423)-544-8946

Volunteer Aero

Dallas Bay Skypark

1824 E Crabtree Road

Hixson, TN 37343

"Where Airworthiness Means Business!"



On May 29, 2015, at 1:01 AM, Bill Geipel <l129bs(at)gmail.com (l129bs(at)gmail.com)> wrote:

 	  Quote: 	
		  Adjust my what?? v-a-l-v-e-s? Like consonants?

You do many annuals? You must be â€œrich"

Iâ€™m not â€œrichâ€, no nothing about radials, why should I, we have guys like you that are willing to do it while we lounge by the pool, fly, camp, hike, bike, fly some more etc.So everyone gets what they want. 

I see your company name says â€œVolunteerâ€ well, donâ€™t. Problem for you, solved.

Shot mine, NOT bullet proof. 

Keep smiling.

Bill Geipel

Owner, pilot, not A&P-IA

canâ€™t afford cell phone.

On May 29, 2015, at 1:00 PM, Dan Payne <dantpayne(at)icloud.com (dantpayne(at)icloud.com)> wrote:

 	  Quote: 	
		  P.S.:

Why don't you all adjust your valves?? 

I do many annuals on "rich" people's airplanes who know nothing about Radials....

The engines are reliable. The airframes are bullet proof, and Denis Savarese is your go to guy on 4th & 10!



Keep 'em Flyin',

Dan Payne

Owner, Pilot, A&P-IA

(423)-544-8946

Volunteer Aero Services

Dallas Bay Skypark

1824 E Crabtree Road

Hixson, TN 37343

"Where Airworthiness Means Business!"



On May 28, 2015, at 11:46 PM, Dan Payne <dantpayne(at)icloud.com (dantpayne(at)icloud.com)> wrote:

 	  Quote: 	
		  Adjust the points/ breaker felts on the mags...





Let not forget the dwell timing / distributor advance in our GTOs we drove to high school...



Keep 'em Flyin',

Dan Payne

Owner, Pilot, A&P-IA

(423)-544-8946

Volunteer Aero Service

Dallas Bay Skypark

1824 E Crabtree Road

Hixson, TN 37343

"Where Airworthiness Means Business!"



On May 28, 2015, at 11:03 PM, migfighter42 <migfighter42(at)gmail.com (migfighter42(at)gmail.com)> wrote:

 	  Quote: 	
		  my experience with that problem is the same as Doc mentioned. the aircraft would run fine until warmed up, normally in flight, then dramatic misses. replaced the coils in the magnetos, the problem went away.

Bill

Sent from my T-Mobile 4G LTE Device



-------- Original message --------

From: Roger Kemp <f16viperdoc(at)me.com (f16viperdoc(at)me.com)> 

Date: 05/28/2015  8:47 PM  (GMT-06:00) 

To: yak-list(at)matronics.com (yak-list(at)matronics.com) 

Subject: Re: Yak-List: Engine roughness, as in stops. starts. stops. starts. 

--> Yak-List message posted by: Roger Kemp <f16viperdoc(at)me.com (f16viperdoc(at)me.com)>



Mag coil going bad will also do that. Typically occurs about 10 to 15 minutes of the flight.

Doc



Sent from my iPad



 	  Quote: 	
		   On May 28, 2015, at 6:55 PM, JL2A <info(at)flyingwarbirds.com.au (info(at)flyingwarbirds.com.au)> wrote:

 

 --> Yak-List message posted by: "JL2A" <info(at)flyingwarbirds.com.au (info(at)flyingwarbirds.com.au)>

 

 Hi all, my formation partner had a bit of engine trouble last time we flew then I took the same plane up for a shake down and got the same result -

 

 cruise power, 10 minutes into the flight, engine cuts abruptly, goes, cuts again, goes. Mixture full rich, carb heat on, didn't do it again but then these items were actioned after running fine for a few seconds.

 

 The cuts were hard, as in no power not just roughness, and only for a split second, but enough to get your attention.

 

 Speaking to two local CJ/Yak experts and they say it is likely the 'mid-range' mixture adjustment (I think the CJ book calls it 'cruise' mixture, same thing).

 

 Has anyone here experienced the same? Would be curious as to what an earth is going on, intermittent failures are the worst!

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=442717#442717

 

 

 

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[b]

Ernie

Joined: 11 Jan 2006
Posts: 513

Posted: Fri May 29, 2015 5:55 am Post subject: Engine roughness, as in stops. starts. stops. starts.

Quick question.



Wouldn't a coil problem only manifest itself on 1 side? A complete loss of 1 Mag shouldn't cause an abrupt and complete loss of power should it?

Ernie

On Fri, May 29, 2015 at 9:43 AM, migfighter42 <migfighter42(at)gmail.com (migfighter42(at)gmail.com)> wrote:

[quote]If its the fuel pump, you should see it on the fuel pressure gauge.Â 

if it is the valve train, that should be a problem noticed at all times, a loss of perforce irrespective of time and temperature.

If it is always happening after a certain period of time in flight everytime, its coil related. We had this exact problem a year ago, took us forever to find it. Dennis and Jill finally got us on the right path.Â 

Good luck.

Bill

Sent from my T-Mobile 4G LTE Device



-------- Original message --------

From: Dan Payne <dantpayne(at)icloud.com (dantpayne(at)icloud.com)> 

Date: 05/29/2015  12:28 AM  (GMT-06:00) 

To: yak-list(at)matronics.com (yak-list(at)matronics.com) 

Subject: Re: Yak-List: Engine roughness, as in stops. starts. stops. starts. 

However..."engine cuts abruptly, goes, cuts again, goes. Mixture full rich, carb heat on, didn't do it again but then these items were actioned after running fine for a few seconds."

If you went full rich, then turned on the carb heat (making the mixture even more rich) that's answers you own dilemma / question.

Change the fuel pump



Keep 'em Flyin',

Dan Payne

Owner, Pilot, A&P-IA

[url=tel:%28423%29-544-8946](423)-544-8946[/url]

Volunteer Aero Service

Dallas Bay Skypark

1824 E Crabtree Road

Hixson, TN 37343

"Where Airworthiness Means Business!"



On May 29, 2015, at 1:19 AM, Dan Payne <dantpayne(at)icloud.com (dantpayne(at)icloud.com)> wrote:

 	  Quote: 	
		  Ps....if you throw fuel to it mid-flight and it burst back to life...I would suspect a worn out engine driven pump...



Keep 'em Flyin',

Dan Payne

Owner, Pilot, A&P-IA

[url=tel:%28423%29-544-8946](423)-544-8946[/url]

Volunteer Aero

Dallas Bay Skypark

1824 E Crabtree Road

Hixson, TN 37343

"Where Airworthiness Means Business!"



On May 29, 2015, at 1:01 AM, Bill Geipel <l129bs(at)gmail.com (l129bs(at)gmail.com)> wrote:

 	  Quote: 	
		  Adjust my what?? v-a-l-v-e-s? Like consonants?

You do many annuals? You must be â€œrich"

Iâ€™m not â€œrichâ€, no nothing about radials, why should I, we have guys like you that are willing to do it while we lounge by the pool, fly, camp, hike, bike, fly some more etc.So everyone gets what they want.Â 

I see your company name says â€œVolunteerâ€ well, donâ€™t. Problem for you, solved.

Shot mine, NOT bullet proof.Â 

Keep smiling.

Bill Geipel

Owner, pilot, not A&P-IA

canâ€™t afford cell phone.

On May 29, 2015, at 1:00 PM, Dan Payne <dantpayne(at)icloud.com (dantpayne(at)icloud.com)> wrote:



 	  Quote: 	
		  P.S.:

Why don't you all adjust your valves??Â 

I do many annuals on "rich" people's airplanes who know nothing about Radials....

The engines are reliable. The airframes are bullet proof, and Denis Savarese is your go to guy on 4th & 10!



Keep 'em Flyin',

Dan Payne

Owner, Pilot, A&P-IA

[url=tel:%28423%29-544-8946](423)-544-8946[/url]

Volunteer Aero Services

Dallas Bay Skypark

1824 E Crabtree Road

Hixson, TN 37343

"Where Airworthiness Means Business!"



On May 28, 2015, at 11:46 PM, Dan Payne <dantpayne(at)icloud.com (dantpayne(at)icloud.com)> wrote:

 	  Quote: 	
		  Adjust the points/ breaker felts on the mags...





Let not forget the dwell timing / distributor advance in our GTOs we drove to high school...



Keep 'em Flyin',

Dan Payne

Owner, Pilot, A&P-IA

[url=tel:%28423%29-544-8946](423)-544-8946[/url]

Volunteer Aero Service

Dallas Bay Skypark

1824 E Crabtree Road

Hixson, TN 37343

"Where Airworthiness Means Business!"



On May 28, 2015, at 11:03 PM, migfighter42 <migfighter42(at)gmail.com (migfighter42(at)gmail.com)> wrote:

 	  Quote: 	
		  my experience with that problem is the same as Doc mentioned. the aircraft would run fine until warmed up, normally in flight, then dramatic misses. replaced the coils in the magnetos, the problem went away.

Bill

Sent from my T-Mobile 4G LTE Device



-------- Original message --------

From: Roger Kemp <f16viperdoc(at)me.com (f16viperdoc(at)me.com)> 

Date: 05/28/2015  8:47 PM  (GMT-06:00) 

To: yak-list(at)matronics.com (yak-list(at)matronics.com) 

Subject: Re: Engine roughness, as in stops. starts. stops. starts. 

--> Yak-List message posted by: Roger Kemp <f16viperdoc(at)me.com (f16viperdoc(at)me.com)>



Mag coil going bad will also do that. Typically occurs about 10 to 15 minutes of the flight.

Doc



Sent from my iPad



 	  Quote: 	
		   On May 28, 2015, at 6:55 PM, JL2A <info(at)flyingwarbirds.com.au (info(at)flyingwarbirds.com.au)> wrote:

 

 --> Yak-List message posted by: "JL2A" <info(at)flyingwarbirds.com.au (info(at)flyingwarbirds.com.au)>

 

 Hi all, my formation partner had a bit of engine trouble last time we flew then I took the same plane up for a shake down and got the same result -

 

 cruise power, 10 minutes into the flight, engine cuts abruptly, goes, cuts again, goes. Mixture full rich, carb heat on, didn't do it again but then these items were actioned after running fine for a few seconds.

 

 The cuts were hard, as in no power not just roughness, and only for a split second, but enough to get your attention.

 

 Speaking to two local CJ/Yak experts and they say it is likely the 'mid-range' mixture adjustment (I think the CJ book calls it 'cruise' mixture, same thing).

 

 Has anyone here experienced the same? Would be curious as to what an earth is going on, intermittent failures are the worst!

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=442717#442717

 

 

 

 http://www.matronics.com/Navig==========================p;Â Â Â Â Â Â Â Â Â Â Â Â  -===========================nbsp;Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â  -Matt Dralle, List Admin.<==========================


	


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[b]

richard.goode(at)russiana
Guest

Posted: Fri May 29, 2015 6:15 am Post subject: Engine roughness, as in stops. starts. stops. starts.

That is what one would assume, and I have no explanation for the fact that the coil beginning to break down in one magneto will cause rough running and indeed stopping, but it definitely does!

 

Richard Goode Aerobatics

Rhodds Farm

Lyonshall

Hereford

HR5 3LW

 

Tel:Â  +44 (0) 1544 340120

Fax: +44 (0) 1544 340129

www.russianaeros.com

 

From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of Ernest Martinez

Sent: 29 May 2015 14:55

To: yak-list

Subject: Re: Engine roughness, as in stops. starts. stops. starts.



 

Quick question.

 



Wouldn't a coil problem only manifest itself on 1 side? A complete loss of 1 Mag shouldn't cause an abrupt and complete loss of power should it?



 



Ernie

 

On Fri, May 29, 2015 at 9:43 AM, migfighter42 <migfighter42(at)gmail.com (migfighter42(at)gmail.com)> wrote:

If its the fuel pump, you should see it on the fuel pressure gauge. 



 



if it is the valve train, that should be a problem noticed at all times, a loss of perforce irrespective of time and temperature.



 



If it is always happening after a certain period of time in flight everytime, its coil related. We had this exact problem a year ago, took us forever to find it. Dennis and Jill finally got us on the right path. 



 



Good luck.



 



Bill



 



 



 



Sent from my T-Mobile 4G LTE Device

-------- Original message --------

From: Dan Payne <dantpayne(at)icloud.com (dantpayne(at)icloud.com)> 

Date: 05/29/2015 12:28 AM (GMT-06:00) 

To: yak-list(at)matronics.com (yak-list(at)matronics.com) 

Subject: Re: Engine roughness, as in stops. starts. stops. starts. 

However..."engine cuts abruptly, goes, cuts again, goes. Mixture full rich, carb heat on, didn't do it again but then these items were actioned after running fine for a few seconds."



 



If you went full rich, then turned on the carb heat (making the mixture even more rich) that's answers you own dilemma / question.



 



Change the fuel pump

Keep 'em Flyin',

 

Dan Payne



Owner, Pilot, A&P-IA



[url=tel:%28423%29-544-8946](423)-544-8946[/url]



 



Volunteer Aero Service



Dallas Bay Skypark



1824 E Crabtree Road



Hixson, TN 37343



 



"Where Airworthiness Means Business!"



 





On May 29, 2015, at 1:19 AM, Dan Payne <dantpayne(at)icloud.com (dantpayne(at)icloud.com)> wrote:

 	  Quote: 	
		  

Ps....if you throw fuel to it mid-flight and it burst back to life...I would suspect a worn out engine driven pump...



Keep 'em Flyin',

 

Dan Payne



Owner, Pilot, A&P-IA



[url=tel:%28423%29-544-8946](423)-544-8946[/url]



 



Volunteer Aero



Dallas Bay Skypark



1824 E Crabtree Road



Hixson, TN 37343



 



"Where Airworthiness Means Business!"



 





On May 29, 2015, at 1:01 AM, Bill Geipel <l129bs(at)gmail.com (l129bs(at)gmail.com)> wrote:

 	  Quote: 	
		  

Adjust my what?? v-a-l-v-e-s? Like consonants?



 



You do many annuals? You must be â€œrich"



 



Iâ€™m not â€œrichâ€, no nothing about radials, why should I, we have guys like you that are willing to do it while we lounge by the pool, fly, camp, hike, bike, fly some more etc.

So everyone gets what they want. 



I see your company name says â€œVolunteerâ€ well, donâ€™t. Problem for you, solved.



Shot mine, NOT bullet proof. 



 



Keep smiling.



 



Bill Geipel



Owner, pilot, not A&P-IA



canâ€™t afford cell phone.



 

 

On May 29, 2015, at 1:00 PM, Dan Payne <dantpayne(at)icloud.com (dantpayne(at)icloud.com)> wrote:





P.S.:



 



Why don't you all adjust your valves?? 



 



I do many annuals on "rich" people's airplanes who know nothing about Radials....



 



The engines are reliable. The airframes are bullet proof, and Denis Savarese is your go to guy on 4th & 10!

Keep 'em Flyin',

 

Dan Payne



Owner, Pilot, A&P-IA



[url=tel:%28423%29-544-8946](423)-544-8946[/url]



 



Volunteer Aero Services



Dallas Bay Skypark



1824 E Crabtree Road



Hixson, TN 37343



 



"Where Airworthiness Means Business!"



 





On May 28, 2015, at 11:46 PM, Dan Payne <dantpayne(at)icloud.com (dantpayne(at)icloud.com)> wrote:

 	  Quote: 	
		  

Adjust the points/ breaker felts on the mags...



 



 



Let not forget the dwell timing / distributor advance in our GTOs we drove to high school...

Keep 'em Flyin',

 

Dan Payne



Owner, Pilot, A&P-IA



[url=tel:%28423%29-544-8946](423)-544-8946[/url]



 



Volunteer Aero Service



Dallas Bay Skypark



1824 E Crabtree Road



Hixson, TN 37343



 



"Where Airworthiness Means Business!"



 





On May 28, 2015, at 11:03 PM, migfighter42 <migfighter42(at)gmail.com (migfighter42(at)gmail.com)> wrote:

 	  Quote: 	
		  

my experience with that problem is the same as Doc mentioned. the aircraft would run fine until warmed up, normally in flight, then dramatic misses. replaced the coils in the magnetos, the problem went away.



 



Bill



 



 



 



Sent from my T-Mobile 4G LTE Device

-------- Original message --------

From: Roger Kemp <f16viperdoc(at)me.com (f16viperdoc(at)me.com)> 

Date: 05/28/2015 8:47 PM (GMT-06:00) 

To: yak-list(at)matronics.com (yak-list(at)matronics.com) 

Subject: Re: Engine roughness, as in stops. starts. stops. starts. 

--> Yak-List message posted by: Roger Kemp <f16viperdoc(at)me.com (f16viperdoc(at)me.com)>



Mag coil going bad will also do that. Typically occurs about 10 to 15 minutes of the flight.

Doc



Sent from my iPad



 	  Quote: 	
		   On May 28, 2015, at 6:55 PM, JL2A <info(at)flyingwarbirds.com.au (info(at)flyingwarbirds.com.au)> wrote:

 

 --> Yak-List message posted by: "JL2A" <info(at)flyingwarbirds.com.au (info(at)flyingwarbirds.com.au)>

 

 Hi all, my formation partner had a bit of engine trouble last time we flew then I took the same plane up for a shake down and got the same result -

 

 cruise power, 10 minutes into the flight, engine cuts abruptly, goes, cuts again, goes. Mixture full rich, carb heat on, didn't do it again but then these items were actioned after running fine for a few seconds.

 

 The cuts were hard, as in no power not just roughness, and only for a split second, but enough to get your attention.

 

 Speaking to two local CJ/Yak experts and they say it is likely the 'mid-range' mixture adjustment (I think the CJ book calls it 'cruise' mixture, same thing).

 

 Has anyone here experienced the same? Would be curious as to what an earth is going on, intermittent failures are the worst!

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=442717#442717

 

 

 

 http://www.matronics.com/Navig==========================p;             -===========================nbsp;                     -Matt Dralle, List Admin.<==========================


	


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-- 

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  [quote][b]

dsavarese0812(at)bellsout
Guest

Posted: Fri May 29, 2015 7:17 am Post subject: Engine roughness, as in stops. starts. stops. starts.

Yes, it does Ernie.  If you've never experienced a coil failure in one 

mag, I can tell you it WILL get your attention because if feels like the 

engine completely shuts down for one heartbeat, then picks back up again.



I was told by someone with a lot more life experiences than me that 

another older radial (can't remember if it was one of the small 

Continental's like was used on the Stearmanor Wright or Pratt)the 

engineers determined when the coil failed like being discussed here, the 

fuel charge through the supercharger (ie: fuel distribution point) is 

completely purged for one heartbeat causing the sensation of a complete 

shutdown for a few millisecondsand then recharged and the engine picks 

back up.  It's really weird. But I can tell you from many experiences, 

that's what it feels like.  Maybe someone onthe list can better define 

why it feels like a complete shutdown for a heartbeat.



FWIW, I have been able to duplicate the problem on the ground by heating 

up the engine to above about 250 degrees C as read on the CHT. As 

Richard Goode has stated, it definitely is a heat problem with the coil 

which typically occurs in the first 20-30 minutes of the flight. 

Repeating it on the ground is more difficult. But it can be done. If you 

can get the coil hot enoughon the ground, the engine will start to 

misfire. Once THAT occurs, you can isolate the problem to the left or 

right mag with the mag switch.



A. Dennis Savarese

334-546-8182 (mobile)

www.yak-52.com

Skype - Yakguy1



On 5/29/2015 8:54 AM, Ernest Martinez wrote:

 	  Quote: 	
		   Quick question.



 Wouldn't a coil problem only manifest itself on 1 side? A complete 

 loss of 1 Mag shouldn't cause an abrupt and complete loss of power 

 should it?



 Ernie



 On Fri, May 29, 2015 at 9:43 AM, migfighter42 <migfighter42(at)gmail.com 

 <mailto:migfighter42(at)gmail.com>> wrote:



     If its the fuel pump, you should see it on the fuel pressure gauge.



     if it is the valve train, that should be a problem noticed at all

     times, a loss of perforce irrespective of time and temperature.



     If it is always happening after a certain period of time in flight

     everytime, its coil related. We had this exact problem a year ago,

     took us forever to find it. Dennis and Jill finally got us on the

     right path.



     Good luck.



     Bill



     Sent from my T-Mobile 4G LTE Device

     -------- Original message --------

     From: Dan Payne <dantpayne(at)icloud.com <mailto:dantpayne(at)icloud.com>>

     Date: 05/29/2015 12:28 AM (GMT-06:00)

     To: yak-list(at)matronics.com <mailto:yak-list(at)matronics.com>

     Subject: Re: Engine roughness, as in stops. starts.

     stops. starts.



     However..."engine cuts abruptly, goes, cuts again, goes. Mixture

     full rich, carb heat on, didn't do it again but then these items

     were actioned after running fine for a few seconds."



     If you went full rich, then turned on the carb heat (making the

     mixture even more rich) that's answers you own dilemma / question.



     Change the fuel pump



     Keep 'em Flyin',



     Dan Payne

     Owner, Pilot, A&P-IA

     (423)-544-8946 <tel:%28423%29-544-8946>



     Volunteer Aero Service

     Dallas Bay Skypark

     1824 E Crabtree Road

     Hixson, TN 37343



     "Where Airworthiness Means Business!"

     On May 29, 2015, at 1:19 AM, Dan Payne <dantpayne(at)icloud.com

     <mailto:dantpayne(at)icloud.com>> wrote:



>     Ps....if you throw fuel to it mid-flight and it burst back to

>     life...I would suspect a worn out engine driven pump...

>

>     Keep 'em Flyin',

>

>     Dan Payne

>     Owner, Pilot, A&P-IA

>     (423)-544-8946 <tel:%28423%29-544-8946>

>

>     Volunteer Aero

>     Dallas Bay Skypark

>     1824 E Crabtree Road

>     Hixson, TN 37343

>

>     "Where Airworthiness Means Business!"

>     On May 29, 2015, at 1:01 AM, Bill Geipel <l129bs(at)gmail.com

>     <mailto:l129bs(at)gmail.com>> wrote:

>

>>     Adjust my what?? v-a-l-v-e-s? Like consonants?

>>

>>     You do many annuals? You must be â€œrich"

>>

>>     Iâ€™m not â€œrichâ€, no nothing about radials, why should I, we have

>>     guys like you that are willing to do it while we lounge by the

>>     pool, fly, camp, hike, bike, fly some more etc.

>>     So everyone gets what they want.

>>     I see your company name says â€œVolunteerâ€ well, donâ€™t. Problem

>>     for you, solved.

>>     Shot mine, NOT bullet proof.

>>

>>     Keep smiling.

>>

>>     Bill Geipel

>>     Owner, pilot, not A&P-IA

>>     canâ€™t afford cell phone.

>>

>>

>>     On May 29, 2015, at 1:00 PM, Dan Payne <dantpayne(at)icloud.com

>>     <mailto:dantpayne(at)icloud.com>> wrote:

>>

>>>     P.S.:

>>>

>>>     Why don't you all adjust your valves??

>>>

>>>     I do many annuals on "rich" people's airplanes who know nothing

>>>     about Radials....

>>>

>>>     The engines are reliable. The airframes are bullet proof, and

>>>     Denis Savarese is your go to guy on 4th & 10!

>>>

>>>     Keep 'em Flyin',

>>>

>>>     Dan Payne

>>>     Owner, Pilot, A&P-IA

>>>     (423)-544-8946 <tel:%28423%29-544-8946>

>>>

>>>     Volunteer Aero Services

>>>     Dallas Bay Skypark

>>>     1824 E Crabtree Road

>>>     Hixson, TN 37343

>>>

>>>     "Where Airworthiness Means Business!"

>>>

>>>

>>>     On May 28, 2015, at 11:46 PM, Dan Payne <dantpayne(at)icloud.com

>>>     <mailto:dantpayne(at)icloud.com>> wrote:

>>>

>>>>     Adjust the points/ breaker felts on the mags...

>>>>

>>>>

>>>>     Let not forget the dwell timing / distributor advance in our

>>>>     GTOs we drove to high school...

>>>>

>>>>     Keep 'em Flyin',

>>>>

>>>>     Dan Payne

>>>>     Owner, Pilot, A&P-IA

>>>>     (423)-544-8946 <tel:%28423%29-544-8946>

>>>>

>>>>     Volunteer Aero Service

>>>>     Dallas Bay Skypark

>>>>     1824 E Crabtree Road

>>>>     Hixson, TN 37343

>>>>

>>>>     "Where Airworthiness Means Business!"

>>>>

>>>>

>>>>     On May 28, 2015, at 11:03 PM, migfighter42

>>>>     <migfighter42(at)gmail.com <mailto:migfighter42(at)gmail.com>> wrote:

>>>>

>>>>>     my experience with that problem is the same as Doc mentioned.

>>>>>     the aircraft would run fine until warmed up, normally in

>>>>>     flight, then dramatic misses. replaced the coils in the

>>>>>     magnetos, the problem went away.

>>>>>

>>>>>     Bill

>>>>>

>>>>>

>>>>>

>>>>>     Sent from my T-Mobile 4G LTE Device

>>>>>     -------- Original message --------

>>>>>     From: Roger Kemp <f16viperdoc(at)me.com

>>>>>     <mailto:f16viperdoc(at)me.com>>

>>>>>     Date: 05/28/2015 8:47 PM (GMT-06:00)

>>>>>     To: yak-list(at)matronics.com <mailto:yak-list(at)matronics.com>

>>>>>     Subject: Re: Engine roughness, as in stops. starts.

>>>>>     stops. starts.

>>>>>

>>>>>     

>>>>>     <f16viperdoc(at)me.com <mailto:f16viperdoc(at)me.com>>

>>>>>

>>>>>     Mag coil going bad will also do that. Typically occurs about

>>>>>     10 to 15 minutes of the flight.

>>>>>     Doc

>>>>>

>>>>>     Sent from my iPad

>>>>>

>>>>>     > On May 28, 2015, at 6:55 PM, JL2A

>>>>>     <info(at)flyingwarbirds.com.au

>>>>>     <mailto:info(at)flyingwarbirds.com.au>> wrote:

>>>>>     >

>>>>>     > 

>>>>>     <info(at)flyingwarbirds.com.au <mailto:info(at)flyingwarbirds.com.au>>

>>>>>     >

>>>>>     > Hi all, my formation partner had a bit of engine trouble

>>>>>     last time we flew then I took the same plane up for a shake

>>>>>     down and got the same result -

>>>>>     >

>>>>>     > cruise power, 10 minutes into the flight, engine cuts

>>>>>     abruptly, goes, cuts again, goes. Mixture full rich, carb

>>>>>     heat on, didn't do it again but then these items were

>>>>>     actioned after running fine for a few seconds.

>>>>>     >

>>>>>     > The cuts were hard, as in no power not just roughness, and

>>>>>     only for a split second, but enough to get your attention.

>>>>>     >

>>>>>     > Speaking to two local CJ/Yak experts and they say it is

>>>>>     likely the 'mid-range' mixture adjustment (I think the CJ

>>>>>     book calls it 'cruise' mixture, same thing).

>>>>>     >

>>>>>     > Has anyone here experienced the same? Would be curious as

>>>>>     to what an earth is going on, intermittent failures are the

>>>>>     worst!

>>>>>     >

>>>>>     >

>>>>>     >

>>>>>     >

>>>>>     > Read this topic online here:

>>>>>     >

>>>>>     > http://forums.matronics.com/viewtopic.php?p=442717#442717

>>>>>     >

>>>>>     >

>>>>>     >

>>>>>     > http://www.matronics.com/Navig==========================p;

>>>>>     -===========================nbsp; -Matt Dralle, List

>>>>>     Admin.<==========================

>>>>>

>>>>>

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