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Low RPM

 
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john.pearson757



Joined: 03 Oct 2013
Posts: 5

PostPosted: Fri Oct 04, 2013 11:08 am    Post subject: Low RPM Reply with quote

I was getting only 90% RPM and for other reasons, changed engines on my Skybolt.
I'm still getting 90% at best, more like 87 or 88%.
The carb is different and is rebuilt by Jill at M-14P.com so that can't be the problem. The mag timing is spot on and checked and re-checked. The blade angle is finer that standard. All linkages and travel have been checked. The tach is accurate and actual RPM has been checked.
When I reach full RPM, there is still quite a bit of throttle left so I guess I'm just pouring more fuel into the mix.
If anyone has suggestions or advice, thanks.
J.P.


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dsavarese0812(at)bellsout
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PostPosted: Fri Oct 04, 2013 11:30 am    Post subject: Low RPM Reply with quote

Do I understand you correctly? Same prop? Different engine? What prop
is on the airplane? If an MT 3 blade prop, does the prop governor have
the correct spring in it for the MT prop? Do check with MT regarding
the correct spring for the prop governor.

You said all linkages and travel have been checked. Have you verified
the carburetor throttle arm is at WOT when the throttle cable is pushed
fully forward? Do this by removing the throttle linkage from the
carburetor throttle arm, move the throttle arm on the carb to WOT. Now
hold the throttle linkage next to the throttle arm and then see where
the linkage is positioned with the throttle fully forward.

A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1

On 10/4/2013 2:08 PM, john.pearson757 wrote:
Quote:


I was getting only 90% RPM and for other reasons, changed engines on my Skybolt.
I'm still getting 90% at best, more like 87 or 88%.
The carb is different and is rebuilt by Jill at M-14P.com so that can't be the problem. The mag timing is spot on and checked and re-checked. The blade angle is finer that standard. All linkages and travel have been checked. The tach is accurate and actual RPM has been checked.
When I reach full RPM, there is still quite a bit of throttle left so I guess I'm just pouring more fuel into the mix.
If anyone has suggestions or advice, thanks.
J.P.


Read this topic online here:

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GeorgeCoy



Joined: 02 Dec 2010
Posts: 308

PostPosted: Fri Oct 04, 2013 11:41 am    Post subject: Low RPM Reply with quote

Is the governor arm moving to the stop? Have you re adjusted the stop?

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john.pearson757



Joined: 03 Oct 2013
Posts: 5

PostPosted: Fri Oct 04, 2013 12:00 pm    Post subject: Re: Low RPM Reply with quote

Thanks for the reply.
The prop is a 2 blade V530 - different governors. It is going to the stop.
I think the throttle is OK. When I reach 87%, I can push the throttle forward quite a bit more.


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dsavarese0812(at)bellsout
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PostPosted: Fri Oct 04, 2013 12:19 pm    Post subject: Low RPM Reply with quote

Was the prop governor swapped from the old engine to the new engine?
Dennis


From: George Coy <george.coy(at)gmail.com>
To: m14pengines-list(at)matronics.com
Sent: Friday, October 4, 2013 2:39 PM
Subject: RE: Low RPM


--> M14PEngines-List message posted by: "George Coy" <george.coy(at)gmail.com (george.coy(at)gmail.com)>

Is the governor arm moving to the stop? Have you re adjusted the stop?

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john.pearson757



Joined: 03 Oct 2013
Posts: 5

PostPosted: Fri Oct 04, 2013 12:24 pm    Post subject: Re: Low RPM Reply with quote

No, the governor wasn't swapped - new or different governor and I've played with the stops with no result.
J.P.


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dsavarese0812(at)bellsout
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PostPosted: Fri Oct 04, 2013 12:26 pm    Post subject: Low RPM Reply with quote

Look at the things that are common to both engines since the symptom has not changed when you changed the engine.
- Prop
- Throttle Cable

What did you set the blade angles to on the V530? ie: How many degrees and at what reference point on the blades?

The throttle cable sleeve might be slipping.  If it slips at all, you will not get full throw at the carburetor.  That could be why you feel like you can push it further with no increase in RPM. Check to see if the sleeve is moving anywhere from the throttle lever through the firewall and then to the carburetor.

Do you have a fuel flow instrument in the airplane? If so, what is the fuel flow at WOT on take off? Normal for an M14P 360HP engine is between 37 and 41 gallons per hour.
Dennis


From: john.pearson757 <ssvpearson(at)hotmail.com>
To: m14pengines-list(at)matronics.com
Sent: Friday, October 4, 2013 3:00 PM
Subject: Re: Low RPM


--> M14PEngines-List message posted by: "john.pearson757" <ssvpearson(at)hotmail.com (ssvpearson(at)hotmail.com)>

Thanks for the reply.
The prop is a 2 blade V530 - different governors. It is going to the stop.
I think the throttle is OK. When I reach 87%, I can push the throttle forward quite a bit more.


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john.pearson757



Joined: 03 Oct 2013
Posts: 5

PostPosted: Fri Oct 04, 2013 12:37 pm    Post subject: Re: Low RPM Reply with quote

Thanks Dennis,
I'll double check all those things. I agree, it has to be something like that.
J.P.


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mark.bitterlich(at)navy.m
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PostPosted: Mon Oct 07, 2013 7:19 am    Post subject: Low RPM Reply with quote

When you have everything wide open... pushed to the firewall, and you take the aircraft into a dive leaving everything wide open... and I am talking a steep dive here, does the RPM go up, or does it stay governed at 88%?

Note: If you are not developing enough power to take the engine to 100% due to fuel flow, carburetion issues, or throttle cable sleeve clamping, then in a dive the engine RPM will increase and go to the maximum setting that the governor will regulate. In other words, RPM will go up.

If you are in the dive, and the engine RPM stays close to exactly the same, then you've got a prop governor issue, or possibly blade angle.

I defer to Dennis on all engine issues, but this test might be of some help.

Mark
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jrpearson(at)brant.net
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PostPosted: Wed Oct 09, 2013 3:06 pm    Post subject: Low RPM Reply with quote

Thanks Mark,
I think I've narrowed it down to the governor linkage.
J.P.

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dsavarese0812(at)bellsout
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PostPosted: Thu Oct 10, 2013 5:11 am    Post subject: Low RPM Reply with quote

J.P.,
Linkage? Since you said it was a different governor on this engine and the symptom was the same on the older engine, what "linkage" are you talking about?   Possibly the cable SLEEVE moving in one or more of the cable clamps?  I've seen this several times.
Dennis


From: "jrpearson(at)brant.net" <jrpearson(at)brant.net>
To: m14pengines-list(at)matronics.com
Sent: Wednesday, October 9, 2013 6:06 PM
Subject: RE: Re: Low RPM


--> M14PEngines-List message posted by: jrpearson(at)brant.net (jrpearson(at)brant.net)
Thanks Mark,
I think I've narrowed it down to the governor linkage.
J.P.

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john.pearson757



Joined: 03 Oct 2013
Posts: 5

PostPosted: Mon Oct 28, 2013 2:17 pm    Post subject: Re: Low RPM Reply with quote

Thanks to all who provided advice. I revisited the linkage and that was the problem.
Thanks again,
J.P.


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