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M14PEngines-List Digest: 3 Msgs - 10/19/09

 
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brentblue(at)wyoming.com
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PostPosted: Tue Oct 20, 2009 5:40 am    Post subject: M14PEngines-List Digest: 3 Msgs - 10/19/09 Reply with quote

Quote:

Time: 05:22:27 AM PST US
From: "Brent Blue" <brentblue(at)wyoming.com>
Subject: Carb Problems
I have been unable to develop full power on a homebuilt with a
M14P. Can only
get fuel flow to about 16 gph (both static and high speed taxi) with
full rpm
and only 24 mp. Have checked the fuel supply and boost to the fine
screen and
get up to 50 gph with the boost pump to that point.

Is this a problem with pressurizing the carb and/or an aneroid
problem?

Thanks for any help.

Brent

Time: 06:14:39 AM PST US
From: "A. Dennis Savarese" <dsavarese0812(at)bellsouth.net>
Subject: Re: Carb Problems

Have you tried adjusting the prop governor and what type propeller
is on
the engine?
Dennis

Dennis:

The prop is the standard two blade Russian one. George Coy suggested
on the phone yesterday to check the governor which I will do this
weekend.

Thanks.

Brent
Quote:

Time: 06:42:52 AM PST US
From: "n801bh(at)netzero.com" <n801bh(at)netzero.com>
Subject: Re: Carb Problems

A few things to consider.
Have you comfirmed the fuel flow numbers are correct and transducer
is c
aliberated ?

Confirmed the RPM reading is correct? have ya used an optical tach
to te
st ?

I think you have the 360 HP motor as 24" is darn close to what you
would
see at DIJ's elevation, this seems to comfirm you don't have an intake
track restriction issue either.
If the motor is fresh and putting out 360 at sea level your 16 GPH
is no
t that far off. Up here your 360 is about 295 HP or so and 17-19 is
the
GPH numbers you should be seeing.
Ben Haas
N801BH
www.haaspowerair.com

Ben:

It should get a fuel flow of about 30 gph at full throttle with a MP
of about 32 to 34.

If you are around on Friday, come over to the west side and you can
see an engine run for yourself!

Thanks.

Brent


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dsavarese0812(at)bellsout
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PostPosted: Tue Oct 20, 2009 6:11 am    Post subject: M14PEngines-List Digest: 3 Msgs - 10/19/09 Reply with quote

That is where I was going with this as well.
Dennis
[quote] ---


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n801bh(at)netzero.com
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PostPosted: Tue Oct 20, 2009 6:41 am    Post subject: M14PEngines-List Digest: 3 Msgs - 10/19/09 Reply with quote

My mistake was thinking the 360 was naturally aspirated and the 400 was supercharged. I now see that both are supercharged and the 400 charger is slightly overdriven for more boost. What confused me was in the original post it said full rpm. I wonder why you didn't get 30" then.. A gear driven positive displacement blower should put out a given amount of boost at a given rpm. I am hoping to fly over Fri to see ya. Call me with a time... Seeya.

Ben Haas
N801BH
www.haaspowerair.com

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