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Date: Mon, 09 Apr 2012 11:54:57 -0400
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Subject: Re: [LML] Engine "surge" issue
References: <list-5473453@logan.com>
From: Randylsnarr <randylsnarr@yahoo.com>
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Berni, 100 octane fuel boils at a very low temp. Fuel is boiling in the inje=
ction lines when the engine is hot when you are idling. When you are above i=
dle there is enough fuel traversing the fuel lines to keep them under the bo=
iling point which is why you only get this this at idle when the engine is h=
ot.=20

This was explained to me by don Rivera at airflow performance, he designed t=
he bendix injection system and is the guy who designed the airflow performan=
ce system as well so he knows what he is talking about. This same reason is r=
esponsible for the hot start issues in our fuel injection set ups.
This is normal...
Randy Snarr=20
N694RS


Sent from my iPad

On Apr 8, 2012, at 8:37 PM, Berni Breen <bbreen@cableone.net> wrote:

> Whenever my GAMI injected IO360 powered Lancair 360 is really heated up, f=
ollowing a flight and only a short time to cool down (less than 30 minutes) a=
nd restarted, the engine will surge during idle and taxi.  Again this only h=
appens when the engine is hot, has been shut down and restarted.  The issue n=
ever occurs when the airplane (engine) is started for the first time on any g=
iven day (super hot day or super cold day).
>=20
> Since I feel the issue is fuel related I tried leaning and use of the elec=
tronic fuel pump during idle and taxi with zero improvement.  The engine run=
s very badly with a pronounced surge.  If I get on the runway and give the e=
ngine full throttle, the engine will develop good power and lift off as if t=
here were no issue...that is until yesterday when the engine just about quit=
 2000' into my takeoff roll.  I aborted the takeoff, did some high speed tax=
iing and then took off 3 minutes later (no shutdown).
>=20
> Today I took off, climbed aggressively to get the engine good and hot and l=
anded.  I shutdown, let the engine sit for about 10 minutes, restarted and o=
nce again experienced the surge during idle and or taxiing.  I removed the u=
pper and lower cowl but am still not able to identify the cause of my issue.=

>=20
> Clearly I have an issue that is caused by heat affecting fuel.  All of my f=
uel lines are heat shielded.  Can anyone offer suggestions or ideas that I c=
an try?
>=20
> Berni