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To:  lml@lancaironline.net
Date: Sun, 29 May 2011 16:47:41 -0400
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Subject: Fuel restriction or air part 3
From: Berni <bbreen@cableone.net>
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Today while test flying my normally aspirated Lancair IV following my latest=
 attempt to correct my engine surging problem I noted the following:

At full throttle on the runway I saw 26.2 GPH fuel flow.  As I climbed out I=
 observed that the fuel flow was steadily dropping with no change in my WOT s=
etting.  I climbed out to 8,500 where my fuel flow had dropped to approximat=
ely 14 GPH and the engine was running very poorly.  Not only was I getting a=
 surge, the engine was very nearly ready to quit altogether even when I turn=
ed on the electric fuel pump.  I nosed over as I was deciding where to put d=
own and as I decended The engine began to run much better and I noted that t=
he fuel flow was increasing.  Even with a now smoothly running engine I felt=
 the best plan was to get back on the ground ASAP but did not experience any=
 engine issues on the way back in.

As a result of today's events I believe I should be looking exclusively for w=
hatever would cause my engine's reduction of fuel flow as I increase altitud=
e.  Much like a carbureated automobile engine would loose power when being d=
riven from sea level to high altitude (into mountains) I believe my engine i=
s being injected with fuel that is too rich.  I don't know if that conclusio=
n makes any sense?

Could my problem be the unit to which my throttle and mixture controls are c=
onnected?  On my IO540 this is located on the front bottom of the engine.  I=
s this a rebuildable unit? If so where can I send it to be rebuilt?

Sent from my iPad
Berni Breen
Bbreen@cableone.net=