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Date: Mon, 21 May 2012 16:30:57 -0400
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Subject: 360 still surging
From: Berni Breen <bbreen@cableone.net>
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Many of you guys have offered suggestions to help me remedy my ongoing
engine surge challenge.  As a reminder...my fuel injected IO360 displays a
very pronounced surge during idle and taxi following a flight and brief
shutdown/restart.  The problem never occurs when the engine iis cool.

I have tried suggestions such as ground running the engine at 1700 rpm for
extended periods following a restart in an attempt to get some air moving
through the cowl but that has resulted in limited success.  So far my only
remedy is to let the engine sit for a long enough period to let it cool
significantly.  If I do, I have zero issues with surging.

I even removed my fuel injector servo and sent it off for overhaul (not an
inexpensive undertaking) as another attempt to remedy my problem.  That
idea does not address what I firmly believe to be the problem, heat causing
fuel vapor lock, but I tried it anyway.  I reinstalled the servo yesterday
and test flew.  The plane performed flawlessly as it always does following
a first start.  When I returned home and let it sit for 20 minutes,
restarted and went to taxi, the surge was just as pronounced as ever.

All of my fuel lines are insulated and fire sleeved.  The only exposed
lines are the small lines that run up to the spider on the top of the
engine. I do not have any fuel leaks.  Turning on my electric fuel pump,
while increasing fuel pressure from 20 to 25 psi, does not remedy the surge
issue.

As posted here before I have taken the active and lifted off several times
with this surge issue going on as the surge quits once I apply full
throttle.  As several of you have pointed out this is not a safe way to
proceed therefore I am again asking for ideas/suggestions from you guys.

Many years ago in my drag racing days me and several of my friends would
install a cooling can to cool down the fuel and therefore (we believed)
helped us produce more power.  We would use a coffee can, insert a coil of
copper fuel line in the can, put this contraption in line (fuel line) fill
it and fill it with ice prior to a run.  While this is not a practical long
term solution, is this the kind of thing I should be doing to
prove/disprove my belief that I have a vapor lock issue?

I sincerely appreciate any and all suggestions!

Berni Breen
Lancair 360

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Many of you guys have offered suggestions to help me remedy my ongoing engi=
ne surge challenge. =A0As a reminder...my fuel injected IO360 displays a ve=
ry pronounced surge during idle and taxi following a flight and brief shutd=
own/restart. =A0The problem never occurs when the engine iis cool. =A0<div>


<br></div><div>I have tried suggestions such as ground running the engine a=
t 1700 rpm for extended periods following a restart in an attempt to get so=
me air moving through the cowl but that has resulted in limited success. =
=A0So far my only remedy is to let the engine sit for a long enough period =
to let it cool significantly. =A0If I do, I=A0<span>have zero issues with s=
urging.<span></span></span></div>


<div><span><br></span></div><div><span>I even removed my fuel injector serv=
o and sent it off for overhaul (not an inexpensive undertaking) as another =
attempt to remedy my problem. =A0That idea does not address what I firmly b=
elieve to be the problem, heat causing fuel vapor lock, but I tried it anyw=
ay. =A0I reinstalled the servo yesterday and test flew. =A0The plane perfor=
med flawlessly as it always does following a first start. =A0When I returne=
d home and let it sit for 20 minutes, restarted and went to taxi, the surge=
 was just as pronounced as ever.</span></div>


<div><span><br></span></div><div><span>All of my fuel lines are insulated a=
nd fire sleeved. =A0The only exposed lines are the small lines that run up =
to the spider on the top of the engine. I do not have any fuel leaks. =A0Tu=
rning on my electric fuel pump, while increasing fuel pressure from 20 to 2=
5 psi, does not remedy the surge issue.</span></div>


<div><span><br></span></div><div><span>As posted here before I have taken t=
he active and lifted off several times with this surge issue going on as th=
e surge quits once I apply full throttle. =A0As several of you have pointed=
 out this is not a safe way to proceed therefore I am again asking for idea=
s/suggestions from you guys.</span></div>


<div><span><br></span></div><div><span>Many years ago in my drag racing day=
s me and several of my friends would install a cooling can to cool down the=
 fuel and therefore (we believed) helped us produce more power. =A0We would=
 use a coffee can, insert a coil of copper fuel line in the can, put this c=
ontraption in line (fuel line) fill it and fill it with ice prior to a run.=
 =A0While this is not a practical long term solution, is this the kind of t=
hing I should be doing to prove/disprove my belief that I have a vapor lock=
 issue?</span></div>


<div><span><br></span></div><div><span>I sincerely appreciate any and all s=
uggestions!</span></div><div><span><br></span></div><div>
<span>Berni Breen</span></div><div><span>Lancair 360</span></div><div><span=
><br></span></div><div></div><div><br></div>

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