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From: Luke Alcorn <alcornl@me.com>
Subject: RE: [LML] Engine "surge" issue


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I have a Lycon built IO-360 with 10:1 compression pistons and I have simil=
ar issues.  My engine does not surge and idle, but with stumble, pop and s=
putter, with the EGT's bouncing all over the place.  It does it shortly af=
ter touchdown on any day about 80 degrees, even after a nice long slow des=
cent and gently cooling the engine down from 10,000 feet.  If it sits to g=
et fuel and then restart anywhere up to 3 hours after shutdown, it will id=
le like crap, but when you put the throttle to it, above 1700 RPM is smoot=
hs out.

=20

I have been chasing this problem for 2 years.  I've wrapped the injector l=
ines in firesleeve, had my fuel servo rebuilt twice, the injectors, spider=
 and fuel servo flow matched, changed to colder REM37BY plugs, and I still=
 run into the same problems.  The only thing I can think of is that the ho=
t fuel between the gascolator and the lines running to the servo is gettin=
g turbulent in the lines, and not flowing properly through the spider and =
injectors, hence the EGT's jumping around.  Mixture and boost pump do noth=
ing.  I've rebuilt my mags, new ignition harness, intake gaskets (thinking=
 I had a leak), checked exhaust leaks, etc.  All of those changes and it r=
uns the exact same as the day I bought it.

=20

I now have a new issue of my #1 CHT going sky high on my initial climb out=
 when it never did before.  My CHT's run warm, like any close cowled engin=
e, but mine tries to go above 470 really fast, I have to level off and 500=
 to 1000 feet and bring the power back to 22 inches and let it cool down. =
 Then I can add full throttle and it is fine the rest of the climb.  That =
cylinder has the most airflow of any of them being in the right front. I b=
elieve this is fuel related as well.  As cruise my EGT's and CHT's and 20 =
to 30 degree spread.

=20

Any help would be appreciated as well.

=20

Luke Alcorn=EF=BB=BF=

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<html><body><div><font face="arial" size="2"><p style="margin:0;padding:0;margin: 0pt; padding: 0pt;">I
 have a  Lycon built IO-360 with 10:1 compression pistons and I have 
similar  issues.&nbsp; My engine does not surge and idle, but with stumble, 
pop and  sputter, with the EGT's bouncing all over the place.&nbsp; It does 
it shortly  after touchdown on any day about 80 degrees, even after a 
nice long  slow descent and gently cooling the engine down from 10,000 
feet.&nbsp; If it  sits to get fuel and then restart anywhere up to 3 hours 
after  shutdown, it will idle like crap, but when you put the throttle 
to it,  above 1700 RPM is smooths out.</p>
<p style="margin:0;padding:0;margin: 0pt; padding: 0pt;">&nbsp;</p>
<p style="margin:0;padding:0;margin: 0pt; padding: 0pt;">I have been 
chasing this problem for 2  years.&nbsp; I've wrapped the injector lines in 
firesleeve, had my fuel servo  rebuilt twice, the injectors, spider and 
fuel servo flow matched,  changed to colder REM37BY plugs, and I still 
run into the same  problems.&nbsp; The only thing I can think of is that the 
hot fuel between  the gascolator and the lines running to the servo is 
getting turbulent  in the lines, and not flowing properly through the 
spider and injectors,  hence the EGT's jumping around.&nbsp; Mixture and 
boost pump do nothing.&nbsp;  I've rebuilt my mags, new ignition harness, 
intake gaskets (thinking I  had a leak), checked exhaust leaks, etc.&nbsp; 
All of those changes and it  runs the exact same as the day I bought it.</p>
<p style="margin:0;padding:0;margin: 0pt; padding: 0pt;">&nbsp;</p>
<p style="margin:0;padding:0;margin: 0pt; padding: 0pt;">I now have a 
new issue of my #1 CHT going  sky high on my initial climb out when it 
never did before.&nbsp; My CHT's  run warm, like any close cowled engine, but
 mine tries to go above 470  really fast, I have to level off and 500 to
 1000 feet and bring the  power back to 22 inches and let it cool down.&nbsp;
 Then I can add full  throttle and it is fine the rest of the climb.&nbsp; 
That cylinder has the  most airflow of any of them being in the right 
front. I believe this is  fuel related as well.&nbsp; As cruise my EGT's and 
CHT's and 20 to 30 degree  spread.</p>
<p style="margin:0;padding:0;margin: 0pt; padding: 0pt;">&nbsp;</p>
<p style="margin:0;padding:0;margin: 0pt; padding: 0pt;">Any help would be appreciated as well.</p>
<p style="margin:0;padding:0;margin: 0pt; padding: 0pt;">&nbsp;</p>
<p style="margin:0;padding:0;margin: 0pt; padding: 0pt;">Luke Alcorn</p></font></div></body></html>

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