I am noticing some problems using 100LL,
I for one will be really happy when that stuff
goes away.  It doesn't even have to go away,
just wish more places had 80 or mogas.
--
Perry Mick

Perry, just out of curiosity what problems are you encountring using 100LL.
I have approx 160 hours using the stuff and have not noticed any problems
(yet).

Ed Anderson

It is similar to the effect of your plugs starting to go bad.  Basically
it's the same thing, fouled plugs.

I never burn 100LL when I'm just flying around the home base, so
never see the problem then.  I noticed it on my return flight from
Kansas last July, and again on my return flight from Phoenix on
Sunday.

When the engine is cold, first flight of the day, don't notice a
problem.  The problem seems to show when I'm taking off with
a warm engine, after a fuel stop. During the climbout the engine
will loose power, which gets my attention. RPM drops about 200
RPM, no big deal, still able to climb.  So I stay close to the airport
while climbing out. My theory is it's running only on the trailing
plugs and the leadings are fouled.  Oil and water temps quickly
rise 20 degrees higher than normal, probably due to the delayed
timing on the trailing plugs. I throttle back slightly to around 4500
for about 30 seconds, then slowly put the throttle back to full.
Then it recovers, and the temps return to normal amazingly fast.
That is it, everything is normal for the rest of the flight.

A neighbor flying a Midget Mustang with an antique engine, mixes
autogas with his 100LL to reduce spark plug fouling, on the advise
of other antique engine fliers.  He says antique engine guys have to
lean way back to avoid spark plug fouling.  So you and Tracy
probably have no problems because you can lean your engines.

I'm just going to try harder in the future to make fuel stops at
places that have Mogas or 80.

--
Perry Mick
Duckt N7XR
http://www.ductedfan.com

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