Message-ID: <3AE70AD1.C3830329@progress.com>
Date: Wed, 25 Apr 2001 13:35:13 -0400
From: Marcelo Pacheco <pacheco@progress.com>
Organization: PROGRESS Software Professional Services
MIME-Version: 1.0
To: lancair.list@olsusa.com
Subject: Re: running lean of peak
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Reply-To: lancair.list@olsusa.com

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Robert,

When you lean the engine enough, you have exceess air act as a coolant, as
you're getting less air than needed. That's why peak temps are the no-no zone
for very high HP aircraft. I never read that fuel is a significant lubricant for
the engine. I would expect that partially burned fuel would actually be the
inverse of a lubricant.

What about the new turbo normalized system IO-550 that Tornado Alley from Ada,
OK is producing, which it's recommended operation mode is full throttle, full
rich for takeoff and climb, then lean for 15GPH for cruise, then adjust mixture
to obtain a certain EGT temp. There are very, very detailed articles on this
engine on www.avweb.com, including graphs of engine temps, you can get the
engine to produce up to 80% of rated power with very low temps but using
WOTLOPSOP (Wide open throttle, Lean of Peak, Standard operating Procedure).
Notice the lean for 15GPH thing, this is meant as a quick way to go from rich of
peak to lean of peak without leaving the engine close to peak for more than a
few seconds, that are is 

Sorry, I won't take the always run the engine rich of peak argument as a blanket
statement.

If you had a chance to question the aircraft owner to his specific practices in
far more detail than "we was running LOP because he has an engine monitor), then
we could get into a more meaningfull conclusion either way.

Marcelo Pacheco
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LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
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Please send your photos and drawings to marvkaye@olsusa.com.
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