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Posted for N295VV@aol.com:

Marcello writes:

(condensed)
"What about the new turbo normalized system IO-550 that Tornado Alley...
<snip> then lean for 15GPH for cruise..."

The word "new" is operative here.  How many of these engines are in the
air, and how many total flying hours do they have?

When they have half a hundred engines flying with a 1700 hours each without
burned up cylinders,  we should give their technique serious
consideration.

If they cannot substantiate it because of lesser numbers, I would not want
to be their test pilot contributing my dollars to prove their theory.

I run rich based on the advice of the guru of Bonanzas, who said you can
buy gasoline or cylinders--your choice.

Leaning may be acceptable and wonderful 99% of the time.  It is that one
instance where some cockpit distraction interferes with the thought
process, and some error creeps in, such as descending without enriching,
and your entire gasoline savings will evaporate in one minute of
intense heat rise.

If we were flying the Pipers or Cessnas in which we had enough cooling to
allow for such errors, we would be ok.  But the Lancair is pushed to the
edge of the envelope on cooling.  One little mistwist of that knob,
and your engine is groaning, hammering, slamming, stomping  and
moaning.  It just told you that you spent a minimum of nine thousand bucks.

David Jones
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