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Eric, et al;

It would appear the we have conventional wisdom going in two different
directions at once.  On one hand it is suggested that the TSIO 550 can be
safely run lean of peak so long as power is set at 65% or less.  In fact,
GAMI literature states that it is safe to run lean of peak under those
conditions.  On the other hand, it is suggested that the TSIO 550 should
NEVER be run lean of peak under any conditions.

When we ran GAMI's lean test to see if we needed their injectors we found
that fuel flow spread was less than .6 gph between first and last cylinders
to peak.  In fact, the engine runs very smoothly at 15 gph leaned from 65%
with EGTs within a couple of bars of the bottom of the VM1000 graph.

With EGTs that low where is the heat going to come from that will ruin the
engine?  If TCM has something definitive published on the subject I would
appreciate a reference.

Merrill Smith

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