David C wrote:
A point I like to think of is that 50 or 80 degrees
"from" "peak" on the rich side and on the lean side is, the same
temperature. For piston engines, running 50 deg lean of peak is the same
temp as running 50 deg rich of peak, so the valves are seeing the same temp - so
why are some engine "gurus" so adament about cruising 50 deg rich of
peak? It makes no sense to me.
So, I believe there is no such thing as "EGT too
high". There is only "peak EGT", whatever it is for your
installation.
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I ran EGT indicated over 1750 which is where Tracy
had the EM2 high limit set. When I told Tracy this, he was not concerned and
said set the limit to 1850.
The reason folks do not want you running within 50
degrees of peak on piston engines that many only have one EGT and the
distribution among cylinders is usually >50 degrees and therefore do not want
you running near peak, either over or under since there may well be a hot
one.
Bernie