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Jerz Jerz is offline
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Join Date: Oct 2008
Location: AB, CANADA
Posts: 126
it would be good to talk to a pilot since they monitor their EGT's.
A turbocharged Lycoming 540 (6 cylinder 540 cu inch, 350hp) will peak at about 1650, but you are not suppose to operate there continuously. The usual practice is to set mixture 100F rich of peak, so at about 1550. That would be continuous 75% of power.

At full power you are at full rich mixture and lower EGTs.

AT 65% of power or less you can be 50-100F lean of peak. It is a factory approved setting and it worked for me, but many pilots and engineers feel its better to be on rich side of peak.

I don't have EGT in my Porsche yet and don't know how this translate to 930 engine. 1550F is getting up there. If you only running one probe, there is a chance the other cylinder is sitting at higher temp.

I had similar issue with pumped up Subaru engines I was playing with in the past. Advancing ignition at cruise sometimes all the way to 40 or 42 deg would fix that.
Old 06-23-2013, 07:27 AM
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