t.manua wrote:I've read that running the engine at peak EGT is not advisable, over a long term, since the cylinder head temperature is fairly high and can decrease the life expectancy of the engine. Is this part even simulated in the A2A 172?
Well, to this problem running the engine at 50 °F rich of peak would not be a solution: if anything, the cylinder head temperature is even higher, everything else being equal. Still, this doesn't mean that even if you ran the engine at 50 °F rich of peak, or at peak or wherever, the cylinder head temperatures are necessarily excessively high in absolute terms. At reduced power levels (limited either by the throttle reduction or by altitude), and with sufficient cooling airflow, the CHTs can remain reasonably low at these mixture settings too.
Piper_EEWL wrote:Yes but 100F ROP at 6000rpm shouldn't result in a full rich mixture I think!? I can't check right know but it sounds wrong. How do you lean for peak EGT? Are you allowing enough time for the EGT to stabilize?
I recall I've had difficulties to see much more than that of a drop in EGT by going full rich at low altitudes in A2A Comanche at least, running at high power levels. As if the full-rich wasn't that rich it ought to be. Anyways, this is actually something I might specifically test for once, to see if it is really so.
-Esa