Originally Posted by
Lead Balloon
Hi again oggers
When convenient:
You want to run an engine at 74% power. What mixture do you set, by reference to peak EGT?
Real world numbers please.
At what mixture do you maximise the risk of detonation, all other variables like RPM, timing and manifold pressure being equal?
A straight answer please.
You’re the one flying all the precious passengers around each day. You must be setting the mixture somewhere, and doing so to avoid detonation?
I set 100ROP because it gives me best power. Not all our aircraft have EDMs and as commercial operation we have to obey the SOP in the ops manual that is based on a single analogue instrument whose probe is mounted on the collector. Our SOP is min 75ROP. We do not have discretion to operate LOP and we are not equipped to anyway.
The mixture with the smallest detonation margin at any given power setting is peak EGT.