wrote:



...but it does bring up an interesting point. One that I have yet to see adequately explained anywhere. I've seen a
few engine operating curves that limit max manifold pressure as a function of RPM, there are many that don't. My fixed-pitch
Cherokee doesn't have the option, but I'd be interested to know any source that explains it adequately.


One of the absolute worst sources of information on how to properly run
an engine is the engine manufacturer. They are utterly uninterested in
proper engine management, only reducing liability and costs. For proper
engine operation you need to talk to the GAMI guys in Ada, OK. For
example Continental or Lyc will never tell you that the absolute worst
place to run your engine is 40 degrees rich of peak at any power
setting. Or that Continental flat out refuses to even discuss LOP
operations on any engine other than the 550. But install their
electronic engine controls and where do you think your engine is
running? Yep, LOP. We've all been taught that detonation is bad.
Turns out detonation is a trivial concern for our engines. GAMI has set
up an engine to detonate for days at a time of constant running. End
result? No damage whatsoever. Now preignition is a completely
different animal.


http://www.gami.com/frames.htm