Reply:Huh? So if my engine is running at 2200 rpm and meeting the needs of the moment, it will make a difference in whether its pulling an airplane or a truck?
Strictly speaking, it does: The analogy would be that the engine in an airplane , is subjected to the same kind of loading as pulling a truck up a steady incline, constantly.
It is not simply the RPM that matters, it is the BMEP developed. You can be be turning the engine at 2200 in neutral, 2200 going up a steep hill or 2200 going downhill. It's clear that it won't be subject to the same strain under all three conditions, even if the RPM's are the same.
A good reason to set up the engine to be a "towing" engine as far as cams and valves are concerned.