In all that I have read on LOP operations, I have never found an answer as to why the onset of roughness seems to occur later (deeper LOP) when you are running at a higher RPM for any given power setting.
For example: 65% power, 2300 RPM: I can only run 30° LOP, but at 2500 RPM I can run 75° LOP.
Logic tells me this should be the opposite, since leaner mixtures burn slower, and you should be able to extract more energy from the burning fuel air mixture in the cylinder if it has a longer time to spend inside the cylinder pushing against the piston. Can anyone speak authoritatively on the subject?
For example: 65% power, 2300 RPM: I can only run 30° LOP, but at 2500 RPM I can run 75° LOP.
Logic tells me this should be the opposite, since leaner mixtures burn slower, and you should be able to extract more energy from the burning fuel air mixture in the cylinder if it has a longer time to spend inside the cylinder pushing against the piston. Can anyone speak authoritatively on the subject?