CFI1513840
Well Known Member
So far I have not been able to run LOP due to what I consider to be unacceptable engine roughness at LOP mixture settings. I typically see anywhere from .5 to.7 GPH GAMI spread when leaning. I was wondering if there could be any relationship between rated compression and LOP operations. Specifically, would mixture distribution be more critical in a higher compression engine? Or to put it another way, would an engine with 9:1 compression be more susceptable to roughness running LOP than an 8:5 engine, given the same mixture distribution? This is obviously just an uneducated, unfounded hunch on my part, but if it was true, for higher compression engines, the GAMI Spread might have to be less than the maximum suggested .5 GPH specified by GAMI for smooth operation.