""a low pressure area created by the prop near the hub""

well I am sure this is true "near the hub", but as long as the cylinder stays cool,,,er, it "the cylinder" will pull the heat out of the crack case, and the fresh oil/fuel/air mixture interring the engine will also help cool the lower end of a 2 stroke,,


""this part about thinking the propwash will provide a cooling air flow is incorrect"",,

I cannot agree,, I think a more correct statement would be that the average flyer would be surprised to see how little airflow an engine needs to keep it at a good running temperature, many times I have had my hands behind running engines/props, you can not tell me a prop alone will not cool an engine, a prop creates much more airflow than a flywheel-fan on a weedeater, ,, I have often put my hand behind my running weedeater and noticed "how little airflow there was yet there is so much heat being removed,,

I will agree our engines do get more cooling in flight, , but fact is, most engine damage to our engines comes in flight from tuning too lean,,

I can say I have broken-in my MVVS and my 180 4stroker on the bench and for some reason they remand cool with only a prop to create airflow over the engine,, and, how many pilots have we all seen starting and run their engines on the ground "in" their planes for quite a long time and these engines do not over heat and become damaged,, and, I am quite sure our well made plane engines have a tighter cylinder tolerances than our old air cooled dirtbike engines of the 70..