[QUOTE=Itoldyouso]Yeah,
It's over my head, but he is the expert.

Well, maybe you can't make a direct comparison, but if not I don't understand why. If a four stroke engine of given displacement draws an intake charge every 720 degrees (1 stroke out of four) and the same displacement two stroke engine draws a charge every 360 degrees of rotation (1 stroke out of two), won't the two stroke be pumping twice the volume of air in a given time period?? An engine's nothing but an air pump. What am I missing??

Bob