[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 charges 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?? Somebody needs to convince me otherwise. ;-)

Bob