wow, this is the first question ive saw you ask nitro. you would think that more displacement would equal more torque and less rpms. but if you think about it a short stroke engine would crank out more rpms because the stroke of the piston is shorter, so that the piston on a shorter stroke engine wouldnt have to move as far for each stroke(gaining rpms but loosing torque). i think it has more to do with the overall displacement though.