The bigger the bore and stroke lenth means more toque, but the engine will rev less due to the bigger bore and stroke lenth, partly because it takes energy to change a pistons direction. the bigger the piston, the heavyer it is, the more energy is used making it go back up. but what about wankle engines, since they only ever go one way, could you have a 5 litre wankle engine reving like a 2 stroke motorbike? (as in really high) the x2 power output aside, high torque AND high revs would make one sweet engine. right?