ORIGINAL: SGC
"How can an engine have more stroke without increasing the distance from the crank-pin center to the center of the crankshaft? I have two engines that have the same crankshaft yet one is supposed to have 1.6mm more stroke".
OK, this CAN be true, if they are talking about effective compression stroke which not the actual crankshaft stroke, but the stroke of the piston after the ports are closed (this term is only used when talking about 2st's).
Stewart
Stewart,
When most people seek a way to 'stroke' an engine, they are looking for more swept displacement and more power.
When you 'drop the sleeve' and increase the effective stroke, you are also making the timing numbers more modest; less intake and exhaust duration, and the engine will be easier to operate, but with less output.
It may have more low-end torque, however.
I believe this is not what Brian had in mind, when raising this question.