Originally Posted by Craig

I theory a shorter stroke will give you more rpm at the same piston speed, which should raise the rpm corresponding to peak torque. However, I believe you also need to keep the bore/stroke ratio pretty square in a diesel. I guess that means you would have to go to more cylinders to get higher rpm from the same displacement engine. Does anyone know the specs on the audi tdi racing engine, I think it runs about 6000 rpm.