>>28519949 (OP)
>burns too slow to utilise RPM
>all power must be made through torque instead
>therefore all the components of the driveline must be engineered to a higher torque threshold
>therefore it always ends up being far heavier than a Petrol engine of equivalent power
A crankshaft which spins to 10,000rpm doesn't actually need to be that heavy, on a balanced engine at least, but a crankshaft which can transmit 10,000nm of torque without snapping itself in half sure does.
