I'm at the other end of this willy-measuring challenge. I can only muster a total of 479bhp out of a total of 29 pistons in 16 engines, so an average of a miserable 16bhp/cylinder.
"Best" of all is the Renault 4CV, which just about manages to wheeze out a total of 10bhp from its 4 cylinders. Even my chainsaws can do better than that!
