RE: Tapered-Bore Engine Break-in - Upgraded
Dar is right the fuel does a significant amount of cooling, more than the oil. But not all of the cooling is in the crankcase. Much of the fuel does not vaporise until it is in the cylinder. Also a rich mixture does not burn as hot as a lean one.
On the nitro funny cars and dragsters all of the cooling is from the fuel. They don't overheat unless they have a lean run. No oil involved in cooling other than by reducing friction.