[chillsworld]

Originally Posted by ijames

Apparently it was worth several mph on the P51 fighter back in WWII, enough that they studied and optimized the effect. On a car at 55 mph, who knows :-).

Originally Posted by Old Tele man

If you have enough heat differential, the answer is "yes," otherwise it's "no."

Originally Posted by freebeard

I, for one, am not saying that. All your examples point up, countering lift, not back like the P-51, countering drag.

If you want an example of high-efficiency internal cooling, look to the Edison2. The intake (or exhaust, I forget) is a thin belt around the widest circumference of the body—where the air is moving the fastest.

Well, there are very few engines under legal driving stresses that I would see having enough heat to even come close to this accomplishment. It would be fun to try though