Halfbaked, you've never had the pleasure of flying an overloaded, poorly cowled piston A/C on a hot day, have you? It's great fun trying to clear the mountain without frying the engines.
An interesting observation.
Years ago, I flew DC-6B aircraft from KLAS, in the summertime, average temp 45C.
Even though the engine cowls were of the pressurised NACA design, slightly faster climb speeds needed to be used, in order to keep cylinder and oil temperatures in check....not to mention the passenger cabin, with its assiciated ACM cooling (or lack thereof...
).