Once the fire goes out, (engine turned off), the exhaust system cools fairly quickly, but the mass of the engine remains hot, (180-200) for quite some time. I don't expect the engine to cool rapidly from a gentel draft of air going by it. What I want to help, are the light /soft materials and electronics, trapped in this hot enviornment. They WILL cool rapidly from a cool draft of air passing by them. They, unlike the iron and alum block, have a much lower critical temp at which damage can begin to occure. Extreme sustained high temps, cook all the rubber and plastics, that seal and insulate, as well as the hoses that carry fluids and vapors throughout the engine bay. That high spike in temp, over repeated cycles, may have an effect on the hood paint. These are my concerns and the issues I am trying to help.
Does the air flow in ... or out, ... at speed, ... has never been the main issue for me, in deciding how to approach the heat problem. I have been building NASCAR engines for over 18 years, so I've had knowledge of the air pressures at the base of the windshield, since the early 80's. ... It flows both ways, depending on the speed.
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