Quote:
Originally Posted by NoD~
I'm pretty curious about that myself. A black hood can hit 140-180*F (ballpark from what I could find online). In my instance, I don't have a way to plug in the block heater at work and hate jumping in a car that's 100* inside, but the engine is at 75*, lol
If I can find some materials laying around to make a proof of concept, I'd like to see what kind of in and out temps happen within X square foot.
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At speed, though, the wind will cool that hood. So it will be far below running temps. You preheating system will then be a massive cooling device. If it brings your temps low enough, even by just 15 degrees, you would begin to see fuel economy losses in engine operation, I think.