Quote:
Originally Posted by Clev
Judging by the success people have with warm air intakes in improving mileage, I'm not sure I'd want to decrease underhood temperatures. Sure, it's harder on the battery, but otherwise I think it'd only help.
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High underhood temperatures can destroy ignition coils, alternator diode packs, and any other electronic component that must dissipate its internally generated heat. It is good practice to lower underhood temperatures. As far as warm/hot intake air systems, using exhaust heat for this is a great way to lower underhood temperatures. You build a shroud around the exhaust and draw intake air from under the shroud as cfg83 has shown in his pic.