| and really don't understand thermodynamics. Since there is always air flowing inside the plenum and it is colder than the air from the inside of the engine bay just outside of the plenum, the heat will try to transfer into the plenum from the engine bay. It's simply the way radiant heat functions. Now whether or not the plenum retains that heat is irrelevant, because that heat will never transfer out unless it is a cold enough day out for the ambient air in the engine bay to be colder than the intake charge going through the plenum. I don't see this as very likely. The only way to protect the air in the plenum from this heat is to make a plenum from a thermally resistant material like carbon. Aluminum versus chromed aluminum will not matter.
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