I always understood it based on an article about the first cowl-hooded
muscle cars; The idea was that the as a car moves, there is a high pressure
point at the base of the windshield, resulting in denser air. The idea was
that as the intake pulled in air, it would be dense, cool air from outside
the engine compartment. When the car was at rest, heat also escaped from the
cowl. But the main idea was the cool, dense air.
Jason
95 900SS
00 Busa
99 Black R/C R/T
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