Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Too small scoop opening?
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Old 09-27-2008, 08:18 AM
oldred oldred is offline
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Actually if you do a bit of research you will find that a low hood mounted scoop is useless as far as ram effect. All those fancy scoops used in the 60's were nothing more than looks and unless a scoop is extended well above the hood (I remember reading somewhere that it should be a minimum of 14" but that would depend on hood shape) it can actually be counter-productive due to a pressure drop from the air flow over the hood. Since the air does not flow on the surface of the hood but separates at the front and flows several inches above it there can actually be a pressure DROP at the front of the scoop due to "Bernoulli's principle" thus instead of the scoop being functional in producing ram air it can have the opposite of the desired effect. The auto engineers of the 60's were well aware that the scoops used on such cars as Mach one Mustangs and the like were just for show and GM even went so far as to address this problem with the "Cowl induction" design for taking air from the BACK of the hood! Most low mounted hood scoops will do a much better job of creating LOWER pressure at the scoop opening than they would at creating a ram effect.
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