Quote:
Originally Posted by TerrysSPF
The most effective "ram air" setups that I've seen come from a scoop in the REAR of the hood. I owned a 69 Z-28 as well as a 70 Chevelle SS. Both cars had very effective ram air set ups that drew cold air from the rear of the hood off of the windsheild and directly to the carb (that was surrounded by a rubber seal to a hole in the hood).
I've always had the belief that hood scoops that face the front of the car are for directing cooler air THROUGH the engine bay........not directly into the carb (although it passes by the carb on it's way out). The vents on the side of the engine bay (like on Cobra's and Corvettes) help pass the air as well.
Don't know how accurate I am but that has always been my thought on the subject.
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I'd say that your are mostly correct, the amount of effect a forward facing scoop has is dependent a lot on how the nose of the car is shaped. The plenum effect at the rear somewhat on the angle/shape of the windshield. The Boss 429s had an enormous scoop, waaay to big, Dyno Don, Barry Poole or one of the other Ford racers discovered that reversing the scoop actually made them faster (read; more power). I believe that the regular scoops and the shakers had a better effect because they were picking up boundry layer air on the surface of the hood, above a certain height it becomes turbulent, at least on those cars.