Quote: These cold air setups don't get above the boundry layer of air moving over the skin of the hood. So they have no effect on engine performance. You need to get above the boundry layer to get any noticeable effects.
The cowl induction hood uses the difference in pressure at the bottom of the windshield to get cold air effects. And the 69 A12 car's scoops just barely got into it.
Ryan
Who cares about a boundry layer when your grabbing cold air from the front side of the radiator support? Wish I had a picture but I don't. My .25 second improvement was from both COLD air AND RAM air at speed. And I think the Ram air had the bigger effect--due to the gluteus maximus dyno feeling once I reached about 70. But the dragstrip clock proved the performance increase...over and over.
If you don't mind the look, it can be very effective. The cowl induction setups I think would have a much lesser improvement
