Intakes

[cannondale27]

I know Wistech and I dynoed a few lengths.Raising the throttlebody and we lost power everywhere I think.But we never had a formula found one so more investigation is needed.

Chrysler testing resulted in a formula to calculate where the ram effect will come into play. To wit: N x L = 84,000, where N represents the desired engine rpm to tune for and L is the length in inches from the opening of the ram tube to the valve head. Shope explains: "Let's say you're running at Bonneville with an engine that develops peak horsepower at 8,400 rpm and want to tune for maximum ram effect at that level. Then, L should equal 10 inches, as in 8,400x10 inches = 84,000." To achieve ram tuning at 5,500 rpm, simply divide the constant, 84,000 by 5,500 rpm. The result of 84,000-5,500 = 15.27, the ideal distance for the intake tract as measured from the opening of the ram tube to the valve head.