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BoxxerSix BoxxerSix is offline
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Join Date: Jun 2006
Location: Ballston Spa, NY
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Originally Posted by 125shifter View Post
As for front to back vs side by side, who knows? On front to back the air moves slower so it has more time to cool while a side to side has more velocity but each passage is longer so it has more surface area to exchange heat. ?!?!?!

With all dimensions equal, the side to side(left to right) type flowing core would have a bit more pressure drop than the front to back style flowing core that has the shorter core path. It's why liquid/air IC's have such little to near zero pressure drop as the air passages that the charge air flows over are very short(average 2-4" at most VS 10-24" for various air/air).

A simple HP to CFM formula is:

Wa = HP x A/F x (BSFC/60)

Wa = flow in lbs/min
HP = horsepower target(crank)
A/F = air fuel ratio
BSFC = brake specific fuel consumption....usually estimated around .6

Then just convert to CFM

V = (N x 10.73 x T) / (29 x P)

N= lbs/min
T = Temp degree Rankine.......or outside air temperature plus 460
P = psia
Adam Hennessy

Last edited by BoxxerSix; 06-16-2008 at 07:34 PM..
Old 06-16-2008, 07:22 PM
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