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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
+1 slow&rusty's post #4 and Brian's post #9.

Thick IC's upper sections heat the air and the lower section then becomes less effective unless it has a long run to overcome. Then long runs create pressure drop.

Getting the cooling air through the IC is also important. Look at the 993's. Porsche shrouded not only the IC but also the intake air as Brian is saying.

However, other design issues are relevant. Every thing between the turbo's exit and the throttle plate can effect pressure drop including transitions, bends, and end tank size and design. Actual core construction also has in effect.

However, in general more top surface area as slow&rusty notes it a plus.

Then the sizing of the core is best matched to the power range of the car. To big and air velocity will suffer unnecessarily, to small and there will be a bigger pressure drop than is desirable in the upper HP range.

Thus, a well designed half bay that is sized well for the motor might out perform a less than ideal full bay.

I like this one a lot:

An example of ducting the intake air so the intake only sees cool air and the IC gets as much of the cooling air flow as possible.

Last edited by 911st; 09-26-2010 at 08:07 AM..
Old 09-24-2010, 10:00 AM
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