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pressure on the inlet side, and atmosphere at the other. This intercooler will flow more than 600 cfm if the pressure at the inlet is 10 psi and the outlet pressure is at 9 psi. This is why Bell Intercoolers lists their flow at 10 psi, because it is a more realistic pressure at which to rate flow. Reduce that flow to 600 cfm, and the pressure drop across the intercooler is reduced below one psi if the inlet and outlet pressures remain the same. I agree that cfm is a fairly useless metric for engine performance. I believe that "pressure drop will increase as the same volume of air is moved at higher pressure" is an incorrect statement. This is the formula I have been using for basic comparisons:
Pressure Drop = 7.57 x Air Volume Flow1.85 x Length of Pipe x (104 / Inside Diameter of Pipe5 x Initial Pressure (the 1.85, 4 and 5 are exponents, but you see the initial pressure in the denominator and this is a fairly common formula)
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