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The other day I was using my OBD-2 scanner and found out that my car's intake has a peek flow of 25 lbs/min. I converted this to ~317 cubic feet (at 5.5 deg C)

I then calculated the velocity in the 3.5" diameter intake to be ~36 feet/sec.

The intake has a 2" venturi orifice (sound muffler) and calculated the flow at this point to be ~64 feet/sec.

Here is where I am stuck. How do I calculate the pressure difference?

Thank you in advance!

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# Air Intake Pressure?

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