Bernoulli and 350 ft/s, 146 cfm/in²

67CBodyGuy said

If you can measure the temperature change in the air then you would know something about the density changes.

PV=nRT (ideal gas law)

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I agree. In theory the temperature rise through the port (on the flow bench) could be related directly to the inefficiency of the port. I don’t have the equipment or experience to do that however.