Trick flow

Port volume is a static measurement. It's the volume of the port. The flow rate (measured in cubic feet per minute) factors time into the equation. Port volume means nothing, it's a marketing tool.

Port A: Cross sectional area of a pencil that's 100 miles long. Port volume 9 billion cc's.
Port B: You can fit your fist in and it's 8" long. Port volume 200 cc's.
Guess which one flows more cfm.