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Good catch- I had a 2 where a 3 should have been. I fixed it.

No, Internal combustion engines are air pumps at their core. Each stroke of a piston can only suck so much air. The numbers I listed above assume perfect flow, which is unattainable, but what we use to help size systems (exceptions include injectors, then we really do need the volumetric...

Non turbo has same cfm through entire rpm range unlike gasoline engines. Assuming 100% volumetric efficiency, 218cfm at 2000 and 328 at 3000. .11 cfm per rpm