One of my compressors has bore 4" stroke 3-1/2" two cylinders (single stage) and can run at 900 rpm max.
I am trying to figure the displacement CFM and I'm coming up with an astonishing and quite unrealistic 45.8 CFM.
I think the actual number is more like 14 to 18. But I can't see what I'm doing wrong.
Help!
3.14 * 2^2 * 3.5 * 2 / 12^3 * 900 = 45.82-ish