Well, maybe if you could take an empirical measurement somehow. You might
be calculating till the cows come home if you try and get an exact
mathematical formula. If you could hook up some kind of graduated (non
resistive) piston to the intake side of the cylinder (outside of the head) and
rotate the crank 1 time to see how much air it sucked in, I suppose that would
at least put you in the ballpark. It'd be basic math beyond that...
Shaun H.
---original message---
Shaun,
Excellent thought and a rightous one at that! If a 360 Cu in motor was a
360 cu in air pump, @ 5500 rpm it would "push" 1145 cfm. This isnt the case
for an engine, but with some massive assumptions you can make an argument
for 900-950 CFM air requirement @ Standard temp and pressure for a highly
modified engine. The maximum "air" is based on the ignition timing, cam
profile, compression ratio, head port configuration etc. and is not an easy
theoretical # to come up with. Hense the "experimental method". (the 380
HP crate motor (360 cu in) is dynoed with a 750cfm Holly carb or so I
think..)
BKB
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