question on boost and CFM

[m.malloy]

how much air will the 3.8l inhale if it's running N/A. also how does boost relate to cfm. basically how much cfm equals 1 psi of boost.. thank you.

[nova]

According to my calculations the 3.8L the airflow rates of the 3.8L are

50cfm @ 1000rpms
150cfm @ 3000rpms
275cfm @ 5500rpms

These are rough calculations based on a volumetric efficiency of 75%. I don't have the actual VE but 75% should be within +/-10%.

Under 1psi of boost the engine should draw approximately

54cfm @ 1000rpms
161cfm @ 3000rpms
294cfm @ 5500rpms

Hope this helps.

[Dominic]

At 6000 revs the 3800 will inhale between 350-400cfm of air. Our engine's VE is roughly 0.8 on average. I am interested in knowing what 1psi of boost would be on top of this though [img]smile.gif[/img]

[DEE97GTP]

You might find this useful.

http://www.smokemup.com/auto_math/airflow.php

DEE