CFM for a 6.9
Elder User
Joined: Apr 2002
Posts: 950
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From: West Bend
Depends on the Volumetric efficiency really. Assuming you're talking N/A here, so at 100% VE and 3500RPM you're looking at 425.34CFM. However I would guess more typically the engines to probably run around 85-90% VE at best for N/A in which case you're looking at 361.55CFM at 85% VE and 382.81CFM at 90%VE. Turbocharged you can surpass 100% VE and will of course need more flow.
Short answer... yes I think 310CFM is a bit low
Short answer... yes I think 310CFM is a bit low
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Senior User
Joined: Oct 2009
Posts: 104
Likes: 0
From: spanaway,wa
Depends on the Volumetric efficiency really. Assuming you're talking N/A here, so at 100% VE and 3500RPM you're looking at 425.34CFM. However I would guess more typically the engines to probably run around 85-90% VE at best for N/A in which case you're looking at 361.55CFM at 85% VE and 382.81CFM at 90%VE. Turbocharged you can surpass 100% VE and will of course need more flow.
Short answer... yes I think 310CFM is a bit low
Short answer... yes I think 310CFM is a bit low
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