12-07-2011, 10:17 AM
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CC Member
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Join Date: Jul 2005
Location: San Tan Valley,
AZ
Cobra Make, Engine:
Posts: 194
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Not Ranked
Quote:
Originally Posted by DAVID GAGNARD
Using Holley's formula for determining carb cfm requirements of a given engine (cubic inches X max rpms diveded by 3456) assuming a 6000 rpm redline, your engine would need 574.66 cfms of air, also, assuming 100% VE....Add in antoher 50 cfm so you don't max out the carb and you need 624.66 cfms of air, so a 650 double pumper would be perfect....you would have good idle vacum and good low end torque as well as enough carb to see it through the rpm range......
a lot of times when it comes to carbs,bigger is not better.....
David
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I used to use that formula, with pretty much the same result.
Then I found out the motor made more power with a 780. |
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