Thread: Carburator CFM
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01-16-2006 09:13 PM #1
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Carburator CFM
Can someone tell me how to choose how much carb. i need to look to buy for my engine? I'm under the impression that there is a formula to figure CFM...
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01-16-2006 09:31 PM #2
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Well according to my info, take the engine size say 460XMax rpm say5000XVolumetric efficiency divided by 3456= CFM. So460X5000=2300000X.85[most rebuilt engines have about 85% efficiency]=1955000 dividedby 3456=565.68287, or less than 600 CFM. This is only a place to start for some, but it has worked real well for me like it is.Choose your battles well===If it dont go chrome it
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01-16-2006 09:49 PM #3
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I like Denny's formula....cubic inches times 2.PLANET EARTH, INSANE ASYLUM FOR THE UNIVERSE.
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02-06-2006 09:33 AM #4
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From Offenhauser.I am just learning as I go.
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02-06-2006 11:49 AM #5
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IMHO, the Offy 360 is one of the best manifolds you can run on a SBC. I ran one on a basically stock 400 SBC in a '62 pickup. The only changes were an earlier double roller timing chain, an old Isky 30/30 cam, a 650 Holley DP and Hedman headers. It made good low end power and peter out until around 6 grand.Ken Thomas
NoT FaDe AwaY and the music didn't die
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Wild Willie & AA/FA's The greatest show in drag racing
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02-23-2006 07:50 AM #6
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You just made my head hurt.Originally posted by Ives Bradley
Well according to my info, take the engine size say 460XMax rpm say5000XVolumetric efficiency divided by 3456= CFM. So460X5000=2300000X.85[most rebuilt engines have about 85% efficiency]=1955000 dividedby 3456=565.68287, or less than 600 CFM. This is only a place to start for some, but it has worked real well for me like it is.
That's what I'm talking about...Originally posted by techinspector1
I like Denny's formula....cubic inches times 2.
Wes...aka "BigRed"
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