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Thread: What Size Carb To Use
          
   
   

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  1. #3
    SBC's Avatar
    SBC
    SBC is offline CHR Member Visit my Photo Gallery
    Join Date
    Nov 2004
    Location
    Magnolia
    Car Year, Make, Model: 69 Chevy Nova 283 4-spd
    Posts
    443

    The 3456 is a constant - but darned if I know from where
    Man I had to think about that one for a while.

    one cubic foot = 12x12x12 = 1728 cubic inches per cubic foot.

    One would think that is the conversion factor needed but -

    At any given rpm only 1/2 the displacement is actually intake flow.
    so you have to divide the total flow by 2 before converting CIM to CFM.

    therefore -

    CIDxRPM/(12x12x12)2 = CIDxRPM/3456
    Last edited by SBC; 02-22-2007 at 04:08 PM.
    There is no limit to what a man can do . . . if he doesn't mind who gets the credit. (Ronald Reagan)

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