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Diff Between 2 Barrel vs 4 Barrel CFM Rating

Discussion in 'The Hokey Ass Message Board' started by One Finger John, Nov 2, 2010.

  1. One Finger John
    Joined: Mar 18, 2009
    Posts: 458

    One Finger John

    2 barrel carbs are rated differently than 4 barrel carbs. Something about the 2 barrels tested @ "twice the pressure drop". Could some one put this in easily understood language? I would like to know what the cfms of the Holley 350 & 500 2 barrels are in 4 barrel measurement.

    Thanks in advance, John
  2. landseaandair
    Joined: Feb 23, 2009
    Posts: 3,781

    from phoenix

  3. One Finger John
    Joined: Mar 18, 2009
    Posts: 458

    One Finger John

    BTT for the morning crew.
  4. Screamin' Metal
    Joined: Feb 1, 2009
    Posts: 506

    Screamin' Metal
    from Oklahoma

    Here Ya Go....
    Hope that helps.....

    Over at SpeedTalk, I believe it was a couple of months ago, several other Motor builders and myself were thrashing it out over there about the CFM ratings, the correct way to pick carbs and all....Its one of the biggest mistakes made in the HotRod and performance car industry. Everyone always thinks bigger is better, which isn't true.
    Sure, you can 'tune down' a carb to a specific amount of fuel to a certain amount of air....after that....your killing performance if the cfm is way off....
    Last edited: Nov 2, 2010
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  5. carbking
    Joined: Dec 20, 2008
    Posts: 1,670


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