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Hot Rods 3x2 vs 2x2 on a 8ba engine

Discussion in 'The Hokey Ass Message Board' started by hot rust, Oct 30, 2016.

  1. hot rust
    Joined: Sep 18, 2007
    Posts: 677

    hot rust
    Member

    just curious i see alot of flatheads with 2 carbs verses 3 carbs, are the three carbs too much for the flatty? i would have thought that the set up would have ran off the center carb till you opened the others up therefore only utilizing the others at a higher rpm where as your using both carbs to run off of on a 2x2 set up. i know you jet them (2x2) to run efficiently in this manner but it would seem that a 3x2 set up would be more efficient and produce more power by being ran progressive. i'm putting together a 8ba 51 model with alum heads a 400 jr cam with a 3x2 set up(strombergs). any info on this set up would be helpful or just tell me i'm screwing up. thanks hot rust
     
  2. 19Eddy30
    Joined: Mar 27, 2011
    Posts: 998

    19Eddy30
    Member
    from VA

    I run 2x2 , straight, no progressive linkage , the slig shot by Edelbrock was to raise Rpm , but not so much as to add more CFM's I have read several places that Flathead where under CFM right from the Ford factory ,
    A 4x2 would be better then 3x2 There's more to why 2x2 & 4x2 over 3x2 , but honestly
    Me I would not know how to explain it in writhing, but you can see it on a dyno & with 6 egt's
    Pretty sure someone else will comment maybe they will have a better explanation, cap off and dummy center cab , run the end Carbs straight ,
     
    Last edited: Oct 30, 2016
  3. Ralph Moore
    Joined: May 1, 2007
    Posts: 650

    Ralph Moore
    Member

  4. Flathead Dave
    Joined: Mar 21, 2014
    Posts: 2,877

    Flathead Dave
    ALLIANCE MEMBER
    from So. Cal.

    Unless your flathead is built up, you only need one carb. Anything more is over kill. Most rodders add a second carb on a stock motor for looks and are nice to look at. If that is what you want then go for it.
    Mine is a stock motor and will stay this way so I have no need to for a duel or triple set up. I no longer street race but I do spin my rear tires once in a while.
     

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  5. 19Eddy30
    Joined: Mar 27, 2011
    Posts: 998

    19Eddy30
    Member
    from VA

    If you add another carb to a stock Flatty you will see & feel the difference in power and get up & go over the one carb, Or install a bigger carb overstock "" CFMs""
     
  6. Flathead Dave
    Joined: Mar 21, 2014
    Posts: 2,877

    Flathead Dave
    ALLIANCE MEMBER
    from So. Cal.

    Of course you will notice it. I don't disagree. It's not for me.
     
  7. Bandit Billy
    Joined: Sep 16, 2014
    Posts: 6,534

    Bandit Billy
    ALLIANCE MEMBER

  8. In high school I put 3X2 on my stock worn out 40 flatty. I don't think it would have mattered if I had 1,2,3,4,6. It was still a dog but it looked cool.
     
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  9. dan c
    Joined: Jan 30, 2012
    Posts: 2,093

    dan c
    Member

    a rough formula is to multiply your displacement by .75 and that is the cfm you are looking for.
     
  10. MBog
    Joined: May 2, 2006
    Posts: 552

    MBog
    Member

    I run 3 on my modified flattie. big difference. still get 20 mpg and will run 16s in the 1/4
     
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