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Tri Carb set up for a Flathead?

Discussion in 'The Hokey Ass Message Board' started by bagged63, Oct 14, 2012.

  1. bagged63
    Joined: Oct 14, 2012
    Posts: 7

    bagged63
    Member

    I am just beginning the rebuild of a 1941 Ford Flathead 24 bolt. i picked up a box of ford 94 carbs parts with 4 whole but slightly different carbs and a mess of parts off craigslist. My plan (loosely stated) is to rebuild three of them and pick up a three up intake off of ebay. So a couple of questions: 1) if each carb is a bit different can they still be joined on one manifold? 2) if so, is it true that the center carb is the master and the two outer carbs are slave? meaning is the center carb the only carb with a choke and jets and the other two are wide open and staged so they only work when the pedal is pushed beyond a certain point? (as a side note, is there a different rebuild kit for each of the 94's? according to model # stamped on the outside?) Thank you for any help as this is the first engine rebuild for me.
     
  2. carbking
    Joined: Dec 20, 2008
    Posts: 3,345

    carbking
    Member

    The two end carbs should be the same.

    It is common to use one of the carbs with the hand throttle for the center because of the extended throttle shaft. These would be 91-99, 21-29, or model 59.

    Commonly used carbs for the ends would be 8BA, EAB, or others without the extended throttle shaft, although the extended shaft carbs may also be used.

    This link may help:

    http://www.thecarburetorshop.com/Aftermarkettripowersetups.htm

    Jon.
     
    bagged63 likes this.
  3. mastergun1980
    Joined: Oct 18, 2010
    Posts: 1,095

    mastergun1980
    Member
    from Alva OK

    You can also pick up extended throttle shafts. In facy you can buy aluminum secondary throttle boddies ( which have no idel circuit and ar springload to ensure full closure... But some folks don't like aluminum bases. .. .
    I used y-block aa-1 carbs for my 3x2 set up ( think holley 94 with more cfm )
    [​IMG]
    I also used the vintage speed tri power kit... kinda pricey ... but comes with everything you need ( if you had fresh rebuilt carbs ) he can supply the rest of the rebuil parts.
     
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  4. uncle max
    Joined: Jan 19, 2006
    Posts: 906

    uncle max
    ALLIANCE MEMBER

    Is that an early log-manifold???
     
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  5. Ole don
    Joined: Dec 16, 2005
    Posts: 2,915

    Ole don
    Member

    Three carbs may be a bit much for a 41 engine without a longer stroke and maximum bore. A 41 engine with a decent bore will only make it a 248. A 276 or 286 can use three if it has plenty of cam.
     
    bagged63 likes this.
  6. mastergun1980
    Joined: Oct 18, 2010
    Posts: 1,095

    mastergun1980
    Member
    from Alva OK

    Yep the rearest of the rare! An orignal 2x4 - 3x2 ! Is this better lol
    [​IMG]
     
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  7. mastergun1980
    Joined: Oct 18, 2010
    Posts: 1,095

    mastergun1980
    Member
    from Alva OK

    this is why I am pretty much not allowed in the kitchen anymore!
     
    bagged63 likes this.
  8. Your end carbs will also need to have jets, there is no way to regulate the fuel delivered without them. Your end two carbs should also be secondary carbs specifically, which is to say that the throttle plates shoulod completely close off when the car is not being used, they normally will have thicker throttle plates which are shaped slightly differently, these can be purchased or you can send your carbs to be modified.

    Now that you are sufficiently shook up there are several people here on the HAMB that set up carbs for this function. Stick around a bit and find out who they are and see if they can hook you up.
     
    bagged63 likes this.
  9. Carb-Otto
    Joined: Feb 12, 2006
    Posts: 332

    Carb-Otto
    Member
    from FINkLAND

    Haha ha haa!!! :D
     
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  10. Bruce Lancaster
    Joined: Oct 9, 2001
    Posts: 21,682

    Bruce Lancaster
    Member Emeritus

    What model carbs do you have to start with? Model designations are cast on left side of bowl.
     
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  11. kingofthecrate
    Joined: Sep 25, 2012
    Posts: 49

    kingofthecrate
    Member

    Where can I buy the thicker throttle butterflys?
     
    bagged63 likes this.
  12. Speedway has them and Vintage speed also
     
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  13. 1pickup
    Joined: Feb 20, 2011
    Posts: 1,194

    1pickup
    Member

    If you're running a bone stock engine: use the 3X2 intake. rebuild the best carb of the bunch & put it in the center. cut some sheetmetal or aluminum plates to fit under your front & rear carbs, & put whichever ones look best out of the rest of your collection on the front & rear. A little fake plumbing to the front & rear, & you have a good looking set up that runs fine off of one carb. Fools damn near everyone, except those of us who have done it.
     
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  14. propwash
    Joined: Jul 25, 2005
    Posts: 3,858

    propwash
    Member
    from Las Vegas

    for a mild flattie of limited displacement (such as yours), just use 2x2 carbs and run them simultaneously using slightly smaller (orifice size) jets. Less complicated, less tricky to set up, and less cluttered in appearance. That's just my opinion - more than two carbs are better used on larger displacement high performance/racing engines that require that much air/fuel.

    dj
     
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  15. bagged63
    Joined: Oct 14, 2012
    Posts: 7

    bagged63
    Member

    Thank You everyone.
    I ended up getting a vintage fenton 2x2 from ebay and set it up with vintage speed bases and linkage.
    Sold the whole thing back on ebay for $850
    IMG_1075.jpg
     
  16. Well that's a m nice setup. The beer cans are a little lame but other then that its a nice setup.
     
    Automotive Stud likes this.
  17. BLAKE
    Joined: Aug 10, 2002
    Posts: 2,778

    BLAKE
    Member

    FWIW, I run three 97's on my 8BA with direct linkage... non-progressive... works just fine.
     
  18. bagged63
    Joined: Oct 14, 2012
    Posts: 7

    bagged63
    Member

    no one likes the pabst cans...lol
     

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