Register now to get rid of these ads!

Technical Ford Model B carb

Discussion in 'Traditional Hot Rods' started by tomdoodle, Apr 25, 2014.

  1. tomdoodle
    Joined: Dec 28, 2012
    Posts: 8

    tomdoodle
    Member

    I am playing around with a 30 Ford Vicky. Someone changed from the original A carb to a model B. Can anyone tell me some starting settings for this carb? All info will be greatly appreciated. Thanks!
     
  2. ydopen
    Joined: Mar 14, 2010
    Posts: 206

    ydopen
    Member

    every model A is different. Try 1 turn on the GAV under the dash and 1 1/2 turns on the idle mix screw.It should start.

    John
     
  3. Bruce Lancaster
    Joined: Oct 9, 2001
    Posts: 21,682

    Bruce Lancaster
    Member Emeritus

    Some operational stuff...the choke is used briefly for starting, usually even when warm just to get some gas over the hump since there is not a mechanical accel pump. Choke snaps back off on its own as warmup enrichment is handled by screwing out the GAV using the choke knob. Unlike A, the B carb is generally right for running once warmed up with GAV screwed all the way out...A is meant to run with it slightly open.
     
  4. tomdoodle
    Joined: Dec 28, 2012
    Posts: 8

    tomdoodle
    Member

    How about the main jet? Is 4 to 4 1/2 turns open about right?
     

  5. adavis
    Joined: Oct 13, 2006
    Posts: 528

    adavis
    Member

    I don't know if you're a member, but you would probably have better luck with this question over on The Ford Barn.
     
  6. The supplier that is most knowledgeable about Model B carburetors is rennerscorner.com, (734) 428-8424. You might keep this number in mind if you need parts or information.

    Charlie Stephens
     
  7. George Miller
    Joined: Dec 26, 2008
    Posts: 413

    George Miller
    Member
    from NC usa

    You should have the main jet 1 turn open to start when cold. when it is warm 1/4 turn open. Idle jet start out at 1=1/2 turns. Each car is different so you have to play with your car to get it just right.
     
  8. Bruce Lancaster
    Joined: Oct 9, 2001
    Posts: 21,682

    Bruce Lancaster
    Member Emeritus

    A carbs are made to run right when warmed and at reasonable altitudes at 1/4 turn open on the GAV, after being open more to suit engine during the warmup. B carbs are jetted to run with GAV closed after warmup. As with idle screw, final settings are to suit your engine, but if much off likely the adjustment is covering for a problem elsewhere, like crud in the secret passages in casting or bad repro jets.
     

Share This Page

Register now to get rid of these ads!

Archive

Copyright © 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Terms of Service. Privacy Policy.

Atomic Industry
Forum software by XenForo™ ©2010-2014 XenForo Ltd.