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Technical Carb Position on Mock Up

Discussion in 'Traditional Hot Rods' started by LSR 2909, Sep 16, 2019.

  1. LSR 2909
    Joined: May 10, 2012
    Posts: 607

    LSR 2909
    Member
    from Colorado

    I know I want my carb as level as possible but, is there any acceptable tolerance?
    Mine is leaning forward @ 2 degrees.
    I would rather not raise the front of the engine, if I didn't have to.

    MY APOLOGIES
    I should have been more specific the first time around.
    This is a Ford flathead with a torque tube rear end
     
    Last edited: Sep 16, 2019
  2. Dooley
    Joined: May 29, 2002
    Posts: 2,733

    Dooley
    Member
    from Buffalo NY

    Can you lower the trans some?
     
  3. flamedabone
    Joined: Aug 3, 2001
    Posts: 4,945

    flamedabone
    Member

    The general thinking is that if the engine runs downhill at about 3 degrees, your carb pad will be level, but you can't trust that 100%. Set your engine 3 degrees down and let the carb be where it is unless it is really crazy, like 10 degrees. Also, use a flat surface like the cylinder head gasket rail or a flat spot on the head or block, anything that is 90 degrees to the crank. Never trust the carb pad.

    Good luck, -Abone.
     
  4. mgtstumpy
    Joined: Jul 20, 2006
    Posts: 8,837

    mgtstumpy
    Member

    For a stock carb and base, it should be horizontal with rear of engine at approx 3 degrees down. Check you pinion up angle so that it corresponds and make sure body/frame is set up at ride height with any rake etc, save more issues later. Check that it's level lengthwise and width wise when installed. Correct setup allows the carb to sit level to keep the jets submerged as well as prevent fuel slosh into the engine. Last you want is a wedge to get the carb level like what was used in boats.
    Pinion.jpg
     
    Sporty45 and Boneyard51 like this.

  5. 41rodderz
    Joined: Sep 27, 2010
    Posts: 5,419

    41rodderz
    Member
    from Oregon

    You could also make a wedge spacer to tilt it back to level.
     
    Just Gary and Boneyard51 like this.
  6. Mimilan
    Joined: Jun 13, 2019
    Posts: 887

    Mimilan
    Member

    Why don't you tinker with the float level instead?
     
  7. mgtstumpy
    Joined: Jul 20, 2006
    Posts: 8,837

    mgtstumpy
    Member

    Having mismatched U-joint angles isn't a good idea, let alone float issues. Make the effort now and set it up correctly at mock up stage, that way you won't have to deal with other issues later when they emerge. They use angled spacers on roundy roundy to level engine side to side when it's under heavy load and cornering.
    Uni joint angle.jpg
     
    Sporty45 likes this.
  8. 2OLD2FAST
    Joined: Feb 3, 2010
    Posts: 3,370

    2OLD2FAST
    Member
    from illinois

    Yep we all know cars won't go up and down hills without fuel sloshing about and spilling. Must be why all the people in San Francisco walk and ride bicycles...and you can't drive up a mountain slope ....oh , that's right , this is the internet ...!!!
     
  9. Black_Sheep
    Joined: May 22, 2010
    Posts: 1,267

    Black_Sheep
    Member

    Never say never. Edelbrock used to publish engineering drawings of their intakes and quite often the carb pad was machined at an angle, presumably to compensate for how an engine sits in the chassis.
     
  10. mgtstumpy
    Joined: Jul 20, 2006
    Posts: 8,837

    mgtstumpy
    Member

    Depending on intake, carb pad angle ranges from 3 to 5 degrees. The intake angle locates the carb horizontal to compensate for the angle of the engine / transmission in the frame, that's all. In your case if it's 2 degrees off the horizontal and down at the front, the engine angle down at the rear is 1 to 3 degrees. A couple of degrees isn't the death of anything but why reinvent the wheel. Manufacturers spent $M on R&D, IMO why not take advantage of that. Plus you need angle for the universal joints to work correctly and prevent brinelling of the bearings. I've been in cars with strange harmonics attributable to poor set up issues.
     
    WB69 likes this.
  11. eicke
    Joined: Jul 30, 2012
    Posts: 63

    eicke
    Member

    Doesn't come into l
    Pinion angle doesn't come into play with a torque tube.

    Sent from my moto z3 using The H.A.M.B. mobile app
     

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