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Technical Holley 2100 on banger engine

Discussion in 'Traditional Hot Rods' started by Okie46chevy, Jan 29, 2023.

  1. Okie46chevy
    Joined: Feb 14, 2021
    Posts: 36

    from Edmond

    Got a 30 coupe with a banger engine. Recently got a Burns downdraft intake and have a Holley 2100 laying in the garage. Anyone use 2100 on ford banger engine? How did it do? Will be using factory gravity feed fuel system.
  2. '29 Gizmo
    Joined: Nov 6, 2022
    Posts: 257

    '29 Gizmo
    from UK

    A gravity system may not work. The reason for the original updraught carb is to get it low enough to get a head of pressure for the feed.
  3. Pete1
    Joined: Aug 23, 2004
    Posts: 2,146

    from Wa.

    I used 2 of them on a fabricated manifold once and it really worked good. I had a fuelpump though. 2 CARB MANIFOLD.png
  4. tubman
    Joined: May 16, 2007
    Posts: 6,413


    I don't see why it wouldn't work. I have a gravity feed fuel system on my engine test stand and I've run flatheads, Early Hemi's and Olds Rocket's on it with a 3" head. I have a hard time believing that a bunch of jets (about .050") in a venturi can pull more gas than atmospheric pressure can feed through a 3/8" fuel line.

    Try it; what do you have to lose? That's what we did back when we couldn't run to our computers and ask our friends.
    6sally6 and Okie46chevy like this.

  5. Glenn Thoreson
    Joined: Aug 13, 2010
    Posts: 617

    Glenn Thoreson
    from SW Wyoming

    The 2100 carb is basically the same as the old 94 carb minor mods. A lot of the 2100 models had an automatic choke. I think you could eliminate that by changing the top to an older model 94 top with manual choke. The innards on these is mostly the same as a 94. Some of these require an electric pump to avoid starvation issues, some don't.
    Okie46chevy likes this.
  6. Model A Gomez
    Joined: Aug 26, 2006
    Posts: 1,574

    Model A Gomez

    I ran a Holley 94 on my banger powered 30 Model A pickup and gravity feed for a while but had to keep the tank mostly full or it would starve if you went up hill. I finally put a fuel pump on it but the 2100 doesn't like much fuel pressure and you should run a pressure regulator.
    Okie46chevy likes this.
  7. Okie46chevy
    Joined: Feb 14, 2021
    Posts: 36

    from Edmond

    Recommend someone to rebuild it? Rather have it gone thru right before I start messing it up lol
  8. 51504bat
    Joined: May 22, 2010
    Posts: 4,026


    Maybe this guy over on the HAMB to rebuild the carb?

    Edit: Make that the Ford Barn not here on the HAMB
    Last edited: Jan 30, 2023
  9. Kevin Pharis
    Joined: Aug 22, 2020
    Posts: 414

    Kevin Pharis

    Gravity feed carbs need a larger float valve orifice than a pressure fed carb. Road angle and fuel level also have a big impact on fuel supply… we’ve all heard the stories about T’s backing up hillso_O Could always put a air pump on the tank to stabilize fuel supply…
  10. I just started rebuilding 94's and 97's. Soda blast then ultrasonic clean and parts from Charlie's
  11. carbking
    Joined: Dec 20, 2008
    Posts: 3,498


    IF one uses original factory calibrated parts:

    The Stromberg type EE-1 (Ford version 97) likes 3.0 psi fuel pressure at idle. (Orifice 0.098 inch).
    The Holley type 2100 likes 4.5 psi fuel pressure at idle. (Orifice 0.082 inch).

    Note the difference in pressures and orifice sizes.

    As to gravity versus pressure fuel feed:

    1928 4 cylinder Chevrolet (gravity) used a fuel orifice of 0.140 inch
    1971 Pontiac 455 HO (pressure) used a fuel orifice of 0.135 inch

    Use non-factory sizes, and one becomes one's own engineer.

    winduptoy likes this.

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