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Motorcraft 2150 Model ?

Discussion in 'Early CJ5 and CJ6 Tech' started by masscj2a, Apr 14, 2020.

  1. Apr 14, 2020
    masscj2a

    masscj2a Member 2023 Sponsor

    Ware, Mass
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    I see a lot of different Motorcraft 2150 carbs models out there. Not sure how different they are, but they are listing for different vehicles and Ford engines. So I guess what I'm getting to is, which one would you recommend for a stock Dauntless ??

    I would guess it comes down to jet sizes installed in the carbs and choke set ups and automatic tranny ?
     
  2. Apr 14, 2020
    masscj2a

    masscj2a Member 2023 Sponsor

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    I should also say, it's going on a 4 barrel intake, so I'd be asking if anyone makes an adapter for carb to intake or would I have to make one?
     
  3. Apr 15, 2020
    colojeepguy

    colojeepguy Colorado Springs

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  4. Apr 15, 2020
    wheelie

    wheelie beeg dummy 2024 Sponsor 2023 Sponsor

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    I bought a 2100 from a guy on eBay who was recommended by another member here. He wanted to know some specifics for my application and my elevation and set the carb up for me. All I had to do to it was hook up the pedal linkage and adjust that a little. it's been great so far but I haven't been wheeling with it yet.

    1.08 venturi is what everyone has recommended and what I went with.
     
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  5. Apr 15, 2020
    RATTYFLATTY

    RATTYFLATTY I think you need a little more throttle

    Central MN
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    I suggest a 2150 with the 1.08 venturi. It should have a electric choke and vacuum pulloff for it. I'm running this setup on my 225 which has an Offy 4V intake. When sourcing your adapter make sure it will seal to the base of the carb. The first one Colojeepguy listed is the type that could give you a vacuume leak on some 2150's due to the difference in the carb base at the rear. I'm at about 1200' here and I believe I have 47's or 48's in it for the main's.
     
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  6. Apr 15, 2020
    Norcal69

    Norcal69 Out of the box thinker 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    I personally would stay away from the 2150. I'm not saying that it is a bad carb, its just not as simple as the 2100. I have a 2100 on my jeep and a 2150 on Steve's 71.
    We both like the 2100 better. Atapters..... I would avoid the cheap aluminum ones as they are leak prone and promote heat soak. Phenolic is my favorite. You may have to clearance the bottom just a tad. My adapter:

    [​IMG]

    [​IMG]
     
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  7. Apr 15, 2020
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

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    The main difference with the 2150 and 2100 in Jeeps is the presence of the altitude compensator (aneroid). Sounds like it would be trouble, but it actually works well and seems to still be functional in the Jeep carbs without any maintenance or whatever. It's a large thing that protrudes from the back of the carb body on these Jeeps. Look at page 1J-63 in the '82 TSM here Jeep® Parts Manuals online

    aneroid2150 (505 x 514).jpg

    The 2150 also moves the choke pull-off from the air horn to the choke linkage, and adds a small auxiliary passage for choked running. Vacuum for the power valve becomes an external connection to manifold, presumably in an effort to minimize the problem with backfire puncturing the power valve. Later 360s have a Service Bulletin that moves the manifold vacuum connection for the power valve to the back of the engine, presumably to further buffer the manifold vacuum to the power valve.

    Norcal's phenolic adapter is the bee's knees - however, you could use the aftermarket aluminum adapter from Summit or Jegs with a phenolic insulator. I attached the poorly fitting aluminum adapter to my J10 manifold with a flat gasket and liberal Permatex #1 - not aesthetically perfect, but works fine. The 21xx carbs use both a thin and thick paper gasket along with a plastic holder Crown Automotive J3240515 Insulator Base for 81-91 Jeep J-Series Pickup with V8, 2 BBL Motorcraft Carburetor which should fit on your adapter. Used to be I would grab 2V base insulators at the pick-and-pull whenever I found them; they can be useful. I'm sure somebody online sells a 2V insulator besides the Jeep ones.
     
    Last edited: Apr 15, 2020
  8. Apr 15, 2020
    masscj2a

    masscj2a Member 2023 Sponsor

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    That set up looks nice and clean. How does the 2100 work off road? Does it load up when your off Cantor?
     
  9. Apr 15, 2020
    masscj2a

    masscj2a Member 2023 Sponsor

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    timgr, you are always a well of knowledge. I always am amazed at your answers to questions. I'm going to do more research on your post.
     
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  10. Apr 16, 2020
    Norcal69

    Norcal69 Out of the box thinker 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    Works great off road for everything that I've done. I would recommend making bowl vent extension/ link out of a piece of copper.
     
  11. Apr 16, 2020
    Vanguard

    Vanguard Take Off! Staff Member

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    This! The 1.08 venturi will define the flow/CFM.
     
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  12. Apr 16, 2020
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

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    Note that these carbs used in Jeeps have a thermoelectric choke. You need both hot air and the electric element for the choke to work properly. You could probably convert to the Holley electric choke using their kit. You'll need to plug the hot air port and vacuum passage in the carb body to disable the hot air part. The 2100 on my J10 has a manual choke, using the Dorman kit.

    I suspect that most of the Jeep 2150s are 1.08" size. I recall that's what my J20 has. The venturi diameter compared to the displacement will determine the vacuum at low speed; more vacuum gives better fuel control. I think the 21xx booster venturis are pretty good though, and the carb still works well on smaller displacement engines, even though it's designed for more air volume.
     
  13. Apr 16, 2020
    ITLKSEZ

    ITLKSEZ Hope for the best, prepare for the worst

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  14. Apr 16, 2020
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

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    Way back when, I had a 4100 (4V Autolite, same family as the 2100) on my '66 F100 with a 352. I found a 2V Holley from a 292 in the junkyard, and used those parts to convert my 4100 to manual choke. There are a lot of genes shared between Holleys and Autolite/Motocrafts. The Holley manual choke kit also may work for this.

    The Dorman kit is ok, but cheesy compared to the original parts. The bracket they supply is too flimsy, but you can make a stronger one easily.
     
  15. Apr 16, 2020
    masscj2a

    masscj2a Member 2023 Sponsor

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    Itlksez, I actually like putting pull throttles on most my carbs if I can. Keeps me from breaking axles.
     
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  16. Apr 16, 2020
    wheelie

    wheelie beeg dummy 2024 Sponsor 2023 Sponsor

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    The one I bought came with an electric choke on it and cheesy conversion parts. I like the manual choke and cable as well and have been looking for those original parts. Just don't find these dinosaurs in the junk yards around here anymore.
     
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  17. Apr 17, 2020
    Norcal69

    Norcal69 Out of the box thinker 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    I’ve had no complaints about the electric choke on my 2100. Fires up and high isles for several minutes before automaticity idling down to normal.
     
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  18. Apr 17, 2020
    colojeepguy

    colojeepguy Colorado Springs

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    The manual choke setup on the Ford carb and the Holley carb are quite different.
    Screenshot_2020-04-17-03-20-47-1.png
    Screenshot_2020-04-17-03-22-18-1.png
     
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  19. Jun 7, 2021
    peter

    peter Member

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    I'm now considering a carb change since my original Rochester 2G just doesn't seem to take a rebuild to run correctly. How do I choose between Motorcraft 2100 and Holley 2300? I have a manual choke. I would rather not have to add an adapter plate if possible. And do both of these options require a paper air cleaner and no more oil bath?
    Thank you.
    Peter
     
  20. Jun 7, 2021
    Norcal69

    Norcal69 Out of the box thinker 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    What intake manifold are you running? Your going to need an adapter anyway you go unless you have a 4bbl intake and 4bbl carb.
     
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