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Is it really worth changing out the carb?

Discussion in 'Early CJ5 and CJ6 Tech' started by rocmoc, Aug 20, 2013.

  1. Aug 20, 2013
    rocmoc

    rocmoc Member

    Southern Arizona...
    Joined:
    Apr 25, 2012
    Messages:
    91
    Have a '70 CJ5 with the factory stock 225 with the factory carb. Read an article about how great the Ford 2100 two barrel carb was as a mod for the Jeep. Is it really worth changing out the stock carb for the Ford carb?

    Thanks,
    rocmoc n AZ/Mexico
     
    rocmoc, Aug 20, 2013
    #1
  2. Aug 20, 2013
    cj6/442

    cj6/442 Sponsor

    Fallbrook, Calif
    Joined:
    Feb 6, 2008
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    2,734
    I have had awesome results with the tiny 2G, it is a rpm limiter though
    when I brought my jeep to Glamis dune ,I had a hard time running in the sand ,so the next time I went I though on a holley 390 and could not believe how it affected the higher rpm.

    does the ford carb flow more ?
     
    cj6/442, Aug 20, 2013
    #2
  3. Aug 21, 2013
    lynn

    lynn Time machine / Early CJ5 HR Rep Staff Member

    Huntingdon PA
    Joined:
    Sep 20, 2002
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    3,437
    The motorcraft 2100 is a great upgrade to replace the troublesome BBD on late model CJs.
    On the 225 V6, the stock Rochester 2G is a good, reliable carb, not overly sensitive to offroad angles.
    There's no reason to swap it out for any other carb unless you need more high-rpm, as Steve said above.

    The MC 2100 came in a few flavors. The one most commonly used on the inline sixes has a circle on the carb body with 1.08 stamped inside the circle. The ones with higher numbers have a higher flow rate and are usually too much for a stock 258.
    There is also an MC 2150 carb... it's the high-altitude versionof the 2100.
     
    lynn, Aug 21, 2013
    #3
  4. Aug 21, 2013
    rocmoc

    rocmoc Member

    Southern Arizona...
    Joined:
    Apr 25, 2012
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    91
    Thanks guys. My first desire is mileage. More Rs would be great but not necessary. I rarely play in the sand, mostly trails & rocks. Present carb is ready for a rebuild so if I was going to make a change the time is now. Thanks again.

    rocmoc n AZ/Mexico
     
    rocmoc, Aug 21, 2013
    #4
  5. Aug 21, 2013
    lynn

    lynn Time machine / Early CJ5 HR Rep Staff Member

    Huntingdon PA
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    Sep 20, 2002
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    3,437
    When the '71 CJ5 I had was young (mid-70s) and in stock form (225 V6, 28" tires), it got 19 mpg highway. :shock:

    My 05 LJ gets 15 highway. :mad:
     
    lynn, Aug 21, 2013
    #5
  6. Aug 21, 2013
    AKCJ

    AKCJ Active Member

    Fairbanks, Alaska
    Joined:
    Aug 12, 2003
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    1,036
    I like the 2G on my 70/225. It is a great carb. GM spent a lot of time and $ on it.

    For gas mileage take a close look at your timing and timing advance.
     
    AKCJ, Aug 21, 2013
    #6
  7. Aug 22, 2013
    Jeepenstein

    Jeepenstein Me like Jeep.. 2024 Sponsor

    North Central FL
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    Jun 15, 2003
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    2,159
    2G.. Keep it.. Love it.. Pet it and call it George.. It's a great little carb. I've had mine nearly vertical and kept right on running..
     
    Jeepenstein, Aug 22, 2013
    #7
  8. Aug 22, 2013
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
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    23,596
    JMO. Keep the 2G. Or go fuel injection. That would be a significant improvement.
     
    timgr, Aug 22, 2013
    #8
  9. Aug 22, 2013
    termin8ed

    termin8ed I didn't do it Staff Member

    Mason, MI
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    Dec 22, 2002
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    4,422
    Ive had mine on the dunes and had no problems. Had issues how the pedal linkage hooked up to the 2g limiting full travel. I'm only running 30" tires also.
     
    termin8ed, Aug 22, 2013
    #9
  10. Aug 22, 2013
    cj6/442

    cj6/442 Sponsor

    Fallbrook, Calif
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    Feb 6, 2008
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    2,734

    my carbs name IS George and mine runs when jeep is laying on it's side .
     
    cj6/442, Aug 22, 2013
    #10
  11. Aug 23, 2013
    Jeepenstein

    Jeepenstein Me like Jeep.. 2024 Sponsor

    North Central FL
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    :)
     
    Jeepenstein, Aug 23, 2013
    #11
  12. Aug 26, 2013
    rocmoc

    rocmoc Member

    Southern Arizona...
    Joined:
    Apr 25, 2012
    Messages:
    91
    Thanks everyone. My carb, while nearing rebuild time, is still giving good mileage & performance. Just wanted to spend my time & money in the most productive way.

    Thanks again,
    rocmoc n AZ/Mexico
     
    rocmoc, Aug 26, 2013
    #12
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