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holley carb question

Discussion in 'Early CJ5 and CJ6 Tech' started by 67cj5, Nov 2, 2004.

  1. Nov 2, 2004
    67cj5

    67cj5 Member

    Oregon
    Joined:
    Oct 15, 2004
    Messages:
    347
    I have a 67 cj5 with the dauntless 225 motor. I have headers, aluminum intake and a mild cam. I put a 450 cfm holley on it and it runs good, just a little rich. I was wondering what jet size everyone else is running on the 390, and 450 holley carbs.I have a jet kit but it starts at 66, I have 56 in it now. thanks in advance for any help. Oh I am at sea level on oregon on the coast.
     
    67cj5, Nov 2, 2004
    #1
  2. Nov 2, 2004
    jpflat2a

    jpflat2a what's that noise?

    Hermosa, SD
    Joined:
    Jul 30, 2003
    Messages:
    8,525
    FWIW
    Roch 2G was .051 from factory
     
    jpflat2a, Nov 2, 2004
    #2
  3. Nov 2, 2004
    jeepdaddy2000

    jeepdaddy2000 Active Member

    Eagle Point oregon
    Joined:
    Jun 24, 2004
    Messages:
    1,181
    Rich at idle? Cruise? under power? Might not be mains.
     
    jeepdaddy2000, Nov 2, 2004
    #3
  4. Nov 3, 2004
    67cj5

    67cj5 Member

    Oregon
    Joined:
    Oct 15, 2004
    Messages:
    347
    rich under load, and idle. I havent had it out for a spin yet though to check under cruise condition
     
    67cj5, Nov 3, 2004
    #4
  5. Nov 3, 2004
    65CJ5

    65CJ5 Member

    Albuquerque
    Joined:
    Sep 22, 2002
    Messages:
    156
    Check your idle mix settings. I recently put a Holley 2300 2-barrel on the M715 and it ran rich until I leaned out the idle mixture.
     
    65CJ5, Nov 3, 2004
    #5
  6. Nov 4, 2004
    dauntless_powered

    dauntless_powered SUB COB 2024 Sponsor

    Groton, CT
    Joined:
    Nov 3, 2003
    Messages:
    1,000,081
    not to hijack this, but does any one now where i can find a diagram or somehting on how to set the idle mix on my holly 390, i too am running rich
     
    dauntless_powered, Nov 4, 2004
    #6
  7. Nov 4, 2004
    dauntless_powered

    dauntless_powered SUB COB 2024 Sponsor

    Groton, CT
    Joined:
    Nov 3, 2003
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    1,000,081
    i know where the screw is, but which way and how much do i trun it and how do i tell when im good
     
    dauntless_powered, Nov 4, 2004
    #7
  8. Nov 4, 2004
    w3srl

    w3srl All-around swell dude Staff Member

    Port Orange, FL
    Joined:
    Nov 6, 2002
    Messages:
    4,275
    Idle mix screws are on the outboard sides of the metering block, in between the carb body and the float bowl. They're only on the primary side of the carb, there will be blank spots on the secondary metering plate, no screws.

    Running at idle, turn one screw in (clockwise) until the engine sputters and then back it out until it idles smoothly again. Repeat with the other side. This should get you in the ballpark.

    Also, it is worth checking the float setting while you are at it. There will be a slotted plug on one side of the float bowl, it should be about a 1/4" in diameter. With the engine off, put a wadded up shop rag under the bowl, directly under this hole and remove the plug. No fuel should run out. Bounce the fender on the same side of the Jeep that the plug is on, and a drip or two of fuel should run out.

    Have an assistant start the Jeep while you watch the hole. If fuel pours out, STOP ENGINE. Your float level is too high. Loosen the set screw on top of the float bowl and adjust the nut until the float drops and fuel stops running out. Replace the rag and have the assistant start the engine again. Bounce the fender again, and repeat the process over and over again as needed.

    If no fuel at all comes out of the hole when you bounce the fender, than the float may be too low. Adjust it upward, using the same "fender test" until you get just a drop of fuel out of the hole.

    Now, remove all the soaked rags, and put a dry one back under the bowl. With the sight plug still out, have your assistant start the jeep again ad there should be barely any fuel dribbling out of the sight hole when it idles. If you have it dead nuts on, you should be get barely a trace of fuel running out at idle.

    Did I miss anything guys?
     
    w3srl, Nov 4, 2004
    #8
  9. Nov 4, 2004
    65CJ5

    65CJ5 Member

    Albuquerque
    Joined:
    Sep 22, 2002
    Messages:
    156
    Steve,

    I like to use a vacuum gauge when setting the idle mix screws. Other than that I think you got it...

    Stan
     
    65CJ5, Nov 4, 2004
    #9
  10. Nov 4, 2004
    xz3ltt

    xz3ltt I love hockey mom's

    Clarkston, MI
    Joined:
    Apr 3, 2004
    Messages:
    96
    Secondary techometer also works well, if you have one. Enrichen until RPM doesn't increase anymore, then lean roll it 20 rpm....
     
    xz3ltt, Nov 4, 2004
    #10
  11. Nov 4, 2004
    JK67CJ5TX

    JK67CJ5TX Member

    El Paso, Texas
    Joined:
    Oct 24, 2003
    Messages:
    81
    I have 59's in my Holley 2300 series, 390 cfm 2 bbl. Runs a hair "fat" at an elevation of around 4000 msl.

    JK
     
    JK67CJ5TX, Nov 4, 2004
    #11
  12. Nov 4, 2004
    65CJ5

    65CJ5 Member

    Albuquerque
    Joined:
    Sep 22, 2002
    Messages:
    156
    I put 57s in my Holley 2300, 5000' above sea level. Seems about right. 61s are what they come with (sea level jets)

    Stan
     
    65CJ5, Nov 4, 2004
    #12
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