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4 Bbl Tuning

Discussion in 'Early CJ-5 and CJ-6 Tech' started by John Schiefer, Feb 13, 2019.

  1. Feb 13, 2019
    John Schiefer

    John Schiefer Fltfndr

    Clive, IA
    Joined:
    Dec 24, 2010
    Messages:
    183
    Running a Dauntless V6 in my 2A with headers, Offy 360, and Holley 390. Could use some tuning tips on the Holley. Already have vent tube installed and jetted down to # 49. Where to go from here.

    Fltfndr
     
  2. Feb 13, 2019
    colojeepguy

    colojeepguy Colorado Springs Sponsor

    At the foot of...
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    Apr 4, 2010
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    What problems are you experiencing with it?
     
  3. Feb 13, 2019
    John Schiefer

    John Schiefer Fltfndr

    Clive, IA
    Joined:
    Dec 24, 2010
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    183
    Interested in modifications that allow operations on steep climbs or extreme side hills or extreme rough terrain.
     
  4. Feb 13, 2019
    duffer

    duffer Rodent Power Sponsor 2019 Sponsor

    Bozeman, MT
    Joined:
    Sep 17, 2009
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    2,440
    The spring loaded needles would be first on the list. I assume the 390 has side hung floats? I extended the vent to just a bit below the top of the air cleaner (which was a 6" tall one).
     
  5. Feb 15, 2019
    John Schiefer

    John Schiefer Fltfndr

    Clive, IA
    Joined:
    Dec 24, 2010
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    183
    Seems to run fine in normal off road use but am concerned about steep angle climbs, off camber trails. What do spring loaded needle seats do?
     
  6. Feb 15, 2019
    70cj5134f

    70cj5134f Member

    East Tn
    Joined:
    Aug 18, 2018
    Messages:
    645
    They keep the needle from bouncing.
    U can also lower the fuel level a bit below the sight plug.(helps keep fuel from coming out vent)
     
  7. Feb 15, 2019
    Warloch

    Warloch Did you say Flattie??? Staff Member Sponsor

    Falcon, CO
    Joined:
    Mar 4, 2003
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    4,356
    I ran the 390s before going TA470 and then EFI on the 225s. The Vent extension and spring needle seats are a must. You can also add baffles to the bowls and that can help quite a bit as well.
     
  8. Feb 18, 2019
    John Schiefer

    John Schiefer Fltfndr

    Clive, IA
    Joined:
    Dec 24, 2010
    Messages:
    183
    Just curious, what EFI are you using?
     
  9. Feb 18, 2019
    Warloch

    Warloch Did you say Flattie??? Staff Member Sponsor

    Falcon, CO
    Joined:
    Mar 4, 2003
    Messages:
    4,356
    Started with the Powerjection system and have since moved to EZ-EFI. I have it running on the Red '51 and the Blue '49 - both with 225s and HEI (required). Going to put the Summit version on a '62 I'm building for my niece, and help my neighbor put it on his rig I built for him.

    Video here for it running on the Blue '49
     

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