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1968 Cj5 225 V6 Oddfire

Discussion in 'Early CJ5 and CJ6 Tech' started by Whiteagle, Oct 3, 2020.

  1. Oct 3, 2020
    Whiteagle

    Whiteagle New Member

    Idaho
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    Oct 1, 2020
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    7
    Recently acquired the above jeep. I have had others but this is my first exposure to an odd fire engine. Always worked on a amc 258 straight 6. Took the distributor apart and cleaned it, installed new points, condenser, rotor, cap, vacuum advance, and coil. I have done research on the cam lobes on the distributor shaft. It has 3 pointy lobes, and 3 flatter lobes which alternate. My question is which kind of lobe is used to fire the number 1 cylinder. I have brought the number 1 up to compression stroke and arranged the distributor to fire on the number 1 plug. Point gap is 16, timing mark at 5 btdc. Engine fires up easily and idles roughly, has 17by vacuum. Under load back fires and has no power. I used one of the narrow cam lobes to fire the number one plug. Its not running correctly. I figured to ask you folks before trying the other flat lobe. Also when I hook up a dwell meter to the negative side of the coil it stalls the engine immediately. Any ideas?
     
    Whiteagle, Oct 3, 2020
    #1
  2. Oct 3, 2020
    Admiral Cray

    Admiral Cray I want to do this again.. Staff Member

    Bainbridge...
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    Welcome from Bainbridge Island, WA... :wel:
     
    Admiral Cray, Oct 3, 2020
    #2
  3. Oct 3, 2020
    technologyteacher

    technologyteacher Member

    Elkin NC
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    Welcome from NC
     
    technologyteacher, Oct 3, 2020
    #3
  4. Oct 3, 2020
    Fireball

    Fireball Well-Known Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Pullman, WA
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    Welcome from Eastern Washington!
     
    Fireball, Oct 3, 2020
    #4
  5. Oct 3, 2020
    Buildflycrash

    Buildflycrash More or Less in Line. 2024 Sponsor 2022 Sponsor

    Gulf Breeze FL...
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    No help from me on the poor running issues. But welcome to the early jeep world.
     
    Buildflycrash, Oct 3, 2020
    #5
  6. Oct 3, 2020
    Geo

    Geo New Member

    road island
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    Sep 6, 2020
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    I'd verify each wire is getting spark, try moving your timing light to each wire.
    And yeah, those dist lobes are weird!
     
    Geo, Oct 3, 2020
    #6
  7. Oct 4, 2020
    colojeepguy

    colojeepguy Colorado Springs

    At the foot of...
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    You should post this question in the early cj tech section, it'll get more views there.
    Oh, and welcome!
     
    colojeepguy, Oct 4, 2020
    #7
  8. Oct 4, 2020
    Twin2

    Twin2 not him 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Virginia Beach, VA
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    welcome to forum
     
    Twin2, Oct 4, 2020
    #8
  9. Oct 4, 2020
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Bozeman, MT
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    You've probably already verified this - but make sure you have an odd-fire distributor cap. The odd fire distributor (with the uneven cam lobes) has evenly spaced wire plugs around the cap....I'm gonna repost in the tech section - we should have some helpful members that can verify the #1 cam lobe...
     
    FinoCJ, Oct 4, 2020
    #9
  10. Oct 4, 2020
    Whiteagle

    Whiteagle New Member

    Idaho
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    Oct 1, 2020
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    I ordered an odd fire distributor cap, the one I received has even spaced terminals. I have seen that the HEI caps have an odd configuration. So far I have been unable to find a pic of an odd point breaker cap. And thanks to all for the welcome.
     
    Whiteagle, Oct 4, 2020
    #10
  11. Oct 4, 2020
    Whiteagle

    Whiteagle New Member

    Idaho
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    Oct 1, 2020
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    How do I verify it is an odd fire cap?
     
    Whiteagle, Oct 4, 2020
    #11
  12. Oct 4, 2020
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Bozeman, MT
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    Post some pics of the whole set up...other stuff to keep in mind is identifying which distributor you have: prestolite or delco style. As for the dist cap, IIRC, the odd fire cap has evenly spaced wire terminals, whereas the early even fire cap had unevenly spaced wire terminals. A search of the forum for delco distributor should bring up threads with photos to help you identify what you have.
     
    FinoCJ, Oct 4, 2020
    #12
  13. Oct 11, 2020
    Whiteagle

    Whiteagle New Member

    Idaho
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    Hello, I wanted to thank you for your responses and help. I took your advice and checked the distributor cap. Turns out the new cap had a different configuration then the old one, so I changed it back. After a few times of trial and error I figured out that the wider flat lobe is the one that fires the number one cylinder. I reset the points 0.16 then static timed it at 5 btdc, and it fired right up. No backfires at all, running smoothly as it was designed to do. Same as an even fire now that I know how it works.
    I see that you have the tera low gearing set up. I am gonna sent my warn overdrive to herm for a rebuild, can those low gears be incorporated into the overdrive in the rebuild,or is it a separate gear box.
    Thanks again for your help
    On Sunday, October 4, 2020, 01:50:56 PM MDT, EarlyCJ5 Service Account <earlycj5.administrator@earlycj5.com> wrote:
     
    Whiteagle, Oct 11, 2020
    #13
    Walt Couch, Fireball and FinoCJ like this.
  14. Oct 11, 2020
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Bozeman, MT
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    The tera low gears go into the D18 transfer case. But that will also require changing the bowl gear that drives both the transfer case and OD. Herm would normally have the correct gear so yes, chat with him about it. Assuming you are keeping the T14, you will need to keep the 10spline planetary gears inside the bowl gear, but will need smaller diameter, lower tooth count bow gear. IIRC, the tooth count will go from 29 to 26, but you can verify that on herm's website, or give him a call. Also worth noting, if you plan to run (or already have) a different transmission, then the planetary gears are different - most other jeep transmissions and common swaps use a 6spline output. The planetary gears and bowl gears can be mixed and match to make what you need...just know what you have, and chat with herm...as for herm, I have found that some of the details can get lost, so make sure everyone is very clear on what you want or need done.
     
    FinoCJ, Oct 11, 2020
    #14
  15. Oct 11, 2020
    Walt Couch

    Walt Couch sidehill Cordele, Ga. 2024 Sponsor 2023 Sponsor 2022 Sponsor

    cordele, Ga.
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    Welcome from Ga.
     
    Walt Couch, Oct 11, 2020
    #15
  16. Oct 11, 2020
    masscj2a

    masscj2a Member 2023 Sponsor

    Ware, Mass
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    Welcome from Chester, Mass.
     
    masscj2a, Oct 11, 2020
    #16
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