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231 Evenfire or Oddfire?

Discussion in 'Early CJ5 and CJ6 Tech' started by Zia Tux, Dec 17, 2006.

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  1. Dec 17, 2006
    Zia Tux

    Zia Tux Member

    Lincoln, NM
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    I just discovered that my V6 is a 231 rather than a 225. How can I tell if its Oddfire or Evenfire?:v6:
     
    Zia Tux, Dec 17, 2006
    #1
  2. Dec 17, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    sparky, Dec 17, 2006
    #2
  3. Dec 17, 2006
    SRedinger

    SRedinger Member

    Now Eugene, Oregon
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    If it has a cast timing degree mark on the timing chain cover its an Odd-fire. If the heads have no freeze plugs its an Odd-Fire.
     
    SRedinger, Dec 17, 2006
    #3
  4. Dec 17, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    I've said it before, I'll say it again. Casting numbers don't lie. I wouldn't trust the timing cover theory.

    Heck, I don't totally trust the distributor thing after buying a 225 that had an EF distributor in it that ran fine. Check the casting numbers.

    Casting numbers don't lie. Timing covers can be swapped easily.

    Casting numbers are easy to check to be sure. Good point on the heads though.
     
    sparky, Dec 17, 2006
    #4
  5. Dec 17, 2006
    Zia Tux

    Zia Tux Member

    Lincoln, NM
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    Jul 22, 2006
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    Cleaned it up and found the block #s.
    25506397
    C 27 5

    So it must be an evenfire.
    I found this chart that conflicts the the one you linked me to Sparky.

    http://www.gnttype.org/general/v6hist.html

    According to their chart my block # would be 1983 3.8. and the EarlyCJ5 chart says it would be a 1979-81. I would assume the EarlyCJ5 chart is right because because the engine doesnt have electronic ignition.
     
    Zia Tux, Dec 17, 2006
    #5
  6. Dec 17, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    I can't remember where Joel got those numbers to be honest.

    I should make a note of that there. Interesting that they conflict though.

    At least it does say it's an even fire. But I've never seen a 231 that wasn't electronic ignition?
     
    sparky, Dec 17, 2006
    #6
  7. Dec 17, 2006
    w3srl

    w3srl All-around swell dude Staff Member

    Port Orange, FL
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    Easy to swap a distributor tho..

    <ducking>
     
    w3srl, Dec 17, 2006
    #7
  8. Dec 17, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    Tis true! R) Heck, they even seem to run right. :rofl:
     
    sparky, Dec 17, 2006
    #8
  9. Dec 18, 2006
    Zia Tux

    Zia Tux Member

    Lincoln, NM
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    So what do you guys mean? Do you think that someone may have changed it from electronic ignition to points? Strange.:?
     
    Zia Tux, Dec 18, 2006
    #9
  10. Dec 18, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    There were no pointed 231s, they all were HEI (well as far as I know), so yes someone swapped a distributor. Which is quite odd. Well, unless it's an aftermarket like a Mallory Dual point?

    Got any pictures of the distributor? At this point I'm just as puzzled as I was with my 225. :?

    Is your timing cover as SReddinger described with the cast (225) or bolt on (231) timing marks?
     
    sparky, Dec 18, 2006
    #10
  11. Dec 18, 2006
    Zia Tux

    Zia Tux Member

    Lincoln, NM
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    When I get off work I will take a pic if it's not too dark. I do know that the distributer has evenly spaced plugwire terminals and has a small square metal door on the side that slides up. I know I've read something somewhere about these distributer.
     
    Zia Tux, Dec 18, 2006
    #11
  12. Dec 18, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    Pointed distributors don't look any different externally. The spacing on the cam that opens the points is what's different. The lobes aren't spaced in an even pattern.
     
    sparky, Dec 18, 2006
    #12
  13. Dec 18, 2006
    jeepfreak81

    jeepfreak81 When in Doubt, Pedal out!

    Owosso, MI
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    Now you got me wanting to call that guy I traded my 231 OF to... I could swear it had points... then again I never looked that close so I could easily be wrong.
     
    jeepfreak81, Dec 18, 2006
    #13
  14. Dec 18, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    Hey, like I said, as far as I know. But if it were an odd-fire 231 that wouldn't surprise me as much you can swap in a 225 distributor. Novak's website even mentions that specifically but then says it'd be silly to do.

    Remember, when doing the conversion you go to the parts store and ask for a '75-mid 77 231 distributor. I've not seen points listed as an option.
     
    sparky, Dec 18, 2006
    #14
  15. Dec 18, 2006
    Mcruff

    Mcruff Earlycj5 Machinist

    Albertville, AL
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    Its possible that this was a boat engine originally. The marine industry was real slow to adopt electronic igniton compared to the auto industry. I've seen marine engines all the way to the late 70's that still had points in them.
     
    Mcruff, Dec 18, 2006
    #15
  16. Dec 18, 2006
    Zia Tux

    Zia Tux Member

    Lincoln, NM
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    Mcruff may have a point. When I rebuilt the carb (rochester 1 barrel) i notice that it had a marine engine listed and I've never heard of anyone elese haveing this carb on their V6. Also one exhaust mani exits to the front and one to the rear whitch I think is a characteristic of the 231 right?
     
    Zia Tux, Dec 18, 2006
    #16
  17. Dec 18, 2006
    Mcruff

    Mcruff Earlycj5 Machinist

    Albertville, AL
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    The 225's in the jeep used 2 passenger side manifolds which makes the drivers side point forward to clear the ross steering box.
     
    Mcruff, Dec 18, 2006
    #17
  18. Dec 18, 2006
    Zia Tux

    Zia Tux Member

    Lincoln, NM
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    This is crazy. I don't know what I have. I'll just have to take some pics when I get home if I can.
     
    Zia Tux, Dec 18, 2006
    #18
  19. Dec 18, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    Could be, that's something I'd not thought of.
     
    sparky, Dec 18, 2006
    #19
  20. Dec 18, 2006
    Vanguard

    Vanguard Take Off! Staff Member

    Vista, CA USA
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    The casting numbers from my chart came from an old school engine rebuilders guide. I'm sure I originally posted the origin, but it's been a heck of awhile. IIRC, I think they match pretty well with those listed on the grand national link posted earlier.
     
    Vanguard, Dec 18, 2006
    #20
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