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Timing Diff 225 with 350/231 Timing Cover

Discussion in 'Early CJ5 and CJ6 Tech' started by Warloch, Mar 18, 2006.

  1. Warloch

    Warloch Did you say Flattie??? Staff Member

    So I have been trying to figure out why the 225 just didn't seem to have the power I expected - then it hit me.

    The timing cover on the engine is off of a Buick 350/231 not a 225. I have one of each sitting on stands lookin at me the whole time. Doing some measuring it looks like the 0* mark is 7/8" different or what looks like 15* retarded? - Higher on the crank with the 350/231 timing cover.

    Anybody else know about this and confirm that I am not 'thinking wrong' again?
     
    Warloch, Mar 18, 2006
    #1
  2. Warloch

    Warloch Did you say Flattie??? Staff Member

    So, no one else has done this?
     
    Warloch, Mar 20, 2006
    #2
  3. sparky

    sparky Sandgroper Staff Member Founder

    I thought someone else here had used a 231 cover on a 225. A 350 should be the same I'd think, the crank wasn't split yet. If it was for an EF 231 is that the difference?
     
    sparky, Mar 20, 2006
    #3
  4. michigan_pinstripes

    michigan_pinstripes I'm not lost, I'm wandering

    Although OF and EF cylinder intake/exhaust "events" are timed differently, 360* is 360* on #1 TDC I would think.

    Even:
    60-60-60-60-60-60
    1 6 5 4 3 2
    vs
    Odd:
    90-150-90-150-90-150
    1 6 5 4 3 2


    Interesting to ponder this. I keep thinking in my mind how my L-head timing is off by 15* due to the oil pump being off a tooth or so. We found this out by accident when we tuned it by vaccum.


    Bui-ha's can't be off.... can they?
     
    michigan_pinstripes, Mar 20, 2006
    #4
  5. Glenn

    Glenn Kinda grumpy old man Staff Member

    Finding TDC on the compression stroke will confirm whether you're right ot not. Makes sense though if the timing's retarded on your power issue.
     
    Glenn, Mar 20, 2006
    #5
  6. willys59cj5

    willys59cj5 Sponsor

    I was told by a friend you can do a rough estimate of TDC using a dowel and putting it through the spark plug hole. Make sure you don't have too much slack in the timing chain. Then mark your 0 at TDC on the cover. After that you can place timing marks on the harmonic balancer inorder to determine amount of advance.
     
    willys59cj5, Mar 20, 2006
    #6
  7. Warloch

    Warloch Did you say Flattie??? Staff Member

    Thanks - Ya Sparky, it's the same as the 231's I have. Going to work on finding TDC, but the weather moved in and it's -8 with wind chill. My guess puts the 0* behind the bolt that mount the timing marks on the cover.

    Michigan - it is 360* but the point in rotation where that starts and ends is what I am trying to figure out.

    I'll get some pics and post them, if for nothing other than a sanity check (mine is always in question).
     
    Warloch, Mar 20, 2006
    #7
  8. sparky

    sparky Sandgroper Staff Member Founder

    Or just pull the valve cover off and watch for the intake valve to close. That's what I did.
     
    sparky, Mar 20, 2006
    #8