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  1. #1

    Is .4 thou piston ring clearance asking for trouble?

    Hey guys, I just got my motor back from the engineers, I have given them cp piston specs to resleeve my block to get it right to specs..

    i have cp pistons .25 low comp,after I recieved back my block, I measured the piston ring clearance and its pretty tight at .4 is this asking for trouble?


  2. #2

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    Quote Originally Posted by rami_13b View Post
    Hey guys, I just got my motor back from the engineers, I have given them cp piston specs to resleeve my block to get it right to specs..

    i have cp pistons .25 low comp,after I recieved back my block, I measured the piston ring clearance and its pretty tight at .4 is this asking for trouble?
    That is the max. spec for piston clearance. .024-.04

  3. #3
    Eastside Powersports Slow 91's Avatar
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    are you talking piston to wall clearance or ring end gap?

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    Nothin' better than Doo'in it! BigDaddyRXP's Avatar
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    If anything measures .4" you have serious problems! Your rings are file fit. CP specs for boosted engines are bore size X .0055" for top ring. Second ring needs to be .004-.006" larger than top ring.

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    shrabber's Avatar
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    bore x 's 4 thousanths "ring gap" is fine stager fit set top ring at . 0045. But Heres the Kicker Your machine shop should have set the gap because Unless you have a bore Gauge How acurrate can you get the ring gap to the bore size.

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    Nothin' better than Doo'in it! BigDaddyRXP's Avatar
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    Quote Originally Posted by shrabber View Post
    4 thousanths "ring gap" is fine.

  7. #7
    Eastside Powersports Slow 91's Avatar
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    WAY to tight. ( assuming that's .004" x bore size) CP calls for .005"-.0055" x Bore size.

  8. #8
    shrabber's Avatar
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    sorry edit but we assume bore x's chris but bore x .0045. He had low compression so I assumed the Most least aggressive setup. I assumed we all were under the assumption Bore so I had to find my chart on Line. Carrillo changes there specs like we change Underwear

    http://www.cp-carrillo.com/LinkClick...D0%3d&tabid=74

  9. #9
    Eastside Powersports Slow 91's Avatar
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    bigdaddy doesn't wear underwear. nice try.

  10. #10
    Fat Man, Little Boat Region8Ultra250X's Avatar
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    Quote Originally Posted by Slow 91 View Post
    bigdaddy doesn't wear underwear. nice try.
    the fact that you know that is scary.

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