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  1. #1
    ncdoo's Avatar
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    05 RXP Rebulid Piston/cylinder wall clearance

    Rebuilding my first 4-TEC, dropped a couple valves. I've got it torn down, only 35 hrs on the ski. There is minimal cylinder wall damage to the cylinder that dropped the valve, I think it'll clean up at .010. I see in the manual that the recommended cylinder wall clearance is .001?? Is that correct? I've never seen a engine run with one thousandth clearance.
    Also the head is beat up pretty bad. Valve head cut into the dome pretty deep in a couple spots. How bad is too bad on these?


  2. #2
    Moderator beerdart's Avatar
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    Im showing service limit .004"

  3. #3
    ncdoo's Avatar
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    Yea I see that .0039 wear limit, but new is .001, I'm guessing the piston expansion rate is the consistent with the expansion rate of the cylinder.

  4. #4
    Stockrxp's Avatar
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    what pistons are you gonna run?

  5. #5
    Stockrxp's Avatar
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    slow 91 can fix your head

  6. #6
    ncdoo's Avatar
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    Oem pistons, what else is there? WSM?

  7. #7
    I had to go .020 when I repaired mine. Make sure you have the correct end gap on the rings.

  8. #8
    mac_man_luke's Avatar
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    Quote Originally Posted by ncdoo View Post
    Oem pistons, what else is there? WSM?
    CPs seem to be the pick at the moment but there are also Rivas and a few others.

  9. #9
    Stockrxp's Avatar
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    anyone running Wiseco? i believe when i clearance my pistons ( 9.5 rivas) they were at.028 thou

  10. #10
    ncdoo's Avatar
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    CPs?? .028 thou piston clearance??? How did we go from .001 to .028? I'm assuming you mean ring end gap. Who sells the .020 over pistons other that WSM and SBT?

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