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  1. #1

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    Pro-x piston to cylinder wall clearance

    Need to double check with the pros here before i go any further

    2006 rxt 215 with pro-x pistons. Im seeing oem specs say .024 to .056 in my manual.

    For some reason i thought it was tighter than that. Anyone? Thanks


  2. #2
    Moderator Snoman's Avatar
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    Did your pistons not come with a spec sheet??It should be on there as each manufacture has different specs for thier piston....I know my CPs were .003 while Rivas were .0025 to .0030 and according to the manual it says .0023 to .0039(limit)..I would call Pro-X and see if they can E-mail you a spec sheet..

  3. #3

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    They said to run with OEM specs from the manual. Machine shop is saying .0015-.003 at the max so I think I'm going to shoot for the middle of that range unless I hear different.

  4. #4

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    I just keep reading that some people are running .004-.005 and that sounds like it would make the knock sensor go crazy.

  5. #5

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    Quote Originally Posted by Edmonds View Post
    I just keep reading that some people are running .004-.005 and that sounds like it would make the knock sensor go crazy.
    The knock sensor will detect detonation, not piston slap...

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  7. #6
    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by Edmonds View Post
    I just keep reading that some people are running .004-.005 and that sounds like it would make the knock sensor go crazy.
    not at all. I set all my motors up with a minimum of .004 clearance. I use CP pistons.

  8. #7
    SLASHER's Avatar
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    I have used Pro X many times at 3.5 - 4 thou clearance

  9. #8

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    I would use CP if I could get them at a good price. My dealer cost on the PRO-X are 130ea. Where is the best place to get the CP's?

  10. #9

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    [QUOTE=bluestram;2499273]
    Quote Originally Posted by Edmonds View Post
    I just keep reading that some people are running .004-.005 and that sounds like it would make the knock sensor go crazy.
    I have two engines that I built using CP and .004 clearance. Motec logging lots of "knock" thru the knock sensor. Doesn't matter whether I use C12 or standard 93 octane. I have adjusted the knock sensitivity enough to eliminate timing retard and come to the conclusion that its just noise. I have at least 30-40 WOT passes at 9K in the 84-85 MPH range with zero issues.

  11. #10
    JT jpt7779's Avatar
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    See post #4 here for professional engine builder specs with Cp Pistons:

    http://www.greenhulk.net/forums/showthread.php?t=227324

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