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  1. #1
    SHOBiz's Avatar
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    Excessive cylinder wear

    Anyone else had issues with excessive cylinder wall wear with JE pistons and/or Riva or R&D liners?

    This was after just 10 hours. Huge wear.



  2. #2
    8upwitHDs's Avatar
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    Is the head gasket leaking?? Do you hear a lot of piston slap??

    That looks more like bad timing and running lean. That 3rd cylinder looks like it is scorched.

  3. #3
    big john's Avatar
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    that cylinder is really worn, not good at all

  4. #4

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    there definately appears to be ater deposits on the piston crowns which will make it run lean you have a leak somewhere.

  5. #5
    Lightning Struck's Avatar
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    How in the hell can you tell cylinder wear by that pic? What did it measure out to? How much of an upper ridge is there?

    What was your piston skirt to cylinder clearance? How about ring gap?

  6. #6
    SHOBiz's Avatar
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    Quote Originally Posted by Lightning Struck View Post
    How in the hell can you tell cylinder wear by that pic? What did it measure out to? How much of an upper ridge is there?

    What was your piston skirt to cylinder clearance? How about ring gap?
    The picture does not do it justice. There is wear in all four liners on the sides (left/right). Something that no way in hell should be there particularly after just 10 hours.

    Jim would have to answer to piston clearance and ring gap. I don't remember.

  7. #7
    Lightning Struck's Avatar
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    Until you dial bore the cylinders, it's just speculation.. What you perceive as "wear" could be from seating the rings. Is there a ridge at the deck?

    Ring gap should have been around .022" or so.. Can't go by OE spec
    And probably around .003" on the walls

  8. #8
    SHOBiz's Avatar
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    I give....

  9. #9
    THE PLATE MAN JIM'S PERFORMANCE's Avatar
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    Hard to tell from picture but number 2 looks like you can still see the cross hatch.

    A few things can cause it on a new motor if it runs very lean in the beginning before it breaks in it will cause the piston and rings to expand very quick and it will put pressure on the cylinders and prematurely wear them.

    Or you have a intercooler leaking and that's were the rust came from and that will also cause cylinders to wear because the water is washing away the oil and causing friction.

  10. #10
    Lightning Struck's Avatar
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    Quote Originally Posted by SHOBiz View Post
    I give....
    I'm not trying to be a prick. I've built several motors with JE & SRP.pistons with no issues.. If the clearances are right, its something else, like Jim is saying

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