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  1. #1

    WTF? Noob needs help. Pics inside.

    Hmm, I reviewed the manual couldn't find anything to say otherwise. but clearly there's a difference. Same ID, but at the wrist pin boss (review pics) material on 1 of 3 pistons from wiseco was not machined. Is there an arrangement of some sort that I'm follow here? Is the odd ball piston supposed to be installed on the rear of the motor? Just noticed it while playing in the garage today.

    Thanks



  2. #2
    Moderator OsideBill's Avatar
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    Quote Originally Posted by ah0386 View Post
    Hmm, I reviewed the manual couldn't find anything to say otherwise. but clearly there's a difference. Same ID, but at the wrist pin boss (review pics) material on 1 of 3 pistons from wiseco was not machined. Is there an arrangement of some sort that I'm follow here? Is the odd ball piston supposed to be installed on the rear of the motor? Just noticed it while playing in the garage today.

    Thanks

    OLD VS NEW Wisecoe pistons, at some point Wisecoe decided to stop machining the sides.

  3. #3
    Quote Originally Posted by OsideBill View Post
    OLD VS NEW Wisecoe pistons, at some point Wisecoe decided to stop machining the sides.

    That's a quick response! So I take it no biggie to run with the other 2 like sets?

  4. #4
    Mpeavler's Avatar
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    Make sure the weight is the same....

    M

  5. #5
    Well, I'll call wiseco on Monday and see what they say about the weight difference.

  6. #6
    Old Ski Insanity w/rpm500's Avatar
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    i would think the pin itself would also have to be longer and heavyer if the circle clip sets at the same depth from the outside surface as the machined one.. a plus is that a longer pin would spread load better ...

    I'd want a matched set of one or the other..

  7. #7
    dghal's Avatar
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    I will assume you have the pins with the right pistons as the machined skirts uses a shorter pin,

    But yes I would call Weisco and make sure they say it is ok to run it that way, there is a weight difference,

  8. #8
    As OSIDEBILL said, it's the old style. They no longer machine or "lighten up" pistons. The machined pistons are the older style, and after talking to wiseco and my local shop, it shouldn't be a problem to swap them out for the new style.

    Just a minor delay.

  9. #9
    Moderator OsideBill's Avatar
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    Everything is still the same as far as components go, just more weight. what size is the piston? I have a .5mm over I got stuck with on a similar deal as yours. I like to keep things the same on the rotating mass so I found another that matched and installed it. It is brand new in the box.

  10. #10
    krispaintballz's Avatar
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    If it is 85.5 mm piston for a 65U I will take the cut ones. I have many new style.

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