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Thread: piston buttons

  1. #1
    Join Date
    Feb 2011
    Location
    Sarasota, Florida
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    6,210

    piston buttons

    I believe CAIMAG has the best, and most knowledgeable motor builders I have read on the web, so I'd like to get opinions on wrist pin buttons as opposed to metal clips. I have made buttons for a motor I am putting together. I made them to have a light finger press into the wrist pin hole, and piston bore. I used the plastic called UHMWP, or umpee as it is called in the automation business. Any opinions, or warnings would be most appreciated. Thanks.


  2. Re: piston buttons

    Teflon is slicker and has a lot higher melting point. I machine a lot of UHMW and Teflon, the UHMW grows and shrinks during machining more than Teflon. My opinion Eric.

  3. #3

    Re: piston buttons

    I read that Teflon was it. Always open to new ideas though.
    Grooving in Shovely sunshine

  4. #4

    Re: piston buttons

    Works best when the incoming air and oil are very clean, dirt embeds in those plastics and scours the cylinder walls.

  5. #5

    Re: piston buttons

    According to UHMWP Wiki it doesn't have enough heat resistance.
    This typical piston temperature chart shows 300f at the pin.

  6. #6
    Join Date
    Feb 2011
    Location
    Sarasota, Florida
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    Re: piston buttons

    Lots of good advice, and warnings. Thanks everyone; Teflon it will be.

  7. #7
    Join Date
    Sep 2013
    Location
    Victoria, Australia
    Posts
    157

    Re: piston buttons

    What about PEEK Eric? It has very good heat resistance and is used for all sorts of similar stuff. And I know you have some.

    https://en.wikipedia.org/wiki/Polyether_ether_ketone

  8. #8

    Re: piston buttons

    Peek is what everyone I no uses for the skirt buttons on Nitro H-D's, and aluminium for the piston pin buttons.

  9. #9
    Join Date
    Feb 2011
    Location
    Sarasota, Florida
    Posts
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    Re: piston buttons

    Quote Originally Posted by Peter Cooke View Post
    What about PEEK Eric? It has very good heat resistance and is used for all sorts of similar stuff. And I know you have some.

    https://en.wikipedia.org/wiki/Polyether_ether_ketone
    I do have some PEEK, Peter; but I can also be rather cheap PEEK is very expensive but I have this nagging personality flaw that tells me, "save the PEEK for something that is worthy". At my estate sale, there are going to be some great bargains on expensive stuff I've been saving for some special motorcycle.

  10. #10
    Join Date
    Nov 2008
    Location
    new britain pa
    Posts
    3,200

    Re: piston buttons

    What’s wrong with bronze?

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