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  1. #1
    flyguytki's Avatar
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    I need some immediate help.......

    So for my materials class we have to do a report on something that has failed. I chose to do my pistons out of my 2001 GTX that has a hole blown right through it. I need as much information as possible on the piston itself including the type of metal that they are made out of. No I know it is aluminum but I need to know if there are any specifics on the type of metal used. If anyone has any idea on this could you please help me out. I am a procrastinator so of course this is due tommorow..... lol
    -david


  2. #2
    Nothin' better than Doo'in it! BigDaddyRXP's Avatar
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    Forged aluminum is all I can tell you

    However... I can tell you how the hole was created ...

    If you strike out... go with this material type: 2618-T61 aluminum

  3. #3
    KrunchovXPL-GTX-RX's Avatar
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    I am pretty sure that OE 951 pistons are NOT forged.

    They run the factory clearence at .0035. That is awfully tight for a forged piston.
    Last edited by KrunchovXPL-GTX-RX; 10-19-2009 at 01:44 PM. Reason: Oops, missed a zero.

  4. #4
    Nothin' better than Doo'in it! BigDaddyRXP's Avatar
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    Quote Originally Posted by KrunchovXPL-GTX-RX View Post
    I am pretty sure that OE 951 pistons are NOT forged.

    They run the factory clearence at .035. That is awfully tight for a forged piston.
    .035" is loose as crap

    Forged pistons can run much less bore clearance than cast pistons! On the 800's I could run .0025" piston to bore clearance with stock pistons, and had to run .012" minimum with cast wiseco pistons.

  5. #5
    KrunchovXPL-GTX-RX's Avatar
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    I fixed the post, it is .0035.

    Most guys who run Weiscos (which most certainly are forged) are running them at .008 so .012 would definitely be a larger clearence.

  6. #6
    83Gator's Avatar
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    Not trying to change your mind, but you can always consider doing a report on SC washer failure. There is tons of info/data available on GH...

  7. #7
    Nothin' better than Doo'in it! BigDaddyRXP's Avatar
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    Quote Originally Posted by KrunchovXPL-GTX-RX View Post
    I fixed the post, it is .0035.

    Most guys who run Weiscos (which most certainly are forged) are running them at .008 so .012 would definitely be a larger clearence.
    I haven't had to buy pistons in many years for my 800... thanks to finally buying some good ones... PRO-X But... I went through a handful (actually two) of crappy wiseco pistons... but they were cast back then

  8. #8
    GTXX's Avatar
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    Quote Originally Posted by bigdaddyRXP View Post
    .035" is loose as crap

    Forged pistons can run much less bore clearance than cast pistons! On the 800's I could run .0025" piston to bore clearance with stock pistons, and had to run .012" minimum with cast wiseco pistons.
    bigdaddy, you got it backwards. your stock 800 pistons were cast as are the OEM 951 pistons. Wiseco's are forged pistons and require a good bit more clearance than OE cast as the material expands differently, .0055 is the minimum for forged and you have to baby the break in, .007 is safer.

    flyguy, the piston material is a high silicon content cast aluminum.

  9. #9
    Nothin' better than Doo'in it! BigDaddyRXP's Avatar
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    Quote Originally Posted by GTXX View Post
    bigdaddy, you got it backwards. your stock 800 pistons were cast as are the OEM 951 pistons. Wiseco's are forged pistons and require a good bit more clearance than OE cast as the material expands differently, .0055 is the minimum for forged and you have to baby the break in, .007 is safer.

    flyguy, the piston material is a high silicon content cast aluminum.
    Sorry... it's been a long time since I bought 2 stroke pistons (that's a good thing)! But hell... you meant what I knew

    I ran those damn wiseco's at .012" and still couldn't make them live... I got real tired of having Todd redo my cylinders all the time

  10. #10
    KrunchovXPL-GTX-RX's Avatar
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    Some guys like them...but a lot more do not.

    I just gotta say, that is some world class talent in your avatar pic.

    Flyguy,

    Where is the hole in the piston (as in what part of the piston)? The location gives you a good idea of what killed it and might make for some interesting material for your paper.

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