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  1. #1
    ou812's Avatar
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    WSM, CP and OEM quick visual comparison.

    Here's a few pics I took of the New WSM pistons vs CP and OEM.. WSM is stamped W4224.

    The pistons will be obvious. Check out the skirt length on the CP's.


    WSM vs CP
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  2. #2
    ou812's Avatar
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    WSM vs OEM 4Tec
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  3. #3
    Bob 1tommygunner1927's Avatar
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    Do the next step, weigh each one.

    Also, notice that the WSM does not have the anti detonation groove, whereas the CP and stock piston does.

  4. #4
    race jase's Avatar
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    Quote Originally Posted by 1tommygunner1927 View Post
    Do the next step, weigh each one.

    Also, notice that the WSM does not have the anti detonation groove, whereas the CP and stock piston does.
    But yet the WSM piston handles deto better than the other 2 piston.
    They work pretty good considering that they are by far the cheapest

  5. #5

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    Quote Originally Posted by race jase View Post
    Quote Originally Posted by 1tommygunner1927 View Post
    Do the next step, weigh each one.

    Also, notice that the WSM does not have the anti detonation groove, whereas the CP and stock piston does.
    But yet the WSM piston handles deto better than the other 2 piston.
    They work pretty good considering that they are by far the cheapest
    That is very surprising to here as using a WSM piston in a performance 951 is suicide, as the 1st hint of deto and the piston blows out the exhaust port.

  6. #6
    Bob 1tommygunner1927's Avatar
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    Quote Originally Posted by race jase View Post
    Quote Originally Posted by 1tommygunner1927 View Post
    Do the next step, weigh each one.

    Also, notice that the WSM does not have the anti detonation groove, whereas the CP and stock piston does.
    But yet the WSM piston handles deto better than the other 2 piston.
    They work pretty good considering that they are by far the cheapest
    Do you have datalogs or some form of documentation to support that claim?

  7. #7
    ou812's Avatar
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    Guess we'll have to run them & see.... I will tell you this, I didn't like the wrist pin clips. They were much easier to put in and seemed weak but were deep in the groove.

  8. #8
    boost junkie skidoochris's Avatar
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    ya who has the balls to test how much deto your piston can take...lol

  9. #9
    Joe Stang's Avatar
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    TO be honest, I had no idea WSM even made a forged piston for the 4tecs. I just happened to be scrolling through my dealer catalog and stumbled upon them. My distributor had a few in stock so I ordered one thinking, if its junk Ill just send it back. Im eally blown away by t he quality of the piston. I know in the past couple of years WSM has stepped their game up with the quality of their pistons all around. I ordered up 2 more. Im running these pistons in my 2012 rxpx racer right now. The only way you'll know if they work is by using them. ET 70-145 charger and 9200 rpms and the ski runs and sounds great. I feel very safe using these pistons, and at the price you can get a set for, you cant beat it!

  10. #10
    ricky86's Avatar
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    i believe les cooke also uses them (wsm pistons) in his turbo boats so they must be a good piston if he uses them.

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