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did i recieve wrong size pistons?? help!!

Discussion in 'Engine Building' started by word, Feb 21, 2004.

  1. word

    word Senior Member

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    hey,
    i just bought some wiseco 84.5mm pistons. when i measure their diameter with a ruler they come out to be around 3.26 inches, which is 82.8mm (1.7mm off) is this correct or did i recieve the wrong ones?

    thanks a bunch
    chris
     
  2. Slammed90Lude

    Slammed90Lude Senior Member

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    aren't they for a cylinder with a diameter of 84.5mm?

    i think that the .17mm your missing with the ruler is for rings
     
  3. Swift Tuner

    Swift Tuner Member

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  4. xj0hnx

    xj0hnx I wanna be sedated VIP

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    3.26" is 82.806mm which is a difference of 1.694mm which is 0.0666929"s.

    You really shouldn't use words like "about" in conjunction with trying to come up with measurements that small.
     
  5. Slammed90Lude

    Slammed90Lude Senior Member

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    and you shouldn't be using a ruler either-
     
  6. lsvtec

    lsvtec GNU/Linux Evangelist

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    You cannot trust the measurements you are getting from a ruler to be that accurate. Have a machine shop measure them and then see (unless you have the proper tools to measure them yourself).
     
  7. jamesA

    jamesA Well known pissed off telephone guy VIP

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    I'm with him...but he's not stupid... like the sign would say. Go buy a 20 dollar micrometer and use those measurements so you won't have to say "about."
     
  8. word

    word Senior Member

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    i know i can't measure the piston diameter exactly with the naked eye, but i DO know that the pistons aren't 84.5mm in diameter. are the left over space for the rings is basically what i'm asking?

    thanks
    chris
     
  9. Slammed90Lude

    Slammed90Lude Senior Member

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    yeah but bro, how do you know that you're measuring exactly across the diameter of the piston if you're using a ruler?
     
  10. word

    word Senior Member

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    i'm measuring the piston on the bottom side, and the distance from one end to the other of the diameter is the longest distance anywhere in the circle.
     
  11. lsvtec

    lsvtec GNU/Linux Evangelist

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    Take them to a machine shop, they will be able to tell you if these are the right pistons.
     
  12. 2 litre EG

    2 litre EG Senior Member

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    i agree... no matter how you are measuring them, without a micrometer or a machine shop then you wont be able to be accurate... and accuracy is a huge thing when it comes to piston size, clearance and such

    B)
     
  13. pissedoffsol

    pissedoffsol RETIRED

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    read the box :D if it was sealed, and it sasy 84.5mm, i got $5 on it being 84.5mm pistons
     
  14. 2 litre EG

    2 litre EG Senior Member

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    mayan i pray that was the first thing he did!
     
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