Piston pin and balancing dilemma!?

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  • Thuppu
    S2Forum Freak
    • Sep 2010
    • 4115
    • Country: Finland

    #16
    Ok, so it's not a disaster? And if I get few grams of the piston and pin the error isn't even that bad...

    Audi UrS4 Avant 2.5 20vt - twincharged - Project
    Audi 80q B4 Sedan 2.2 20vt - Daily user
    BMW 320d Touring e91 M-Sport - Daily user
    BMW 740iA e38 - Project

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    • JP
      S2Forum Extremist
      • Mar 2007
      • 1858
      • Country: United Kingdom

      #17
      Max you will safely take of a piston is 3-4grams which is really not worth the effort.
      UrS6 Stroker + HTA3586 =

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      • Thuppu
        S2Forum Freak
        • Sep 2010
        • 4115
        • Country: Finland

        #18
        Ok, thanks JP. I think I can sleep at nights now.

        Audi UrS4 Avant 2.5 20vt - twincharged - Project
        Audi 80q B4 Sedan 2.2 20vt - Daily user
        BMW 320d Touring e91 M-Sport - Daily user
        BMW 740iA e38 - Project

        Comment

        • Thuppu
          S2Forum Freak
          • Sep 2010
          • 4115
          • Country: Finland

          #19
          Emailed CP-pistons by this issue, and it seems that they can provide 9310 alloy pinns with thinner wall thickness. The JE HD pins has .210 thickness and these CP's has .160 thickness and only 90 gram weight but still good for 5cyl/700hp. Hmm...

          Audi UrS4 Avant 2.5 20vt - twincharged - Project
          Audi 80q B4 Sedan 2.2 20vt - Daily user
          BMW 320d Touring e91 M-Sport - Daily user
          BMW 740iA e38 - Project

          Comment

          • Thuppu
            S2Forum Freak
            • Sep 2010
            • 4115
            • Country: Finland

            #20
            So I did order the CP piston pins. Case hardened and cryo treated 9310 alloy, and they are specsed to 175-200hp/cyl. Should be enough..?

            The pins weight 90 grams, so it's only 6 gram more than my current pins, and 50% of that is only 3 gram. And after I remove all sharp edges of the pistons we are really close to the orginal balancing factor.

            Audi UrS4 Avant 2.5 20vt - twincharged - Project
            Audi 80q B4 Sedan 2.2 20vt - Daily user
            BMW 320d Touring e91 M-Sport - Daily user
            BMW 740iA e38 - Project

            Comment

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