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F22 Counter measure pistons??

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    #1

    F22 Counter measure pistons??

    Has anyone heard of F22 counter measure pistons?
    I found some 85mm pistons at work and was told they are a counter measure to eliminate the well known F series piston slap.

    Obvious external differences were - A black coating on the skirts - I assume some sort of teflon coating.
    And the biggest difference - low dish. Which means they should be higher compression depending on wrist pin height.

    I'll have to grab a set next week and see what I find, and post some pics.

    Also of note in this thread:
    Has anyone fitted F20 Sohc pistons/rods to an F22?
    F20 pistons (low dish) were 9.0:1 compression for memory.

    F22A1 rods (centre of wrist pin to center of rod journal) are 140mm long.
    F20A3 rods (centre of wrist pin to center of rod journal) are 145mm long.


    Car Safety / General Servicing Checks --------Basic suspension checks

    My 5.7 LS1 Holden Ute

    A "Finished" project car is never finished until its been sold.

    If at first you don't succeed, Try again. Don't give up too easily, persistance pays off in the end.
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    #2
    so the f20 will be out of the hole 5mm?

    never heard of counter measure but the teflon coating is a good thing.
    I <3 G60.

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      #3
      Originally posted by wed3k View Post
      so the f20 will be out of the hole 5mm?

      never heard of counter measure but the teflon coating is a good thing.
      Work has been crazy this week, so I completely forgot to grab a set.

      I'll have to confirm how far the the F20's stick out when I build the new F22, but yes in theory they will stick out 5mm, which takes me back to an OLD thread debate about using 4G63 pistons in the F22 and them being 4mm too short. I have to recheck that thread to confirm weather it was too short or too high.
      I can't understand how it's been over 15 years and only just hearing of a counter measure piston now


      Car Safety / General Servicing Checks --------Basic suspension checks

      My 5.7 LS1 Holden Ute

      A "Finished" project car is never finished until its been sold.

      If at first you don't succeed, Try again. Don't give up too easily, persistance pays off in the end.

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        #4
        Perhaps its weight is on the rotating side?
        So it rides along on side of the cylinder wall?
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          #5
          Originally posted by CB7Man View Post
          Perhaps its weight is on the rotating side?
          So it rides along on side of the cylinder wall?
          Are you referring to the reason behind piston slap?
          Piston slap occurs because the pistons are actually oval not round.


          Car Safety / General Servicing Checks --------Basic suspension checks

          My 5.7 LS1 Holden Ute

          A "Finished" project car is never finished until its been sold.

          If at first you don't succeed, Try again. Don't give up too easily, persistance pays off in the end.

          Comment

            #6
            I've never heard piston slap on any stock f22

            Either way, I think the pistons would be in the hole. The compression of the f20 may be 9:1, but that could be due to it's stroke/rod length and not so much the piston.

            And the DSM pistons DO lay in the hole quite a bit. This can be offset by using H22 rods.

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              #7
              really? it sounds like a diesel in the morning.

              cb7man is talking about the weight of the piston may be offset so it can counter the power of the crank. notice when you look at the cylinder, one side will wear more than the other side.

              which is why putting k series pistons are controversial because they spin the other directiopn.
              I <3 G60.

              0.5mm Oversized Stainless valves and bronze guides available. Pm me please.

              Comment

                #8
                Originally posted by d112crzy View Post
                I've never heard piston slap on any stock f22

                Either way, I think the pistons would be in the hole. The compression of the f20 may be 9:1, but that could be due to it's stroke/rod length and not so much the piston.

                And the DSM pistons DO lay in the hole quite a bit. This can be offset by using H22 rods.
                All f-series I've seen have it, Some are worse than others. But they all have it.

                Originally posted by wed3k View Post
                really? it sounds like a diesel in the morning.

                cb7man is talking about the weight of the piston may be offset so it can counter the power of the crank. notice when you look at the cylinder, one side will wear more than the other side.

                which is why putting k series pistons are controversial because they spin the other directiopn.
                I see now.


                Car Safety / General Servicing Checks --------Basic suspension checks

                My 5.7 LS1 Holden Ute

                A "Finished" project car is never finished until its been sold.

                If at first you don't succeed, Try again. Don't give up too easily, persistance pays off in the end.

                Comment

                  #9
                  Both of my F22s (A1 and an A4) have piston slap. They sound like diesels on startup, and I know it's not my valves, because I recently adjusted them.
                  Originally posted by sweet91accord
                  if aredy time i need to put something in cb7tuner. you guy need to me a smart ass about and bust on my spelling,gramar and shit like that in so sorry.

                  Comment

                    #10
                    Originally posted by evil_demon_01 View Post
                    which takes me back to an OLD thread debate about using 4G63 pistons in the F22 and them being 4mm too short. I have to recheck that thread to confirm weather it was too short or too high.
                    It can be done. I guy around here is doing it. he has a thread on h-t I think.
                    spin city

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