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are these pistons ETA pistons ! if so im pissed

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    are these pistons ETA pistons ! if so im pissed

    i need to know the wear on these pistons are normal



    Last edited by e30m20TurbO7; 06-03-2012, 05:59 PM.

    #2
    If you are talking about the scuff marks on the skirts, yes.

    What is important is whether there is wear in the ring grooves.
    The car makes it possible, but the driver makes it happen.
    Jim Levie, Huntsville, AL

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      #3
      thanks i paid 100 bucks shipped
      good price??

      Originally posted by jlevie View Post
      If you are talking about the scuff marks on the skirts, yes.

      What is important is whether there is wear in the ring grooves.

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        #4
        Yes, if the ring grooves aren't worn.
        The car makes it possible, but the driver makes it happen.
        Jim Levie, Huntsville, AL

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          #5
          how do you check your ring grooves
          ?


          Originally posted by jlevie View Post
          Yes, if the ring grooves aren't worn.

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            #6
            i would use a micrometer to measure the wear on the skirts and the ring lands.

            you should be able to find specs online.
            -FREEDOM- is cruisin at 80, windows down and listening to the perfect song-thinking "this is it"
            -The Beauty in the Tragedy-
            MECHANIC SMASH!!- (you all know you do it)
            Got Drop?? ;-)
            Originally posted by JinormusJ
            But of course
            E30s are know to be notoriously really really really ridiculously good looking

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              #7
              Originally posted by e30m20TurbO7 View Post
              how do you check your ring grooves
              ?
              The first step is a visual examination after cleaning. The edges of the grooves should be sharp. Then then you measure the width of the grooves with a gap micrometer at several points around the piston and compare that to the spec.
              The car makes it possible, but the driver makes it happen.
              Jim Levie, Huntsville, AL

              Comment


                #8
                thank you
                for the help because im gonna need it doing this all on my own

                Originally posted by jlevie View Post
                The first step is a visual examination after cleaning. The edges of the grooves should be sharp. Then then you measure the width of the grooves with a gap micrometer at several points around the piston and compare that to the spec.

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                  #9
                  they look fine to me. but yes id check them out after they have been cleaned.

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                    #10
                    Not having an inside mic that small, I use a feeler gauge on the old rings-
                    if it's not way out, I spring for new rings, and check again.
                    A few thou over the max spec doesn't seem to cause a problem.

                    That said, I've only come across a few sets that weren't so worn in the skirts as to be unusable.
                    But I buy junk to start with.

                    t
                    now, sometimes I just mess with people. It's more entertaining that way. george graves

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                      #11
                      Yes, they certainly look like ETA pistons. That's a lot of wear in my book. 3 of them are pretty scored.
                      "I'd probably take the E30 M3 in this case just because I love that little car, and how tanky that inline 6 is." - thecj

                      85 323i M TECH 1 S52 - ALPINEWEISS/SCHWARZE
                      88 M3 - LACHSSILBER/SCHWARZE
                      89 M3 - ALPINEWEISS II/M TECH CLOTH-ALCANTARA
                      91 M TECHNIC CABRIO TURBO - MACAOBLAU/M TECH CLOTH-LEATHER

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                        #12
                        Definitely ETA pistons... did the seller say they were 'i'?

                        I've got my old 'i' pistons laying around here somewhere, can't promise they aren't worn (never go them checked) but I'd let them go cheap. They're just laying around right now.
                        Tinker Engineering - 2014

                        Mica - 2000 BMW 323i - The one that started it all
                        Fiona - 1975 BMW 2002 - The Definition of Project Creep
                        Heidi - 1988 BMW M5 - The piece of BMW history
                        Silvia - 2013 Subaru WRX - Stock, for now

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