Calling coil experts….!

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  • December 24, 2021 at 12:51 pm #251682
    crosbyman
    Participant

      Canada Member - 2 Years

      with the apparent failure of some Chinese coils what could be wrong with the coils ??? they seem to test good ohm wise (static test) but fail under load

      less tolerant yet blamed for weaken flywheel magnets ?

      less senstive metallurgy of the laminates (cheap steel less conductive to magnetism ? )

      cheap-corrupted copper alloy in the windings causing less current flow when the magnetized cores collapse when points open up ?

      Mr. Mohat ???

      Joining AOMCI has priviledges 🙂

      • This topic was modified 2 years, 4 months ago by crosbyman.
      December 24, 2021 at 5:47 pm #251705
      joecb
      Participant

        US Member - 2 Years

        Could be any of the above mentioned or likely a combination, and additionally poor varnish insulation on the windings.

        Joe B

        December 25, 2021 at 12:04 pm #251736
        opposedtwin
        Participant

          US Member - 2 Years

          I was under the impression that the coils were good but the laminates were lacking? I have removed the laminates from some old, cracked coils with plans to use them with the chinese coils once I run out of the good German ones. Altgough I have not yet bought any chinese coils, I assume eventually they will be our only option
          Scott

          December 25, 2021 at 12:48 pm #251741
          crosbyman
          Participant

            Canada Member - 2 Years

            this week I chucked and older but not cracked one … the HV pin was flopping from infinity to 7 kohms .. as I probed the pin….

            so far that is probably the worst I have seen on non-cracked coils.

            can’t say I had much bad luck with them

            Joining AOMCI has priviledges 🙂

            December 25, 2021 at 5:44 pm #251750
            outboardnut
            Participant

              US Member

              opposedtwin -I believe the Sierra coils are the ones with bad heels

              December 30, 2021 at 2:55 pm #251974
              duprebrad
              Participant

                I am needing a prop shaft seal for a 1957 Elgin 7.5 HP. It is 3/4 inch OD and 1/2 inch ID. About 1/4 inch thick. It looks like multiple manufacturers used the same seal around that time.
                It is held in place by a 1 inch pressed in washer./Users/braddupre/Desktop/IMG_1347 2.jpegIMG_
                See photo below.

                • This reply was modified 2 years, 4 months ago by duprebrad.
                December 30, 2021 at 2:57 pm #251975
                duprebrad
                Participant

                  [

                  December 30, 2021 at 3:09 pm #251979
                  crosbyman
                  Participant

                    Canada Member - 2 Years

                    duprebrad…. this topic is for coils you should open a separate topic on seals….

                    but just fyi here is a list of seal size and numbers

                    Joining AOMCI has priviledges 🙂

                    • This reply was modified 2 years, 4 months ago by crosbyman.
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