Elto Handitwin coil

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  • October 15, 2019 at 11:03 pm #185379
    carl barcus
    Participant

      Is the Elto Handitwin 4357 secondary coil really a continuous coil with no ground connection(only plug attachments for each plug)? I assume in that case the plug connections are at each end of the winding. It seems to me the secondary is actually 2 coils with a connection to ground.. Can anyone refer me to a complete instruction on how to replace the coil with a modern coil? Thanks for all the help–Carl.

      October 16, 2019 at 5:40 am #185381
      lyks2tinkr
      Participant

        US Member - 2 Years

        The secondary on those coils are isolated from ground.
        Both plugs fire at the same time.
        Have you measured the secondary resistance of the coil?
        I believe they should check in the 3 to 5k ohm range.
        If the coil is bad you can place an ad in webvertize for an exact replacement or there are new dual output coils available that can be adapted for use.

        October 16, 2019 at 10:24 am #185386
        garry-in-michigan
        Participant

          Lifetime Member

          YES! – it IS a single winding. The common ground is through the base of the spark plugs. If you ground one plug wire, you will have twice the voltage at the other plug wire. A good coil will jump a half inch gap between the ends of the two high voltage wires. Holding a wire in each hand while someone cranks the motor will burn out your pacemaker . . .

          October 16, 2019 at 2:10 pm #185412
          jeff-register
          Participant

            US Member - 2 Years

            Carl,
            everyone is correct, one winding with the two ends connected to your spark plugs (2). Once the points open the energy stored in the primary winding transfers to the secondary winding. Now it’s charged the energy is looking for the easiest path to ground. It could be either plug which has a little less resistance & goes to ground. The other plug “sees” less resistance ( thru the arc) & goes to ground too. Happens in a micro second.
            Garry is correct! I used these dual fire coils in my Mercury motor because stock ones are not available . I grounded one of the secondary outputs as I’m firing just one plug. Again 50% less resistance gave me 50% more energy for a very hot spark.

            October 17, 2019 at 11:16 am #185452
            The Boat House
            Participant

              October 17, 2019 at 4:49 pm #185500
              The Boat House
              Participant

                https://youtu.be/bpT9MRgZa58

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