COIL RESISTANCE

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  • August 29, 2015 at 11:39 am #2387
    tji
    Participant

      Resistance on 1931 lightwin coil on 20K scale is 2.75 .Is that number OK ? Other motors I have are in the 6.6 range. Thanks Tom

      August 29, 2015 at 8:11 pm #22880
      jeff-register
      Participant

        US Member - 2 Years

        I’m not sure of your motor but the resistance is enough to make fire. How much resistance is the primary winding & how good are the magnets. Just compare to a 50’s motor flywheel

        August 30, 2015 at 3:04 pm #22905
        kevinf
        Participant

          I’m assuming that the 2.5 is accoss the secondaries and not secondary to ground or across the primaries. For a coil from an opposed twin with magneto ignition of that age I would expect a good coil to have 6 – 7k ohms plug lead to plug lead and infinite resistance from plug lead to ground. I,ve seen coil with more resistance than the 7k work well.

          August 30, 2015 at 6:56 pm #22922
          jim-moffatt
          Participant

            US Member

            Most good coils are in the range of 1k to 10k or 1 to 10 on a 20k digital meter scale. All values in this range will work fine. Some OMC 30s opposed twin coils have up to 15k and they work fine at that value.

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