How did Lightwin go from 3hp to 4 hp?

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  • March 10, 2017 at 1:50 am #6499
    wagemaker
    Participant

      If I have this correct, it was 1969 that the Lightwin got an extra hp. It looks to me like the displacement was unchanged.

      March 10, 2017 at 3:16 am #54069
      Mumbles
      Participant

        They have much higher compression for one and probably have a bigger throat in the carb. The one needle bearing on top of the crank would help to.

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        March 10, 2017 at 5:13 am #54075
        PugetSoundBoater
        Participant

          Mumbles, nice compression gauge. Bet it was made in Canada. 🙂

          "Some people want to know how a watch works, others just want to know what time it is"
          Robbie Robertson

          March 10, 2017 at 3:17 pm #54091
          fleetwin
          Participant

            US Member

            Yeah, bore and stroke were unchanged from 69. But, I’m sure the ports and head were different…Bigger intake manifold as well.

            March 10, 2017 at 10:00 pm #54104
            crosbyman
            Participant

              Canada Member

              I am sure we don’t make those things in canada 😆

              Joining AOMCI has priviledges 🙂

              March 10, 2017 at 11:43 pm #54109
              mercuryman
              Participant

                Is you Gage reading PSI , My 1971 4 hp Lightwin reads 90 PSI which is higher than the 3 hp models.

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