OMC 18hp parenthood

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  • July 9, 2015 at 2:52 am #1969
    phil-b
    Participant

      Since a number of SD-20 threads have popped up….

      I seem to recall someone (Gary?) saying the OMC 22ci 18hp came as much from the SD as it did the 15hp Fastwin (which originated with the Elto 12hp)….

      The SD has the same bore and stroke as the 18hp Fastwin/FD … Anything else?

      July 9, 2015 at 10:03 am #19724
      1946zephyr
      Participant

        Designs of the OMC crowd was doing a lot of consolidation from 1950 to 1957 That SD model may have been one of the derivatives of the Fastwin, as well as the QD By the mid 50’s, all the twins were one basic design and just different sizes.

        July 9, 2015 at 10:41 am #19727
        frankr
        Participant

          US Member

          I suppose the most significant difference between the SD and 22 cu. in. family of motors is the rotary valve vs. reed plate.

          July 10, 2015 at 4:23 pm #19809
          1946zephyr
          Participant

            I would have to say though, the real parent to the 18, is the 1950 Fastwin 14. 🙂
            it is the earlier 19.94 cid block which also the same displacement as the 15 its likely that the SD had some influence on the larger 18 design

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