Correct Firestone condenser MFD rating?

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  • May 13, 2015 at 1:57 am #1474
    Buccaneer
    Participant

      US Member

      My 50 Firestone 5 hp has the Phelon magneto # F189J
      with condensers that mount horizontal.
      Anyone have info on what mfd. rating the condensers are?
      I looked at some Merctronic info I had, but I could not find
      what I wanted. The info listed Scott Atwater’s of the same vintage
      as my Firestone, but they appear to use the Wico magnetos with the vertical
      mount condensers.
      Thanks, Bucc

      Prepare to be boarded!

      May 13, 2015 at 3:17 am #15839
      legendre
      Participant

        If they are like 99% of all other marine, motorcycle, automotive and small-engine condensers, they’re 0.22uF @ 630V (AC). The voltage rating is approximate, but 630V should be a very acceptable figure.

        May 13, 2015 at 4:11 am #15842
        frankr
        Participant

          US Member

          My Merc-o-Tronic manual gives the wico ratings listed by wico part number. I see numbers in the list anywhere between 0.1 to 0.34 MFD. What is your Wico number (stamped on the end of the condenser)?

          May 13, 2015 at 8:48 am #15847
          Mumbles
          Participant

            Don’t these mags use the same Phelon coils as used in Mercs? If so, the ratings are .14 to .18 uF or .15 to .19 uF.

            May 13, 2015 at 1:11 pm #15853
            Buccaneer
            Participant

              US Member

              Coils are not like Mercury’s. Didn’t look on the actual condenser
              yet to see if there’s any numbers, but good idea.
              Here’s my mag………
              http://grayhitandmiss.com/Outboards/dscn4911.jpg

              Prepare to be boarded!

              May 13, 2015 at 8:36 pm #15875
              jeff-register
              Participant

                US Member - 2 Years

                Mumbles,
                I agree, both used the same caps.

                May 13, 2015 at 9:12 pm #15880
                Buccaneer
                Participant

                  US Member

                  Looked at one of the condensers today and there were no markings
                  or numbers of any kind on them. Found a old Prestolite chart
                  showing my Firestone takes their condenser 2-5035…..
                  not that "that" helps, lol.

                  Prepare to be boarded!

                  May 13, 2015 at 10:39 pm #15882
                  frankr
                  Participant

                    US Member

                    OK, here ya go.. F189J mag uses FG-471 condensers, and capacity is 0.12-0.16 mfd

                    May 13, 2015 at 10:57 pm #15883
                    Buccaneer
                    Participant

                      US Member

                      Awesome, Thanks Frank!

                      Prepare to be boarded!

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