Electronic ignition conversions???

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  • MarkAllan
    Senior Member
    • Aug 2023
    • 11

    Electronic ignition conversions???

    I hear some people talking about converting there Atomic 4 to electronic ignition. I cannot find anything about that here can someone direct me to some information about this please.
  • Dave Neptune
    Afourian MVP, Professor Emeritus
    • Jan 2007
    • 5099

    #2
    Our host sell a Pertronics unit that is very good and Indigo also offer a good one of a different style. The Pertronics is a magnetic (hall effect) switch and the Indigo is a photo optic switch. Both are good.
    If you do switch which I always encourage do pay attention to getting the proper coil for the EI.

    Dave Neptune

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    • Antibes
      Senior Member
      • Jun 2011
      • 122

      #3


      Pretty straight forward to do and less to worry about

      Comment

      • tenders
        Afourian MVP
        • May 2007
        • 1452

        #4
        Maybe the most useful upgrade per dollar you can do on an A4. It's an entirely different level of reliability than the points and condenser system.

        With it, you replace the cap and rotor every few years, the wires after every few caps and rotors, and never think about the ignition.

        Comment

        • goodoldboat
          Senior Member
          • May 2017
          • 130

          #5
          Ei upgrade

          Is there any benefit in engine performance with EI over points anc condenser
          S/V Gosling
          Westport CT .

          “Believe me, my young friend, there is nothing - absolutely nothing - half so much worth doing- as simply messing about in boats.”
          ― Kenneth Grahame

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          • joe_db
            Afourian MVP
            • May 2009
            • 4542

            #6
            Originally posted by goodoldboat View Post
            Is there any benefit in engine performance with EI over points anc condenser
            Mostly good EI vs. bad points. The engine is a slow turning low compression engine, the points ignition works fine, except when it doesn't.
            Joe Della Barba
            Coquina
            C&C 35 MK I
            Maryland USA

            Comment

            • Dave Neptune
              Afourian MVP, Professor Emeritus
              • Jan 2007
              • 5099

              #7
              goodoldboat, there is really no "gain" in performance when fresh and set perfectly. However the down side to points is that from the moment they are installed they begin to wear out. As the point assembly wears it changes the "dwell" which affects saturation of the coil affecting the spark and timing, this results in a steady decline in performance until once again they are replaced and properly set. Another down side is that in these old distributors the "cam" becomes warn out over time and proper setting becomes more difficult and requires a dwell gage to set up correctly. The weaker spark also causes more deposits in the cap so replacement of the rotor and cap is required more often.

              With the EI the dwell and timing do not change so the spark remains strong and everything lasts far longer. The big plus though is that once set you can leave it alone for many years. The cap, rotor and plugs last many times longer so far less maintenance is required to maintain excellent unchanging spark performance.

              Dave Neptune

              Comment

              • tenders
                Afourian MVP
                • May 2007
                • 1452

                #8
                In terms of performance tuning I feel as though the only real engine tweak to make is adding the adjustable main jet, which makes the carb run more efficiently and gives you somewhat better fuel efficiency.

                Everything else I can think of is a maintenance reducer or reliability improver, or adjusts something other than the engine (like the three-bladed A4 prop).

                (Is adding an O2 sensor a performance tweak?)

                Comment

                • joe_db
                  Afourian MVP
                  • May 2009
                  • 4542

                  #9
                  Originally posted by tenders View Post
                  In terms of performance tuning I feel as though the only real engine tweak to make is adding the adjustable main jet, which makes the carb run more efficiently and gives you somewhat better fuel efficiency.

                  Everything else I can think of is a maintenance reducer or reliability improver, or adjusts something other than the engine (like the three-bladed A4 prop).

                  (Is adding an O2 sensor a performance tweak?)
                  The biggest performance improvement would be a reduction gear, otherwise we have 20-25 hp engines more or less.
                  Last edited by joe_db; 09-14-2023, 06:19 AM.
                  Joe Della Barba
                  Coquina
                  C&C 35 MK I
                  Maryland USA

                  Comment

                  • sastanley
                    Afourian MVP
                    • Sep 2008
                    • 7035

                    #10
                    advance plate :-)

                    I will chime in here with one more thing since this happened to me:

                    Even though maintenance is greatly reduced using EI over points..when you DO open up the cap/rotor, don't forget to lubricate the advance weights under the EI plate. This is part of the routine when you are regularly replacing points, but easy to forget with almost maintenance free EI.
                    -Shawn
                    "Holiday" - '89 Alura 35 #109
                    "Twice Around" - '77 C-30, #511 with original A-4 & MMI manifold - SOLD! (no longer a two boat owner!!)
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