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How points ignition system works.

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  • #1
    PLEASE REFER TO THE POST AT THE END OF THIS TOPIC FOR THE DOWNLOADABLE POWER POINT DISPLAY...

    Re: How does the Ignition work? (Sticky candidate?)

    Really nice.

    Would really appreciate the addition of two other unknowns for many.

    Dwell, and resistors/resistor wires/points would close out the picture for many.

    Lots and lots of thanks. I think this may be a great way to help build up knowledge, a "library" of info.
    Last edited by achris; June 25th, 2014, 05:50 PM.

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    • #2
      Re: How points ignition system works.

      Outstanding job!
      1989 Baja Sport 250, 454 Mag, Bravo One
      I never learned much from winning, but always learn from failure.
      Semper Fi

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      • #3
        Re: How points ignition system works.

        Will make this a sticky for a while so most get a chance to read it. I will also be putting it in the Adults Only sticky. Good job Bubba
        Don S.


        Please, no PM's (Private Messages) regarding boat/engine problems.
        That is what the forums are for.
        Only forum/moderator issues will be answered in PM's.

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        • #4
          Sign up today
          Hi All,

          Due to the upgrade, the original post with the power point display for this thread was mislaid. The IT team have found it and given me the link, so I will post it here...

          ---------------------------------------------------------------------------------------------------------------

          http://www.4shared.com/document/5yhb...on_System.html

          ---------------------------------------------------------------------------------------------------------------

          As for "Dwell", that is merely the time (in degrees of crankshaft rotation) that the points remain closed. Effectively, the smaller the dwell, the larger the points gap, the longer the dwell, the smaller the points gap. From the pps display and this knowledge, you can see that the points need to stay closed for long enough for the coil to charge (magnetic field saturated). To small a dwell and the coil will not be fully charged, and the spark will be weak. Too long a dwell and the points will burn as they open (gap too small to avoid a hard arc)...

          The resistance wire is to limit the current flowing through the coil. Coils are designed to work at 7 volts, so the resistance ( discreet or as a wire) is not reducing the performance of the coil. The bypass wire from the stater to the coi + is to provide a full kick to the coil as the engine is cranking. Often the battery voltage will be down around 9 or 10 volts and so the coil voltage through a resistance will also be down, often as low as 5 volts, which would cause a weak spark. And at cranking is when the engine does require a good strong spark.

          Hope this all helps.

          Chris...

          EDIT: 13/6/15. If that link is not behaving, try this one.

          Power Point PSS
          Last edited by achris; June 12th, 2015, 07:39 AM.
          xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
          The world takes on a whole new perspective when viewed from 100’ below.
          1972 Bertram ‘Bahia Mar’ 20
          2006 Mercruiser 4.3MPI (0W617679) w/Alpha One Gen II (0W829301)
          (Original - 1972 '165' In-line 6. Previous - 1994 4.3LX)


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