Re: How Important is OMC Ignition Timing?

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May 18, 2015 at 6:18 pm #16361
legendre
Participant
    quote wbeaton:

    quote legendre:

    This is the issue, and it’s why you can’t use a light or buzz-box – neither can really tell the difference between 0 and 1 ohms….

    If you’re using a continuity light or buzz-box, there’s no discernible difference between 0 and 1 (zero and one) ohms – either state will illuminate the lamp or buzz the box.

    Nonsense. Buzz boxes are used to set airplane magnetos so you can be assured it’ll work just fine on an outboard. The buzz box won’t make any noise until the moment the points open.

    Totally different situation. Compare the wiring diagram for one of these OMC magnetos to that of your aircraft magneto, and you’ll quickly realize the difference. Also, look at the pics in Mumbles’ post, just above mine – the difference between open & closed points is only 0.7 ohms!

    Your typical continuity tester will regard anything below a few ohms as a closed-circuit. One example, the continuity ‘beep’ on one of my meters has a 100 ohm threshold, IIRC. That would never work for one of these OMC mags.. it would just beep continuously. See the issue?