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GWGAllisfan

Ignition question

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GWGAllisfan
We’ve discussed this question in length in the other direction, but what would happen if an engine that had points, converted to Magnetron, and the flywheel was re-polarized, was re-equipped with a points coil and the points used again. What does this do to the magnetic field? Also is there any way to tell what polarity the flywheel you have is? Maybe with a compass?

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MrSteele
Just thinking out loud, but. A compass might tell you the answer. But, would it work to turn the mag 180 degrees if the flywheel was repolarized? The mag would not know if it was on wrong, would it? And, in this position, it would be working correctly as it was designed to work, would it not? You sound like a tinkerer. Do any of your other hobbies involve clock or watch repair? I'll try anything nearly, at least once, and if it doesn't work, try something different to see what it does another way.

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D-17_Dave
I'll admitt on this one that Im no exspert. That said it's my understanding that the magnetic field passing by the magneto will energize the mag. Then when the points break it will release this energy. So I don't think a standard points mag. would care whitch way the polarity is on the flywheel as opposed to a magnetron equiped mag. where it requires a certain polarity first. Judgeing by the shroud mods on your B-10 I dought the flywheel has had it's pol. swapped.

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GWGAllisfan
I am a bit of a tinkerer, hoping that's a good thing. I think it's a bit of my make-up to want to know all I possibly can about the theory of something before I try mess with it for fear I will make a bad situation worse. Also I'm trying to learn to solve problems with thought and logic rather than just throwing money at it like I used to.:D Dave, I was thinking the same thing about the coil and the polarity, just wasn't sure. I agree that I doubt that the flywheel was re-polarized on the B-10, since whoever had cut the shroud to change the coil wasn't real likely to have known about that. I haven't even had time to take it off the trailer yet.

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HubbardRA
I think I agree with Dave also, even though I am no expert on magnetos either. Since the points have been eliminated on a magnetron, the system needs something to indicate to the ignition when to fire. It is my understanding that this is the reason for the re-polarization - provide a means of generating a firing signal to the ignition. If this is the case, then the older style ignition with points should work fine on a re-polarized flywheel, since it will be tripped by the points and will just ignore the additional magnetic pulse from the flywheel. If I am way off-base, then I, myself, would like to know the specific details of the re-polarization.

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