Re: Mag Question

Posted by Phil Auten (TX) on July 17, 2000 at 05:18:25 from (206.175.72.226):

In Reply to: Mag Question posted by Brian Schmidt on July 15, 2000 at 20:20:41:

Brian,
It is also possible that the mag has been converted to a distributor ignition. I have one tractor that has been converted and it works, but of course is not original. Either type of ignition will work, the choice is up to you which one you want to keep.
Here's a brief rundown on how both types of ignitions work:
The mag has a spring loaded impulse coupling built in to assist with starting. It's function is to make the spark hotter at cranking speeds and it is no longer employed once the engine is running. It will make an audible click as the engine is rotated by hand. The impulse trips at the exact time needed to cause the magnets in the bottom of the mag to rotate quickly past the small coil of wire that is the primary side of the ignition circuit. The current induced into the primary is then interrupted by the points opening. This causes the magnetic field arount the primary coil to collapse immediately. The collapsing magnetic field induces a current in the secondary winding of the cignition coil which creates the spark voltage for the plug.
The battery ignition works in a similar way, but the points carry current from the battery through the primary side of the ignition coil, building up a magnetic field until the points open, causing the rapid collapse of the magnetic field which induces the spark voltage in the secondary winding of the ignition coil.
The battery ignition is quite a bit simpler which explains the conversion of many mags to battery ignition, or their replacement with a battery ignition distributor.

Hope this is helpful,
Phil

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