Magneto With Coil Added Static Timing?

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ctltmp
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Magneto With Coil Added Static Timing?

Postby ctltmp » Sun Jul 26, 2020 7:06 am

I wanted to check that my instinct is correct since it's my first time dealing with this. A 47 cub with a magneto and obviously the coil in the mag went bad or had some other issue. The owner just added a 6v coil to overcome that.

Is there any need to static time it now since the impulse from the mag doesn't fire the ignition? My instinct tells me no, just set to #1 tdc and drop the mag in to #1 plug.

I've never had this setup and don't plan on rebuilding the mag any time soon.

Thanks in advance!
WV Mike

Eugene
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Re: Magneto With Coil Added Static Timing?

Postby Eugene » Sun Jul 26, 2020 7:21 am

You still need to static time the magneto.

The impulse coupling fires the coil at TDC. Once the tractor's reaches 250 RPMs the impulse coupling drops out and the magneto goes to 13 degrees advance.
I have an excuse. CRS.

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MiCarl
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Re: Magneto With Coil Added Static Timing?

Postby MiCarl » Sun Jul 26, 2020 5:41 pm

Timing it has nothing to do with the magneto or impulse coupler. It's so the points open at the proper time. The points open when the impulse coupler snaps over so it's a convenient way to set the timing.

You could also do it with a timing light but you'd have to crank it over by hand because as Eugene said at 250rpm the timing advances and there isn't a mark on the pulley for timing it when that happens.
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k hutchins
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Re: Magneto With Coil Added Static Timing?

Postby k hutchins » Sun Jul 26, 2020 6:54 pm

If it were me, l would just spend the time and money and replace the original mag coil. That's me, l'm a bit of a traditionalist. Plus l enjoy being able to start by crank if the battery is dead.
Why is there never enough time to do the job right, but always enough time to do it over. :?:

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ctltmp
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Joined: Thu Jul 14, 2016 6:39 am
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Tractors Owned: 1949 Farmall Cub
1947 Farmall Cub
1954 Farmall Cub
Location: New Cumberland, WV

Re: Magneto With Coil Added Static Timing?

Postby ctltmp » Sun Jul 26, 2020 9:51 pm

My plan was to rebuild the mag. The own6in their infinite wisdom however pulled half the parts out of it when the removed the coil in the mag.
WV Mike


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