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Magnetos, Ignition Coils and Spark Plugs Discussion about magnetos, buzz coils, spark plugs, ignitors and low tension coils.

Magnetos, Ignition Coils and Spark Plugs

1939 Wisconsin AC4S engine


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  #1  
Old 11-17-2009, 05:39:52 PM
Bruner Bruner is offline
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Default 1939 Wisconsin AC4S engine

Hello all I have a 1939 wisconsin ac4s the magneto will not work right and I am to cheap to fix it. With that said I am thinking of mounting a car distributor on it with a coil. I am also going to mount an alternator on it. These are more readily available than the right magneto for this engine cheaper too. Has anyone tried this or know anyone who has. Did it work.
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Nate
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  #2  
Old 11-17-2009, 06:03:54 PM
makoman1860 makoman1860 is offline
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Default Re: 1939 wisconsin ac4s engine

Sorry cant help ya, we typically just fix the magneto and not cobble. Do you have a machine shop to make the required parts?
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Old 11-17-2009, 07:07:33 PM
Tilinghast Tilinghast is offline
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Default Re: 1939 wisconsin ac4s engine

Bruner,
You can probably make the mag work like a distributor by running a car coil through it and using the points and rotor in the mag like a distributor. That way you wouldn't have to disturb anything. I know I've seen it mentioned here on the Stak.
Dave
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Old 11-17-2009, 07:21:36 PM
Bruner Bruner is offline
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Default Re: 1939 wisconsin ac4s engine

I do have someone that can machine the required parts for me. I do not look at it as a cobble job just something to play with the engine is not worth dumping alot of money in. Automotive parts are easy to find not to mention cheaper. I would like to know a little more about useing the magneto with an automotive coil.
Thanks
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Old 11-19-2009, 02:06:17 PM
Dempster Dempster is offline
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Default Re: 1939 wisconsin ac4s engine

Just wire up a regular 6 volt auto ignition coil but be sure to use a ignition resistor between the switch and coil on battery input side to cut voltage down from 12V to 6V or will burn the coil and points up. For negative 12V ground run the negative side of coil to the points and condenser inside the mag. May want to use a higher capacity condenser about .30 - .34 mfd 600V. Run the positve terminal off coil to ignition resistor of at least 1.30 ohms or higher and from there to a switch and the battery + positive post. Ground the battery negative to the engine and distributor or mag. From coil center output will have to run it into the dist cap center post by drilling another hole to run inside the cap to fasten with a screw already there or some way. Bad thing I see about those converted type mags is if they come in for repairs later someone wanting to put it back to a mag is they haven't had bearings serviced or replaced and many times are so worn out just become scrap or parts or the impulse comes apart catching locking up and busting up the whole mag. If you use positve ground on battery reverse the coil leads running + pos to dist side. Another mag fits the AC4 engines was a base mount LH drive Edison Splitdorf model RM-1, spec. 03884 but when I've had those no one wanted them so they got parted out for the cover, points, condenser & coil that also work on a RM-2 mag used on John Deere L tractors. If you using a mag to run like distributor need to disable or remove the impulse pawls also so they aren't catching and that also means could use a mag wired that way of either rotation.
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Old 11-19-2009, 04:19:35 PM
Bruner Bruner is offline
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Default Re: 1939 Wisconsin AC4S engine

Thanks dempster I am curious as to why a 6 volt and not a 12 volt coil. Definately good information before I start. I am going to try to find the splitdorf mag before I do this though. Will the JD L mag work or just the same parts.
Thanks
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Old 11-19-2009, 11:23:22 PM
Dempster Dempster is offline
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Default Re: 1939 Wisconsin AC4S engine

I meant to say use a 12V coil with a resistor that cuts it down to 6V and keeps from burning the points up. If use a 6V coil and 6V battery won't need a resistor on it. The RM-2 mag for JD L is a 2 cylinder mag. RM-1 03884 for a 1 cylinder engine. I got mixed up to answer another Wisconsin question seems like. Your AC4 engine could have also used a Edison Splitdorf RM-4 Spec # 03108. Don't know if I have any of those in LH rotation or not. Didn't have any Wico C4 in LH rotation.
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Old 11-24-2009, 05:41:53 PM
Bruner Bruner is offline
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Default Re: 1939 Wisconsin AC4S engine

Hey thanks for the help runs great better than ever thanks again.
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Old 11-24-2009, 09:34:04 PM
Dempster Dempster is offline
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Default Re: 1939 Wisconsin AC4S engine

Glad you got it running
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