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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

Webster L 3 bar magneto


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  #1  
Old 02-06-2019, 03:33:11 PM
BV071747 BV071747 is offline
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Default Webster L 3 bar magneto

Webster L 3 bar Magneto
I hear the term “wiping the magnets”. What does that term mean and how do you do it. Also, when magnets have been demagnetized by improper placement or because they were put on the charger wrong, how can this problem be corrected?
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Bruce VB
Tekonsha MI
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Old 02-07-2019, 12:20:09 PM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: Webster L 3 bar magneto

Wiping is an old term for magnetizing a steel object by drawing it across a maknet pole. It was commonly done with screw drivers to keep steel screws on the bit. It can also mean completely de-magnetizig the magnets so that have no magnetism at all, by installing reversed on the charger and activating it to erase all magnetism. If magnet polarity was reversed or the magnets charged individually, then they must be 'wiped' - brought back to no charge and then be re-charged as an assembly. If the magnets have differing rates of 'charge', the differential will cause them to lose their magnetism until all 3 eventually equalize, or nearly so. Not good for the mag! It will cause the magnets to weaken quickly/



As for the 3 magnet assembly on the tripolar - The magnets should be charged as a nested set - all 3 magnets set inside one another as mounted on the mag core. All magnets should be like pole to like pole - all North on one side, all south on the other If you assemble them N-S-N, the poles will cancel each other, and the mag will not work. To identify the poles,, use a compass to identify the poles. Nest then like to like, and then tie a string or small rope around the centers and suspend about 2" above your charger. Energize your charger and the magnets will self align to the charger. DO NOT DROP THE MAGNETS! You will need to pillow block the magnet assembly, so that the bases of all 3 magnets come in contact with the magnet charger poles. THEN mount the magnets on the charger and apply current. Lightly rap the magnet assembly with a BRASS hammer, in order to help set the magnetic lines of force in the magnets. I would apply charge current at least 3 times for a duration of at least 30 seconds each. THEN place steel keepers on each side of the magnets and slip off the charger. As you assemble the magnets onto the mag core, slip the keepers off. Once the magnets are in place, you are set. If you have a very strong charger (professional), you can charge the magnets on the core itself. It is better for the mag if you do that.

To check your Webster L for coil performance, disconnect the springs to the armature and spin the mag at about 500 RPM. Using an AC voltmeter, set at the 30 volt scale, you should read 11.5 volts approximately at a minimum, after magnet re-charge. if voltage is lower than that, you may have either a dirty connection or a bad coil.
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Old 02-08-2019, 12:57:07 AM
cobbadog cobbadog is offline
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Default Re: Webster L 3 bar magneto

That was very well explained, thank you.
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Old 02-08-2019, 07:33:42 AM
BV071747 BV071747 is offline
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Default Re: Webster L 3 bar magneto

Thanks Andrew
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Old 02-08-2019, 11:57:10 AM
Dan Baalman Dan Baalman is offline
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Default Re: Webster L 3 bar magneto

Andrew 30 seconds? Man I have charged probably a hundred magnetos and two or three three second bursts never fails, and I learned from an old ignition guy who started his shop in the twenties. But what ever works. I also never charge the magnets off the mag, never had it work very well.
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Old 02-08-2019, 03:47:32 PM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: Webster L 3 bar magneto

Charging the old Webster magnets takes time for maximim saturation of the magnetic lines of force. I know my charger is not the best, so maximum time under current is used. The magnets can be charged off the mag, BUT - you MUST use a keeper on BOTH sides of the magnets in order to maintain 'charge. If the magnets are removed without a keeper, they can lose up to 60% of their magnetism within seconds! Been there done that. You tend to learn a lot from experiance! Of course, it is better yo recharge the tripolar mag as an assembly, but the weaker home made chargers often do not provide the saturation needed on the mag. The keepers are slid off the magnets as you slide them onto the magneto core.

As i stated earlier, nested magnets on the Webster mags must be charged as an assembly, not individually. They are assembled like pole to like, both in the 2 magnet and 3 magnet versions. There must be pole piece contact with all magnets, using 'dead iron' pillow blocks to make contact. Dead iron is soft iron metal that will transmit magnetic force but will not retain any magnetism itself. It has no magnetic memory like a true magnet. With other brands that mount their magnets side by side, these too must be charged at the same time, also like pole to like, so as not to bring out a disparity of charge.
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