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Magnet strength

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Loon Yi

12-16-2004 18:28:24

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Does anyone know how to gauge the strength of the horseshoe magnet on an F4 magneto? I know I can see how strong the spark is after I finish putting it back together, but it would be handy to know, for example, how much weight a properly charged magnet can lift. TIA

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John in NE.

12-16-2004 22:59:27

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Re: Magnet strength in reply to Loon Yi, 12-16-2004 18:28:24

I had one re-charged last spring by an older gentleman in Grand Island Ne. with a machine he had bought at an auction for fifty cents because nobody knew what it was.Before re-charging it,a pretty hefty effort was needed to pull a wrench from it.After re-charging it, it was very difficult to remove a wrench from it.I also learned that the IHC emblem (stamp) is on the north pole of the magnet,and that you should always remove what-ever is stuck to it from the south pole first.He had a small lathe set up to test magnetos and there was a noticable differance in the spark. John.

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Ed Topel

12-16-2004 20:59:41

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Re: Magnet strength in reply to Loon Yi, 12-16-2004 18:28:24

I once recharged an F4 magnet using a block of cast iron about 40 lbs.as the keeper. After recharging I put the block on a scale and watched the scale as I lifted the block by the magnet. The scale was reading about 15lbs when the magnet broke free so I took it to be 25lbs. pull. I put the magnet back on the block and tried again and only got 15lbs. pull. I guess this is why you should slide the keeper off the magnet and not pull it straight off after charging. Probably about 6 years ago I posted instuctions for winding wire around the magnet and using a battery to energize it but I can't find it in the archives.I think I still have the sketch I made to show how to wind the wire to get the correct polarity, I could e-mail that to you.Ed

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Jim Becker

12-17-2004 07:33:12

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Re: Magnet strength in reply to Ed Topel, 12-16-2004 20:59:41

Never tested this theory, but . . .

When the magnet gets charged, the keeper is charged at the same time (may not hold the charge as well as the magnet). If you then test the pull required to separate the magnet from the keeper, the magnetism remaining in the keeper should add to the pull required. If you put the keeper back on and don't get the same exact spot, you won't get the full strength of both magnets added together. Make sense?

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Ed Topel

12-17-2004 10:18:34

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Re: Magnet strength in reply to Jim Becker, 12-17-2004 07:33:12

You could be right, I never thought about that. I was putting the magnet back in the center of the block but I am sure it wasn't exactly in the same spot.

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Loon Yi

12-16-2004 22:34:27

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Re: Magnet strength in reply to Ed Topel, 12-16-2004 20:59:41

I would appreciate it if you could send those jnmcc_at_yahoo.com of course replace the _at_ with the @ symbol. Thank you.

I cant find anyone local and I will see how it works before sending out to get the magnet charged.

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Nebraska Cowman

12-16-2004 19:31:10

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Re: Magnet strength in reply to Loon Yi, 12-16-2004 18:28:24

I don't know. I'm not convinced that a magnet has to be super strong to produce a good spark.

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Bob

12-16-2004 19:46:37

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Re: Magnet strength in reply to Nebraska Cowman, 12-16-2004 19:31:10

With a given coil, spark strength is definitely proportional to magnet strength.

I had a good Allen magnet charger until I lost it in a shop fire some years ago, and it was amazing how much magnet recharging would help a magneto.

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Bob

12-16-2004 18:59:24

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Re: Magnet strength in reply to Loon Yi, 12-16-2004 18:28:24

You mention you've had it apart, which can only hurt it's magnetism.

Bottom line is MOST LIKELY a magnet recharge would make for a hotter spark.

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Loon Yi

12-16-2004 19:01:49

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Re: Magnet strength in reply to Bob, 12-16-2004 18:59:24

I stuck it on a big block of steel so it shouldnt get any weaker.

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