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Old 30-03-18, 04:14 PM   #571
skankin_giant
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Hmmm magnetos packed up.... recently been put in a new shed but don't think it suffered that bad in the old shed, the magneto was rebuilt around 2012 and those much older are still fine.
Not getting any resistance reading from the slip ring, so not sure if something is a miss, might need to take it off and have a look at it..... just hoping the coil hasn't packed up that quick...
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Old 30-03-18, 04:37 PM   #572
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7 years is about the recommended life for a coil though they will probably go on much longer. Shellac can absorb water over time so even an unused coil can “expire” before it has been unwrapped. I’m overhauling a pair of 12 cylinder mags at the moment, they received new coils 15 years ago and have been unused since. They now need coils again.. a coil which lives in a damp shed will have a shorter life.

Phill.

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Old 30-03-18, 05:37 PM   #573
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I'd certainly expect a professionally rebuilt mag to last longer than that.

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Old 30-03-18, 09:49 PM   #574
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Quote:
Originally Posted by nickh View Post
I'd certainly expect a professionally rebuilt mag to last longer than that.

NHH
So would I! I'm sure that I have seen guarantees of 10 years quoted but I may be mistaken. That said, I fully understand that any magneto associated with aviation would be subject to strict conditions.

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Old 30-03-18, 10:07 PM   #575
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I am sure now resin is used instead of shellac and a vacuum is used to to impregnate the coil, so they should last forever.

I have had coils rewound but some that I haven't would be original and 100 years old. Moisture is not good for magnetos, but even so I know some of my engines have spent a long time outside before I got them and the magneto coils are still good.

Merv.
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Old 30-03-18, 10:28 PM   #576
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Quote:
Originally Posted by mervyn cloake View Post
I am sure now resin is used instead of shellac and a vacuum is used to to impregnate the coil, so they should last forever.


Merv.
That should read, resin can be used, either two part or thermo setting.
It can be impregnated by vacuum.
It seems to me a lot of coils are rewound by amateurs working at home, and no matter how skilled they may be, they not have a vacuum pot, or indeed a suitable oven.

Neil.
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Old 30-03-18, 11:04 PM   #577
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Being too lazy to read through the 60 pages, who rebuilt the Mag?
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Old 30-03-18, 11:07 PM   #578
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Quote:
Originally Posted by adgecutler View Post
Being too lazy to read through the 60 pages, who rebuilt the Mag?
I'm sure it's not there work, misuse by me I would say.
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Old 31-03-18, 12:51 AM   #579
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Quote:
Originally Posted by Hornet 6 View Post
That should read, resin can be used, either two part or thermo setting.
It can be impregnated by vacuum.
It seems to me a lot of coils are rewound by amateurs working at home, and no matter how skilled they may be, they not have a vacuum pot, or indeed a suitable oven.

Neil.
If you want to be pedantic that is OK I am talking Professionally wound coils!!!

Last edited by mervyn cloake; 31-03-18 at 12:54 AM.
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Old 31-03-18, 10:51 AM   #580
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Quote:
Originally Posted by mervyn cloake View Post
If you want to be pedantic that is OK I am talking Professionally wound coils!!!
Not pedantic at all, just realistic.
I can't think of a single business anywhere near here that would even contemplate rewinding an ignition coil these days.
Personally I would vacuum impreg with thermo setting resin/varnish. But I have an impreg pot and a vacuum pump.

Neil.
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