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Jun 15, 2014 2:55 pm
Jun 15, 2014 2:55 pm
Subject: Re: Coil ignition
I mentioned I had recently trouble with the magneto ignition (BTH GA4) on my 2ltr LC. During a drive it failed and only gave some rare misfiring. I did put my spare coil ignition in instead (I now also have the adaptor piece to be able to use the clamp of the magneto without change). It has no advance-retard options but worked fine to bring me home. The complete unit (without the distance piece adaptor which I made from wood and painted black) is supplied by club member John B29.
Later with the magneto on the living room table I found the simple and stupid reason: the contact breaker distance had become to small (below 0.2mm) and the cam-ring which is operated by the advance-retard lever had some play and probably had tilted a bit (a fraction of a mm). So the spark was erratic. Bringing the gap back to 0.3mm (12 thou) it is working perfectly well again. When playing with the magneto, I saw that the spark when turning it slowly by hand was much stronger than from the coil ignition. I like the magneto and keep the coil in the car just in case.
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I mentioned I had recently trouble with the magneto ignition (BTH GA4) on my 2ltr LC. During a drive it failed and only gave some rare misfiring. I did put my spare coil ignition in instead (I now also have the adaptor piece to be able to use the clamp of the magneto without change). It has no advance-retard options but worked fine to bring me home. The complete unit (without the distance piece adaptor which I made from wood and painted black) is supplied by club member John B29.
Later with the magneto on the living room table I found the simple and stupid reason: the contact breaker distance had become to small (below 0.2mm) and the cam-ring which is operated by the advance-retard lever had some play and probably had tilted a bit (a fraction of a mm). So the spark was erratic. Bringing the gap back to 0.3mm (12 thou) it is working perfectly well again. When playing with the magneto, I saw that the spark when turning it slowly by hand was much stronger than from the coil ignition. I like the magneto and keep the coil in the car just in case.
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