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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Magneto polarity
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<blockquote data-quote="Magnetoman" data-source="post: 50927" data-attributes="member: 2806"><p>It's something else altogether. The simple answer is the capacitors being sold for this are not rated to survive the high pulsed currents they will experience in a magneto. I describe this in a sidebar on magneto condensers in the following post:</p><p></p><p><a href="http://www.britbike.com/forums/ubbthreads.php?ubb=showflat&Number=455839#Post455839" target="_blank">http://www.britbike.com/forums/ubbthreads.php?ubb=showflat&Number=455839#Post455839</a></p><p></p><p>Unlike the condensers on older cars that were made as cheaply as possible because they were easy to access and would be replaced as a regular maintenance item along with worn points, the internal condensers for rotating armature magnetos were made to last "forever" in a magneto. In the case of pre-WWII mica condensers forever what pretty much forever, but for post-WWII paper condensers forever was a few decades. The reasons these post-WWII condensers slowly, but inevitably, die are described in:</p><p></p><p><a href="http://www.britbike.com/forums/ubbthreads.php?ubb=showflat&Number=466579#Post466579" target="_blank">http://www.britbike.com/forums/ubbthreads.php?ubb=showflat&Number=466579#Post466579</a></p><p></p><p>However, I conducted accelerated stress tests on appropriate modern replacement capacitors that are rated for high pulsed currents and identified two that will last "forever." These tests and the capacitors are described at:</p><p></p><p><a href="http://www.britbike.com/forums/ubbthreads.php?ubb=showflat&Number=467734#Post467734" target="_blank">http://www.britbike.com/forums/ubbthreads.php?ubb=showflat&Number=467734#Post467734</a></p><p>and</p><p><a href="http://www.britbike.com/forums/ubbthreads.php?ubb=showflat&Number=508762#Post508762" target="_blank">http://www.britbike.com/forums/ubbthreads.php?ubb=showflat&Number=508762#Post508762</a></p><p></p><p>For the first capacitor <em>"...my conservative estimate is there is a very high probability these Panasonic capacitors will function without failure in a magneto for at least 140,000 miles or 40 years."</em> For the second one, <em>"Although these tests were not as extensive as the ones I conducted on the Panasonics... Taken in combination with the manufacturer's specifications, and the fact they have the same internal polypropylene structure as the Panasonics, I would have no hesitation using them myself if I did not already have a very large stock of the Panasonics."</em></p></blockquote><p></p>
[QUOTE="Magnetoman, post: 50927, member: 2806"] It's something else altogether. The simple answer is the capacitors being sold for this are not rated to survive the high pulsed currents they will experience in a magneto. I describe this in a sidebar on magneto condensers in the following post: [url]http://www.britbike.com/forums/ubbthreads.php?ubb=showflat&Number=455839#Post455839[/url] Unlike the condensers on older cars that were made as cheaply as possible because they were easy to access and would be replaced as a regular maintenance item along with worn points, the internal condensers for rotating armature magnetos were made to last "forever" in a magneto. In the case of pre-WWII mica condensers forever what pretty much forever, but for post-WWII paper condensers forever was a few decades. The reasons these post-WWII condensers slowly, but inevitably, die are described in: [url]http://www.britbike.com/forums/ubbthreads.php?ubb=showflat&Number=466579#Post466579[/url] However, I conducted accelerated stress tests on appropriate modern replacement capacitors that are rated for high pulsed currents and identified two that will last "forever." These tests and the capacitors are described at: [url]http://www.britbike.com/forums/ubbthreads.php?ubb=showflat&Number=467734#Post467734[/url] and [url]http://www.britbike.com/forums/ubbthreads.php?ubb=showflat&Number=508762#Post508762[/url] For the first capacitor [I]"...my conservative estimate is there is a very high probability these Panasonic capacitors will function without failure in a magneto for at least 140,000 miles or 40 years."[/I] For the second one, [I]"Although these tests were not as extensive as the ones I conducted on the Panasonics... Taken in combination with the manufacturer's specifications, and the fact they have the same internal polypropylene structure as the Panasonics, I would have no hesitation using them myself if I did not already have a very large stock of the Panasonics."[/I] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Magneto polarity
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