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Tech. Advice: Industrial Engines
V-Twin Magnetos
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<blockquote data-quote="Chris Launders" data-source="post: 88291" data-attributes="member: 2010"><p>Magnetoman,</p><p>I understand all the figures you've given me , as I said initially I just trying to cobble together a V twin magdyno for another application and wish to understand a couple of things better.</p><p></p><p>At present I have two good sparks BUT if I move the cam slightly in one direction one spark fades out, and if I move the cam ring slightly in the other direction the brass segment in the slip ring no longer coincides with the pick up, this is because in a magdyno the pickups are 90 degrees out of position compared to a KVF (in relation to the magnets and armature) hence the need for special slip ring with an extended brass segment (I have an article in a Brough technical publication explaining how to convert single cylinder ones to this) which I am doing.</p><p></p><p>What I'm trying find out as I asked initially is it better to have the second spark early or late, irrespective of which cylinder is which.</p><p></p><p>Just a thought here, if I timed the cam the other way with what is currently with the #2 spark as the one at max flux the #1 spark would be 25 degrees early (instead of the current #1 spark at max flux and #2 spark late by 25 degrees)</p><p>When retarded would I have better sparks as the would now be approximately #2 spark say 12 degrees after max flux and #1 spark around 13 degrees before.</p><p>At present they would be #1 spark 12 degrees after max flux and #2 spark 37 degrees after.</p><p></p><p>Chris.</p></blockquote><p></p>
[QUOTE="Chris Launders, post: 88291, member: 2010"] Magnetoman, I understand all the figures you've given me , as I said initially I just trying to cobble together a V twin magdyno for another application and wish to understand a couple of things better. At present I have two good sparks BUT if I move the cam slightly in one direction one spark fades out, and if I move the cam ring slightly in the other direction the brass segment in the slip ring no longer coincides with the pick up, this is because in a magdyno the pickups are 90 degrees out of position compared to a KVF (in relation to the magnets and armature) hence the need for special slip ring with an extended brass segment (I have an article in a Brough technical publication explaining how to convert single cylinder ones to this) which I am doing. What I'm trying find out as I asked initially is it better to have the second spark early or late, irrespective of which cylinder is which. Just a thought here, if I timed the cam the other way with what is currently with the #2 spark as the one at max flux the #1 spark would be 25 degrees early (instead of the current #1 spark at max flux and #2 spark late by 25 degrees) When retarded would I have better sparks as the would now be approximately #2 spark say 12 degrees after max flux and #1 spark around 13 degrees before. At present they would be #1 spark 12 degrees after max flux and #2 spark 37 degrees after. Chris. [/QUOTE]
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Tech. Advice: Industrial Engines
V-Twin Magnetos
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