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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Lucas KVF Rebuild - UK Recommendations?
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<blockquote data-quote="oexing" data-source="post: 178926" data-attributes="member: 1493"><p>Sorry for spoiling the story, but I cannot see what difference face cams could achieve as opposed to common slip rings. This will not achieve a better spark at the "pole position" that does not fit a v-twin at the slightly offset best flux point when having the common 180 degrees type armature. I did a test last night with my stock single mags and manual a/r on them. Definitely the best spark is shown at retard - logically you want best spark when kicking. With going to advanced sparks appear a bit weaker but would not matter in a running engine with higher speeds. </p><p> Certainly with v-twin mags you have to see the whole picture for the other spark plug as well and here I am not quite clear what´s best. You have to have some compromise for getting acceptable sparks from both leads. So I will do some more tests with best flux on the 205 deg position or maybe the 155 deg position - not quite clear to me yet. </p><p> Anyway, advanced or retarded is no factor as ATD is in the drive gear so flux positions are unaffected - but by now I have learned why they had the ATD in the drive gear for v-twins and not at the breaker end: The internal timing would be destroyed for one cylinder with a 180 degrees armature and common mag as it is handcapped by design already on a v-twin. </p><p> I converted 4 cylinder Vertex mags for the v-twin , certainly modded one breaker cam for 205 degrees but had to keep all 4 cams for getting sparks at all. So there will be two waisted sparks under the distributor cap going onto two brass plates for earth but the other active sparks are fat enough in all conditions so experimenting on them is easy, the cams sit on a plain taper so any positions of flux can be tried for best effect on both plugs. This is no headache as the Vertexes show impressive sparks anyway, even spinning them reverse. </p><p></p><p> Vic</p><p>[ATTACH=full]61966[/ATTACH]</p><p></p><p>[ATTACH=full]61967[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 178926, member: 1493"] Sorry for spoiling the story, but I cannot see what difference face cams could achieve as opposed to common slip rings. This will not achieve a better spark at the "pole position" that does not fit a v-twin at the slightly offset best flux point when having the common 180 degrees type armature. I did a test last night with my stock single mags and manual a/r on them. Definitely the best spark is shown at retard - logically you want best spark when kicking. With going to advanced sparks appear a bit weaker but would not matter in a running engine with higher speeds. Certainly with v-twin mags you have to see the whole picture for the other spark plug as well and here I am not quite clear what´s best. You have to have some compromise for getting acceptable sparks from both leads. So I will do some more tests with best flux on the 205 deg position or maybe the 155 deg position - not quite clear to me yet. Anyway, advanced or retarded is no factor as ATD is in the drive gear so flux positions are unaffected - but by now I have learned why they had the ATD in the drive gear for v-twins and not at the breaker end: The internal timing would be destroyed for one cylinder with a 180 degrees armature and common mag as it is handcapped by design already on a v-twin. I converted 4 cylinder Vertex mags for the v-twin , certainly modded one breaker cam for 205 degrees but had to keep all 4 cams for getting sparks at all. So there will be two waisted sparks under the distributor cap going onto two brass plates for earth but the other active sparks are fat enough in all conditions so experimenting on them is easy, the cams sit on a plain taper so any positions of flux can be tried for best effect on both plugs. This is no headache as the Vertexes show impressive sparks anyway, even spinning them reverse. Vic [ATTACH type="full"]61966[/ATTACH] [ATTACH type="full"]61967[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Lucas KVF Rebuild - UK Recommendations?
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