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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Seeking Ignition Suggestions For Twin - Can't Get The ATD Fitted
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<blockquote data-quote="oexing" data-source="post: 174054" data-attributes="member: 1493"><p>I remember early reports when electronic ignitions were new, on old gear the engines did not like the very short sparks from CDI types. With less than perfect mixture they were not well suited to ignite the mixture. So a means was to have wider spark gaps for a longer spark . Extra high tension was no problem to achieve but the longer spark duration from the capacitor-coil system plus breaker could not be had from CDI . So for me I want a spark I can hear loud and clear, not something that is barely visible to the naked eye - high tension or not. When that crack is not loud enough I do not have much faith in its stored energy. </p><p> As to stuck flyweights in the Lucas ATD, possibly a misconception: </p><p> The ATD is the driving component for the armature, so when you move these flyweights they are supposed to drive/move the armature at same time. BUT in two positions of the armature it will be locked by magnetic forces. So you will feel resistance in flyweights when you move them as you try to shift the armature from the magnet locked position. When you turn the engine over the flyweights will most likely return to retarded with ease - hopefully, unless the components are really stuck somehow. </p><p> The ATD on the drive end is not great I believe, quite some forces on it from rotor mass and all. Better go for ATDs on the breaker end that just deal with the breaker cam. So then a distributor is the best way for the Vincent twins I think, to go with coil ignition and its fat sparks. You can do an electronic mod on these for binning the breaker, at low costs without the magnetic complications. </p><p></p><p> Vic</p></blockquote><p></p>
[QUOTE="oexing, post: 174054, member: 1493"] I remember early reports when electronic ignitions were new, on old gear the engines did not like the very short sparks from CDI types. With less than perfect mixture they were not well suited to ignite the mixture. So a means was to have wider spark gaps for a longer spark . Extra high tension was no problem to achieve but the longer spark duration from the capacitor-coil system plus breaker could not be had from CDI . So for me I want a spark I can hear loud and clear, not something that is barely visible to the naked eye - high tension or not. When that crack is not loud enough I do not have much faith in its stored energy. As to stuck flyweights in the Lucas ATD, possibly a misconception: The ATD is the driving component for the armature, so when you move these flyweights they are supposed to drive/move the armature at same time. BUT in two positions of the armature it will be locked by magnetic forces. So you will feel resistance in flyweights when you move them as you try to shift the armature from the magnet locked position. When you turn the engine over the flyweights will most likely return to retarded with ease - hopefully, unless the components are really stuck somehow. The ATD on the drive end is not great I believe, quite some forces on it from rotor mass and all. Better go for ATDs on the breaker end that just deal with the breaker cam. So then a distributor is the best way for the Vincent twins I think, to go with coil ignition and its fat sparks. You can do an electronic mod on these for binning the breaker, at low costs without the magnetic complications. Vic [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Seeking Ignition Suggestions For Twin - Can't Get The ATD Fitted
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