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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Unsteady Idle
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<blockquote data-quote="oexing" data-source="post: 136359" data-attributes="member: 1493"><p>Simon, I´d say Lucas was stuck in prewar thinking way too long and didn´t accept the idea of placing their ATD at the contact breaker cam - like was done in car distributors or Bosch , Magneto Marelli magnetos etc . . Advancing the complete rotor is a lot more troublesome than just the little cb cam as was done many years before WW 2 on car distributors. </p><p> Even so, I´d think the Lucas device should be modifyable to reasonable smooth operation by keeping it well lubricated in places and experimenting a bit with springs - two different types, weak and strong possibly. </p><p> A very different approach when having the ATD in the magneto drive like Lucas was worked out in the Scintilla/Ronco/Vertex magnetos which I got for the Rapides - not an easy mod here. They went for a variety of weights in different shapes , no springs in there at all. By selecting different weights you can do variations of ATD curves. There must be files for these somewhere but I did this by experimenting on a variable speed motor. [ATTACH=full]41024[/ATTACH][ATTACH=full]41025[/ATTACH]</p><p></p><p> Vic</p></blockquote><p></p>
[QUOTE="oexing, post: 136359, member: 1493"] Simon, I´d say Lucas was stuck in prewar thinking way too long and didn´t accept the idea of placing their ATD at the contact breaker cam - like was done in car distributors or Bosch , Magneto Marelli magnetos etc . . Advancing the complete rotor is a lot more troublesome than just the little cb cam as was done many years before WW 2 on car distributors. Even so, I´d think the Lucas device should be modifyable to reasonable smooth operation by keeping it well lubricated in places and experimenting a bit with springs - two different types, weak and strong possibly. A very different approach when having the ATD in the magneto drive like Lucas was worked out in the Scintilla/Ronco/Vertex magnetos which I got for the Rapides - not an easy mod here. They went for a variety of weights in different shapes , no springs in there at all. By selecting different weights you can do variations of ATD curves. There must be files for these somewhere but I did this by experimenting on a variable speed motor. [ATTACH type="full"]41024[/ATTACH][ATTACH type="full"]41025[/ATTACH] Vic [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Unsteady Idle
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