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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modern Fuel & Ignition Advance
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<blockquote data-quote="Pete Appleton" data-source="post: 94871" data-attributes="member: 145"><p>DavidD - You mention starting at 40 degrees then backing off to optimum. Are we talking fixed timing or some form of advance curve? My big question is about these systems that seem to advance right up early then go no further. I am assuming that your tuning was done at far more than 2000 revs. So should the advance curve continue beyond 2000 revs?</p><p></p><p>Chris S - The ATD is what started me thinking. It is horribly crude and, effectively, driving the magneto through the bob weights, against springs of indeterminate strength must leave questions about when all of the advance takes place. Are you getting away with 38 degrees because you have good ATD springs? Are those retarding their ignition covering up an ATD that is advancing too early?</p></blockquote><p></p>
[QUOTE="Pete Appleton, post: 94871, member: 145"] DavidD - You mention starting at 40 degrees then backing off to optimum. Are we talking fixed timing or some form of advance curve? My big question is about these systems that seem to advance right up early then go no further. I am assuming that your tuning was done at far more than 2000 revs. So should the advance curve continue beyond 2000 revs? Chris S - The ATD is what started me thinking. It is horribly crude and, effectively, driving the magneto through the bob weights, against springs of indeterminate strength must leave questions about when all of the advance takes place. Are you getting away with 38 degrees because you have good ATD springs? Are those retarding their ignition covering up an ATD that is advancing too early? [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modern Fuel & Ignition Advance
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