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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Ignition Advance
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<blockquote data-quote="Monkeypants" data-source="post: 128695" data-attributes="member: 2708"><p>Dave, this one made me chuckle.</p><p>We will get through Covid without changing to small carbs.<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p>While the rest of the world is suffering with their petty problems, respiratory and otherwise, we are facing possible carb shrinkage and lost performance!</p><p>But we will soldier through.</p><p></p><p>I'm roughly the same as the others with two plugs - 4 /26 on ignition with 11 to ones and big squish area.</p><p>Those numbers came courtesy Roy Robertson and Bob Dunn.</p><p>Roy has done lots of dyno work with his twin plug racer. He rolled the timing back until he saw power loss and then forward to same.</p><p>He then set the ignition as far retarded as possible, just above the point where power loss occurs.</p><p>Bob Dunn made the suggestion that advance should be fully in by 2000 rpm , or even lower.</p><p>No fancy curve needed or wanted for a Vincent, just a straight steep ramp from 4 degrees to 26.</p><p>Andy at Pazon tailor made the ignition that way and its very good. Andy's suggestion was to use two ignition drivers instead of the usual one. That way there is twice the spark energy of his usual twin plug setup. It also draws twice the current so a good charging system is needed.</p><p>Some say a strong or weak spark, single or twin spark makes no difference but I feel that two hot sparks are preferable to one weak spark, or even one hot spark. Especially for kick starting an 11 to 1cr 1360cc engine.</p><p>If one manages to roll it through compression it's nice to have a couple of big fat sparks cardiovert the thing to life.</p><p>Otherwise I'm the one requiring cardioversion!</p><p></p><p></p><p>Glen</p></blockquote><p></p>
[QUOTE="Monkeypants, post: 128695, member: 2708"] Dave, this one made me chuckle. We will get through Covid without changing to small carbs.:) While the rest of the world is suffering with their petty problems, respiratory and otherwise, we are facing possible carb shrinkage and lost performance! But we will soldier through. I'm roughly the same as the others with two plugs - 4 /26 on ignition with 11 to ones and big squish area. Those numbers came courtesy Roy Robertson and Bob Dunn. Roy has done lots of dyno work with his twin plug racer. He rolled the timing back until he saw power loss and then forward to same. He then set the ignition as far retarded as possible, just above the point where power loss occurs. Bob Dunn made the suggestion that advance should be fully in by 2000 rpm , or even lower. No fancy curve needed or wanted for a Vincent, just a straight steep ramp from 4 degrees to 26. Andy at Pazon tailor made the ignition that way and its very good. Andy's suggestion was to use two ignition drivers instead of the usual one. That way there is twice the spark energy of his usual twin plug setup. It also draws twice the current so a good charging system is needed. Some say a strong or weak spark, single or twin spark makes no difference but I feel that two hot sparks are preferable to one weak spark, or even one hot spark. Especially for kick starting an 11 to 1cr 1360cc engine. If one manages to roll it through compression it's nice to have a couple of big fat sparks cardiovert the thing to life. Otherwise I'm the one requiring cardioversion! Glen [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Ignition Advance
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