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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Ignition Timing 2018
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<blockquote data-quote="oexing" data-source="post: 97103" data-attributes="member: 1493"><p>Bill,</p><p>the purpose of a bike is not to reach full advance at any chosen speed but the target is to get an engine that is happy with its carburation and ignition to operate without undue heat, harshness and vibrations . I cannot tell if 4000 rpm may be optimal for full advance at around 34 degrees or maybe better set the springs for 3500 rpm . That has to be tested on the road or rolling road if you get access. And the setting depends on the state of tune for that particular engine. Anyway the diagram further up that shows 2700 rpm full advance with all available springs and bobweights for the old Lucas ATD is waaay off the marks for modern knowledge. That was OK for old sidevalvers and real low tuned ohv engines. But one model of ATD cannot possibly fit for all types of engines around in their very different state of tune - definitely. It is also a matter of thinking out of the box , look at other machinery and draw one´s conclusions. One need not accept "original" facts and ideas for being the optimum, very often just a result of conditions and knowledges available then.</p><p></p><p> Vic</p></blockquote><p></p>
[QUOTE="oexing, post: 97103, member: 1493"] Bill, the purpose of a bike is not to reach full advance at any chosen speed but the target is to get an engine that is happy with its carburation and ignition to operate without undue heat, harshness and vibrations . I cannot tell if 4000 rpm may be optimal for full advance at around 34 degrees or maybe better set the springs for 3500 rpm . That has to be tested on the road or rolling road if you get access. And the setting depends on the state of tune for that particular engine. Anyway the diagram further up that shows 2700 rpm full advance with all available springs and bobweights for the old Lucas ATD is waaay off the marks for modern knowledge. That was OK for old sidevalvers and real low tuned ohv engines. But one model of ATD cannot possibly fit for all types of engines around in their very different state of tune - definitely. It is also a matter of thinking out of the box , look at other machinery and draw one´s conclusions. One need not accept "original" facts and ideas for being the optimum, very often just a result of conditions and knowledges available then. Vic [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Ignition Timing 2018
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