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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Timing
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<blockquote data-quote="Big Sid" data-source="post: 37486" data-attributes="member: 2781"><p>If I may offer a few thoughts on ignition timing , etc . It's best to have the timing at full retard set at around 4 to 6 degrees BTDC to start the burning early enough promote build up of the pressure in the cylinder to give a healthy thrust on the piston for a firm rotation on the idle beat on the down side . Its believed that the burning process continues for about the same distance down the power stroke as it was on the rising side after the initial plug firing . Think about that . </p><p> And with the engine idling there exists a plume of fire out the exhaust port for a distance of 8 to 10 inches which retreats back into the cylinder as the the motor speeds up and the ign. advance comes on line . This explains the bluing of exhaust pipes if allowed to tick over at a slow idle for up to that distance or more . Some new Vincents had very thin exhaust pipes which would begin glowing brightly if allowed to idle for a few minutes . My own new Rapide would do this . Scared me that first time ! Almost bright enough to look transparent , like I could see right through the pipe . Sid .</p></blockquote><p></p>
[QUOTE="Big Sid, post: 37486, member: 2781"] If I may offer a few thoughts on ignition timing , etc . It's best to have the timing at full retard set at around 4 to 6 degrees BTDC to start the burning early enough promote build up of the pressure in the cylinder to give a healthy thrust on the piston for a firm rotation on the idle beat on the down side . Its believed that the burning process continues for about the same distance down the power stroke as it was on the rising side after the initial plug firing . Think about that . And with the engine idling there exists a plume of fire out the exhaust port for a distance of 8 to 10 inches which retreats back into the cylinder as the the motor speeds up and the ign. advance comes on line . This explains the bluing of exhaust pipes if allowed to tick over at a slow idle for up to that distance or more . Some new Vincents had very thin exhaust pipes which would begin glowing brightly if allowed to idle for a few minutes . My own new Rapide would do this . Scared me that first time ! Almost bright enough to look transparent , like I could see right through the pipe . Sid . [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Timing
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