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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Valve Timing
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<blockquote data-quote="ClassicBiker" data-source="post: 118497" data-attributes="member: 1632"><p>As I said I timed mine by the 4*BTDC method.</p><p> But others on here have timed their cams to the timing marks on the pinions, using the slots, and then aligned the all the timing marks and called it good. I would suspect for expediency in manufacturing the machines originally, the cams were aligned to the marks on the pinions. Which in turn were align to the marks on the large idler. With the crank in position the and all the marks aligned the half time pinion was the last one to be placed once the assembler determined which key way lined up best with the slot in the crankshaft itself.</p><p>These machines were a mass produced item. So methods were devised to make assembly as quick a process as possible.</p><p></p><p>In these threads the relationship between the dots and slots are outlined.</p><p>[URL unfurl="true"]https://www.vincentownersclub.co.uk/threads/cam-to-cam-wheel-position.10133/#post-95835[/URL]</p><p>[URL unfurl="true"]https://www.vincentownersclub.co.uk/threads/twin-cam-timing-conundrum.9613/#post-90229[/URL]</p><p>So I would be willing to bet that the slots are datums for the manufacturing of the standard cams and that you could time the cams from them.</p></blockquote><p></p>
[QUOTE="ClassicBiker, post: 118497, member: 1632"] As I said I timed mine by the 4*BTDC method. But others on here have timed their cams to the timing marks on the pinions, using the slots, and then aligned the all the timing marks and called it good. I would suspect for expediency in manufacturing the machines originally, the cams were aligned to the marks on the pinions. Which in turn were align to the marks on the large idler. With the crank in position the and all the marks aligned the half time pinion was the last one to be placed once the assembler determined which key way lined up best with the slot in the crankshaft itself. These machines were a mass produced item. So methods were devised to make assembly as quick a process as possible. In these threads the relationship between the dots and slots are outlined. [URL unfurl="true"]https://www.vincentownersclub.co.uk/threads/cam-to-cam-wheel-position.10133/#post-95835[/URL] [URL unfurl="true"]https://www.vincentownersclub.co.uk/threads/twin-cam-timing-conundrum.9613/#post-90229[/URL] So I would be willing to bet that the slots are datums for the manufacturing of the standard cams and that you could time the cams from them. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Valve Timing
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