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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin Valve Timing
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<blockquote data-quote="davidd" data-source="post: 55803" data-attributes="member: 1177"><p>I have never liked the Vincent way of measuring cam timing. Measuring 5 thou or 2 thou seems so wrong. I have almost always used dial indicators on the rocker arm, mostly because the ufm was on. The ratio of the rocker should be 1:1. I think for most it is difficult to have brackets that hold the dial indicator properly and the rocker does "rock", as opposed to the top of the valve stem. But, knowing this should help keep you on track.</p><p></p><p>The diagram in Richardson's showing all the pinion marks lined up was done at 4 degrees BTDC on the exhaust stroke. I use digital dial indicators because it is easier to spot the crossover point. If you can do this and the crossover point is good, the inlet should be opening at 47 with the weird instructions. I would just run through the strokes again and record the openings and closings at 0.040" and 0.050" so you have a record of what the timing is according to industry standards. You may not care, but this will allow you to compare your cam timing to all other cam timings. </p><p></p><p>I think it was ABCD that posted some good information on the 105 when I incorrectly stated it was the lobe separation angle. As I remember it is the maximum lift that occurs at 105 degrees.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 55803, member: 1177"] I have never liked the Vincent way of measuring cam timing. Measuring 5 thou or 2 thou seems so wrong. I have almost always used dial indicators on the rocker arm, mostly because the ufm was on. The ratio of the rocker should be 1:1. I think for most it is difficult to have brackets that hold the dial indicator properly and the rocker does "rock", as opposed to the top of the valve stem. But, knowing this should help keep you on track. The diagram in Richardson's showing all the pinion marks lined up was done at 4 degrees BTDC on the exhaust stroke. I use digital dial indicators because it is easier to spot the crossover point. If you can do this and the crossover point is good, the inlet should be opening at 47 with the weird instructions. I would just run through the strokes again and record the openings and closings at 0.040" and 0.050" so you have a record of what the timing is according to industry standards. You may not care, but this will allow you to compare your cam timing to all other cam timings. I think it was ABCD that posted some good information on the 105 when I incorrectly stated it was the lobe separation angle. As I remember it is the maximum lift that occurs at 105 degrees. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin Valve Timing
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