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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Series ‘C’ Comet Camshafts
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<blockquote data-quote="timetraveller" data-source="post: 104287" data-attributes="member: 456"><p>Hello Patrick, I do not understand some of the figures on your degree wheel. The value of the inlet closing at 90 deg and opening at 36 deg do not seem correct. The opening is about right but the closing should be about 64 deg whether it is a Mk I or a Mk II. If I take your figures of inlet opening, 36 deg, and exhaust closing at 34 deg then that gives an overlap value of 70 deg and that value for a Mk I cam should be in the range of 68 to 75. I think that you have a Mk I cam (or a Mk III which has the same timing but is supposed to have quieting ramps). The racing cam for Grey Flashes and Black Lightings have an overlap value of 105. You should know that over the years there have been some very poor cams made for Vincents and possibly you have one of those. Good luck with the rebuild.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 104287, member: 456"] Hello Patrick, I do not understand some of the figures on your degree wheel. The value of the inlet closing at 90 deg and opening at 36 deg do not seem correct. The opening is about right but the closing should be about 64 deg whether it is a Mk I or a Mk II. If I take your figures of inlet opening, 36 deg, and exhaust closing at 34 deg then that gives an overlap value of 70 deg and that value for a Mk I cam should be in the range of 68 to 75. I think that you have a Mk I cam (or a Mk III which has the same timing but is supposed to have quieting ramps). The racing cam for Grey Flashes and Black Lightings have an overlap value of 105. You should know that over the years there have been some very poor cams made for Vincents and possibly you have one of those. Good luck with the rebuild. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Series ‘C’ Comet Camshafts
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