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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Camshaft
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<blockquote data-quote="timetraveller" data-source="post: 104539" data-attributes="member: 456"><p>I think that it is a Mk I but something has happened to it. I am assuming that nothing is clashing to cause the flat across the top of the inlet valve lift curve (Pat has checked that) and Pat assures me that there is not a deep groove across the cam follower base. What I don't understand is why the cam seems not to show some deformity. Note that we are talking a millimetre in round figures here. The reason I say Mk I is from the timing of opening and closing points. You will see that the cross over point is at TDC whereas there is a general view that 4 deg BTDC is about right. If I assume that Pat could advance the valve timing by 4 deg then the opening and closing points would be at the following values. The figures in brackets are the official Vincent ones for a Mk I.</p><p>Ex.O. 73 BBDC (70 - 72), Ex.C. 26 ATDC (28 - 33), In.O. 50 BTDC (40 - 42). In.C. 63 ABDC (60 - 64)</p><p>In addition the lift on the exhaust is about 8.8mm (0.346") which is more like a Mk I value than a Mk II.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 104539, member: 456"] I think that it is a Mk I but something has happened to it. I am assuming that nothing is clashing to cause the flat across the top of the inlet valve lift curve (Pat has checked that) and Pat assures me that there is not a deep groove across the cam follower base. What I don't understand is why the cam seems not to show some deformity. Note that we are talking a millimetre in round figures here. The reason I say Mk I is from the timing of opening and closing points. You will see that the cross over point is at TDC whereas there is a general view that 4 deg BTDC is about right. If I assume that Pat could advance the valve timing by 4 deg then the opening and closing points would be at the following values. The figures in brackets are the official Vincent ones for a Mk I. Ex.O. 73 BBDC (70 - 72), Ex.C. 26 ATDC (28 - 33), In.O. 50 BTDC (40 - 42). In.C. 63 ABDC (60 - 64) In addition the lift on the exhaust is about 8.8mm (0.346") which is more like a Mk I value than a Mk II. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Camshaft
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