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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Mark. III Camies in `53 Shadow - What is right timing?
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<blockquote data-quote="Tom Gaynor" data-source="post: 23908" data-attributes="member: 4034"><p>Thanks, Sebastian. I have a good Bavarian friend, Reinhardt Neumair, who races a Manx Norton. When I retired, he was leading me in the "European Classic Racing Broken Collar Bone" championship. I last saw him in A & E at Chimay. He had just broken his for the 15th time, I was catching up, I had thought, with my 3rd... </p><p>Remember two things:</p><p>Firstly, PEI designed the Mark II, Lightning, Rollie Free, cams "by eye". Designing cams, taking into account follower geometry, by manual calculation, is a BIG job. Few "oldtime" cams meet modern standards, although they often work very well. Details of how the Lightning cams were "designed" are in his autobiography. They had intended to have it done by a cam design specialist but ran out of time.</p><p>Secondly, the timed breather was dropped for the Series D. This was probably NOT because the timed breather was 100% satisfactory... Opening up the slot with a file to extend the timing helps. But a D breather, I believe, works better.</p><p>Incidentally, my enthusiasm for the "equal lift" method comes from my discovery that my 90 mph Rudge Ulster cam is equal lift (EL) at 4 degrees, my Manx Norton cams were EL at 4 degrees, my factory Honda race (HRC) cam was EL at 4 degrees, and my Gary Robinson 105 (a Vincent Mark II with more overlap) cam was also EL at 4 degrees. And according to Neville Higgins, so is the Terry Prince TPV cam. Must mean something...</p><p></p><p>Good luck anyway. And I hope your wife enjoyed her dinner as much as you enjoyed your temporary freedom from matters domestic...</p></blockquote><p></p>
[QUOTE="Tom Gaynor, post: 23908, member: 4034"] Thanks, Sebastian. I have a good Bavarian friend, Reinhardt Neumair, who races a Manx Norton. When I retired, he was leading me in the "European Classic Racing Broken Collar Bone" championship. I last saw him in A & E at Chimay. He had just broken his for the 15th time, I was catching up, I had thought, with my 3rd... Remember two things: Firstly, PEI designed the Mark II, Lightning, Rollie Free, cams "by eye". Designing cams, taking into account follower geometry, by manual calculation, is a BIG job. Few "oldtime" cams meet modern standards, although they often work very well. Details of how the Lightning cams were "designed" are in his autobiography. They had intended to have it done by a cam design specialist but ran out of time. Secondly, the timed breather was dropped for the Series D. This was probably NOT because the timed breather was 100% satisfactory... Opening up the slot with a file to extend the timing helps. But a D breather, I believe, works better. Incidentally, my enthusiasm for the "equal lift" method comes from my discovery that my 90 mph Rudge Ulster cam is equal lift (EL) at 4 degrees, my Manx Norton cams were EL at 4 degrees, my factory Honda race (HRC) cam was EL at 4 degrees, and my Gary Robinson 105 (a Vincent Mark II with more overlap) cam was also EL at 4 degrees. And according to Neville Higgins, so is the Terry Prince TPV cam. Must mean something... Good luck anyway. And I hope your wife enjoyed her dinner as much as you enjoyed your temporary freedom from matters domestic... [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Mark. III Camies in `53 Shadow - What is right timing?
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