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News and On This Day
David Tompkins Vincent at Daytona
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<blockquote data-quote="medat727" data-source="post: 150138" data-attributes="member: 1982"><p>Greg, the Class C Foot shift class is production-based machines of the period that existed up to and including 1951. My chief competition comes from a pre-war Norton Manx ridden by Alex McLean who is a rare talent indeed, the David Dunfey motor combined with a serious effort to lighten the bike has made the machine a superior mount. When I run against Alex’s modern Manx in the Classic Sixties 500 class which is my bump up class, I get my head handed to me although I do have success against the Triumph Daytona’s and lesser riders on late model Manxs.</p><p></p><p>I too have a later generation Terry Prince head that is slated to be used in an upcoming race engine, it will have to be modified to run as a 500 along with addressing other issues so I’m quite interested in what you are doing with yours. I’m curious about your decision to go with 50 degree seat angles, I believe stock Vincent valves are 30 degrees which give good low lift flow but don’t seal as well as a 45 degree seat, 50 degrees from what I read really only comes into play with high lift flow?</p></blockquote><p></p>
[QUOTE="medat727, post: 150138, member: 1982"] Greg, the Class C Foot shift class is production-based machines of the period that existed up to and including 1951. My chief competition comes from a pre-war Norton Manx ridden by Alex McLean who is a rare talent indeed, the David Dunfey motor combined with a serious effort to lighten the bike has made the machine a superior mount. When I run against Alex’s modern Manx in the Classic Sixties 500 class which is my bump up class, I get my head handed to me although I do have success against the Triumph Daytona’s and lesser riders on late model Manxs. I too have a later generation Terry Prince head that is slated to be used in an upcoming race engine, it will have to be modified to run as a 500 along with addressing other issues so I’m quite interested in what you are doing with yours. I’m curious about your decision to go with 50 degree seat angles, I believe stock Vincent valves are 30 degrees which give good low lift flow but don’t seal as well as a 45 degree seat, 50 degrees from what I read really only comes into play with high lift flow? [/QUOTE]
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David Tompkins Vincent at Daytona
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