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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
cams.... and more cams......
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<blockquote data-quote="timetraveller" data-source="post: 31563" data-attributes="member: 456"><p>You will find several people on this forum, including me, who have used MkIIs on the road for years. However, they were intended for racing and the overlap is such that you will get significant blow back from the carburettors below about 4,000 rpm. I used to get 55 - 60 mpg with MkIs and I am lucky to get 40 mpg with MkIIs. They were also intended to run with an open exhaust system!! Either MkIs or MkIII are suitable for normal road use and will give a more tractable engine. The MkIIIs were intended to have quitening ramps to cut down some of the noise but I have never measured a set which had what I would call a 'quieting ramp'. The acceleration, which is what would generate noise, is not very different between these cams. I think that I posted some graphs of the relevant figures on this forum some years ago. Gary Robinson, on the Isleof Wight, makes these cams for the spares company, and assuming that he is still alive and well would probably deal with you direct.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 31563, member: 456"] You will find several people on this forum, including me, who have used MkIIs on the road for years. However, they were intended for racing and the overlap is such that you will get significant blow back from the carburettors below about 4,000 rpm. I used to get 55 - 60 mpg with MkIs and I am lucky to get 40 mpg with MkIIs. They were also intended to run with an open exhaust system!! Either MkIs or MkIII are suitable for normal road use and will give a more tractable engine. The MkIIIs were intended to have quitening ramps to cut down some of the noise but I have never measured a set which had what I would call a 'quieting ramp'. The acceleration, which is what would generate noise, is not very different between these cams. I think that I posted some graphs of the relevant figures on this forum some years ago. Gary Robinson, on the Isleof Wight, makes these cams for the spares company, and assuming that he is still alive and well would probably deal with you direct. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
cams.... and more cams......
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