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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cams ????
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<blockquote data-quote="timetraveller" data-source="post: 23921" data-attributes="member: 456"><p>Kevin, you need to measure the diameter of the base circle as well. The lift on the valve is a combination of the diameter of the base circle, the height of the lobe and where on the cam follower the cam is touching. I suspect that you will find that the base circle on the new cam is larger than on the old cam and hence the height of the nose of the cam has to be higher to give the correct lift. Sadly, 50 thou of wear off the nose of a cam would not be too unusual. It is also quite common to have to grind a little off the valve lifter if cams with higher noses are fitted. The best way to find out if you have a mark three is to fit it and then do the lift profiles as discussed in these pages a few days ago.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 23921, member: 456"] Kevin, you need to measure the diameter of the base circle as well. The lift on the valve is a combination of the diameter of the base circle, the height of the lobe and where on the cam follower the cam is touching. I suspect that you will find that the base circle on the new cam is larger than on the old cam and hence the height of the nose of the cam has to be higher to give the correct lift. Sadly, 50 thou of wear off the nose of a cam would not be too unusual. It is also quite common to have to grind a little off the valve lifter if cams with higher noses are fitted. The best way to find out if you have a mark three is to fit it and then do the lift profiles as discussed in these pages a few days ago. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cams ????
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