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General Chat (Vincent Related)
alscomet with unmarked timing gears
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<blockquote data-quote="timetraveller" data-source="post: 1527" data-attributes="member: 456"><p>You could do what Mr Boggler suggests but that will only work if you know what cam profiles you have and if they have been made correctly. Many Vincent cams are not accurate. An alternative is to do most of what Mr B suggests but near TDC on the correct stroke accurately determine the lift profiles and arrange it so that the cross over from inlet opening to exhaust closing is about 4 to 6 degrees BTDC. That is degrees of inlet opening larger than degrees of exhaust closing. For my own purposes I always plot the whole lift curve of both cams and then draw a line at five thou. lift across the base of the curves. Determine the timing of these points and then find the best compromise with the figures given in Paul Richardson's book. This way you can overcome some of the deficiencies in Vincent cam profiles. I also suggest that you nip up 5 to 6 thou. before doing all this and check the base circle for circularity. I have seen cams with 20 to 30 degree flats on their base circles and if you set up the tappet clearance on that part you will have trouble later.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 1527, member: 456"] You could do what Mr Boggler suggests but that will only work if you know what cam profiles you have and if they have been made correctly. Many Vincent cams are not accurate. An alternative is to do most of what Mr B suggests but near TDC on the correct stroke accurately determine the lift profiles and arrange it so that the cross over from inlet opening to exhaust closing is about 4 to 6 degrees BTDC. That is degrees of inlet opening larger than degrees of exhaust closing. For my own purposes I always plot the whole lift curve of both cams and then draw a line at five thou. lift across the base of the curves. Determine the timing of these points and then find the best compromise with the figures given in Paul Richardson's book. This way you can overcome some of the deficiencies in Vincent cam profiles. I also suggest that you nip up 5 to 6 thou. before doing all this and check the base circle for circularity. I have seen cams with 20 to 30 degree flats on their base circles and if you set up the tappet clearance on that part you will have trouble later. [/QUOTE]
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alscomet with unmarked timing gears
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