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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Camshaft
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<blockquote data-quote="timetraveller" data-source="post: 105084" data-attributes="member: 456"><p>Grey One is correct with regards to the accuracy one need to have available to do a good job. I, and most people, do not have such equipment and in any case with that kind of measuring accuracy one would want to have a temperature controlled environment. Lacking all that one does the best that one can.</p><p></p><p>The 'horizontal' line referred to by Bruce would be a hand drawn line through the negative parts of the acceleration curves. I do realise that the exhaust is noisy and the inlet has a curve in it but compare these two curves with those obtainable with any of the normal Vincent cams. All the ones I have tested have a gradient along this part of the curve, one gradient for the exhaust and the opposite gradient for the inlet. My understanding, and I do not mind being corrected by an expert, is that this negative part of the curve shows what the valve springs have to try to control and a curve which gives a horizontal straight line is the one to try for. Vincent cams do not satisfy those criteria and these cams are better than the standard cams. Could the curves be improved? Very possibly, but this is what we have at the moment. All I have done is to measure the cams, not designed them so I have no personal bias or vested interest as to their suitability.</p><p></p><p> I do have the facilities for accurately rotating the engine one degree at a time (I have a rotary table clamped to a special nut which fits to the timing side main shaft outboard of the half time pinion). I could probably even arrange to have a stable temperature. Perhaps Grey One would like to lend me a measuring device accurate to a micron or so and I will find the time to do the job as he would wish.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 105084, member: 456"] Grey One is correct with regards to the accuracy one need to have available to do a good job. I, and most people, do not have such equipment and in any case with that kind of measuring accuracy one would want to have a temperature controlled environment. Lacking all that one does the best that one can. The 'horizontal' line referred to by Bruce would be a hand drawn line through the negative parts of the acceleration curves. I do realise that the exhaust is noisy and the inlet has a curve in it but compare these two curves with those obtainable with any of the normal Vincent cams. All the ones I have tested have a gradient along this part of the curve, one gradient for the exhaust and the opposite gradient for the inlet. My understanding, and I do not mind being corrected by an expert, is that this negative part of the curve shows what the valve springs have to try to control and a curve which gives a horizontal straight line is the one to try for. Vincent cams do not satisfy those criteria and these cams are better than the standard cams. Could the curves be improved? Very possibly, but this is what we have at the moment. All I have done is to measure the cams, not designed them so I have no personal bias or vested interest as to their suitability. I do have the facilities for accurately rotating the engine one degree at a time (I have a rotary table clamped to a special nut which fits to the timing side main shaft outboard of the half time pinion). I could probably even arrange to have a stable temperature. Perhaps Grey One would like to lend me a measuring device accurate to a micron or so and I will find the time to do the job as he would wish. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Camshaft
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