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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Camshaft
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<blockquote data-quote="Deleted member 3831" data-source="post: 105248"><p>TT</p><p>sorry I didn't reply to your query re the difference between cam profile data and how it can be related to lift at the valve. I must stress the graphics are cam lift data only.</p><p>I would not start to work from the cam, but would start from the valve lift design that all my calculations and simulations (both static and dynamic) indicate would be capable of meeting the design performance target. This valve lift design is then processed through the valve train of the engine in question to arrive at the cam, where a profile will be calculated.</p><p>It is of course necessary to have complete data for the valve train, dimensionally and with X and Y co ordinates where appropriate, together with all weights and inertia and stiffness values for the moving components, which will also include full valve spring data , and this can take some considerable time to collect if the data is to be accurate. which it must be.</p><p>With some engines I have to build in a provision to cover an over rev through a missed gearchange or similar, and it often involves a number of detail changes in order to arrive finally at a satisfactory outcome.</p><p>Cyborg</p><p>a great little Spintron movie, but the end comments re valve seating bounce where poor springs are blamed, is not strictly correct. Bounce can be the result of a badly designed closing side of the cam, and with a better design the springs would be OK. No matter, the spring oscillations are shown in the output graphics of my dynamic simulation, and when I get it wrong I see the bounce , just as the Spintron shows it.</p></blockquote><p></p>
[QUOTE="Deleted member 3831, post: 105248"] TT sorry I didn't reply to your query re the difference between cam profile data and how it can be related to lift at the valve. I must stress the graphics are cam lift data only. I would not start to work from the cam, but would start from the valve lift design that all my calculations and simulations (both static and dynamic) indicate would be capable of meeting the design performance target. This valve lift design is then processed through the valve train of the engine in question to arrive at the cam, where a profile will be calculated. It is of course necessary to have complete data for the valve train, dimensionally and with X and Y co ordinates where appropriate, together with all weights and inertia and stiffness values for the moving components, which will also include full valve spring data , and this can take some considerable time to collect if the data is to be accurate. which it must be. With some engines I have to build in a provision to cover an over rev through a missed gearchange or similar, and it often involves a number of detail changes in order to arrive finally at a satisfactory outcome. Cyborg a great little Spintron movie, but the end comments re valve seating bounce where poor springs are blamed, is not strictly correct. Bounce can be the result of a badly designed closing side of the cam, and with a better design the springs would be OK. No matter, the spring oscillations are shown in the output graphics of my dynamic simulation, and when I get it wrong I see the bounce , just as the Spintron shows it. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Camshaft
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