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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Camshaft design
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<blockquote data-quote="oexing" data-source="post: 90870" data-attributes="member: 1493"><p>One can discuss this topic for ages, but fact is you cannot run a flat follower, be it a lever or flat cup (bucket?)tappets on a cam for roller followers. The duration would be extremely long but mainly you get almost a hammering mode from the nearly flat sides joining the base with the top circle. A flat type absolutely needs curved cam shapes all around the lobe for smooth operation. You may run a roller follower on a cam for flat followers but the performance would be less than poor. </p><p> Whenever a lever type follower is specified you will see a more or less asymmetric cam shape. With a curved lever follower this is not so obvious but in case of the flat Vincent type this is very pronounced. So for develloping a new cam you´d start with the valve motion file with lift, duration and acceleration from computer generated files that guarantee smooth operation without jerk. </p><p> Then you have to model the rocker design with its own changing ratio as the valve approaches full lift. </p><p>With that you go down to the flat follower and see what shape the motion from above via the flat follower produces as a cam shape.</p><p> I am no CAD freak and have no idea what software could help here. I´d have to cut cardboard templates ten times bigger than real and do hours on my drawing board with degree disc and good pencils , did that for a 460 Horex years ago as a trial.</p><p> Only later you can plot the valve lifting diagrams from an assembled engine and dials on the valves and paste your findings on paper charts to verify your efforts.</p><p></p><p> Vic</p></blockquote><p></p>
[QUOTE="oexing, post: 90870, member: 1493"] One can discuss this topic for ages, but fact is you cannot run a flat follower, be it a lever or flat cup (bucket?)tappets on a cam for roller followers. The duration would be extremely long but mainly you get almost a hammering mode from the nearly flat sides joining the base with the top circle. A flat type absolutely needs curved cam shapes all around the lobe for smooth operation. You may run a roller follower on a cam for flat followers but the performance would be less than poor. Whenever a lever type follower is specified you will see a more or less asymmetric cam shape. With a curved lever follower this is not so obvious but in case of the flat Vincent type this is very pronounced. So for develloping a new cam you´d start with the valve motion file with lift, duration and acceleration from computer generated files that guarantee smooth operation without jerk. Then you have to model the rocker design with its own changing ratio as the valve approaches full lift. With that you go down to the flat follower and see what shape the motion from above via the flat follower produces as a cam shape. I am no CAD freak and have no idea what software could help here. I´d have to cut cardboard templates ten times bigger than real and do hours on my drawing board with degree disc and good pencils , did that for a 460 Horex years ago as a trial. Only later you can plot the valve lifting diagrams from an assembled engine and dials on the valves and paste your findings on paper charts to verify your efforts. Vic [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Camshaft design
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