Thanks for these pictures. Roller cam followers are quite common today but most of them are used on ohc designs, often for smaller four valve gear. In case of the Vincent engine they would operate not only the big valve but one pushrod and another rocker so dimensions matter here a lot. In my eyes the roller above looks not overly big so one will see if it is a durable proposition. There were numerous - plain bearing - roller followers for pushrods even prewar like Horex when I did a crowded needle roller mod like in the 1935 Guzzi we run like that since the eighties, no problems. The pinions are casehardened for the needles of course and punchlocked with carbide punch in the followers.
Maybe a curved contact pad on the near standard Vincent follower , no roller, would be tougher instead, lighter too. That would be very similar to the postwar Horex Regina with almost roller looking followers and certainly cam lobe shapes to go with the curved followers.
Vic
Maybe a curved contact pad on the near standard Vincent follower , no roller, would be tougher instead, lighter too. That would be very similar to the postwar Horex Regina with almost roller looking followers and certainly cam lobe shapes to go with the curved followers.
Vic