quick change cam

Here is what I do for a quick change cam.
First I machine the cam hole to 37mm for a NA 4904 bearing. I bore the hole deep enough that the rear surface of the bearing is in the same position as the original thrust surface was. I drill and tap a couple holes for a curved tab that goes into the hole and holds the bearing in place.



Then I grind the journal of the cam down to 20mm and fit an inner race for the bearing. I don't have the number for the inner race handy but it is a common part.



The inner race is wider than the bearing so I machine a bronze spacer to take up the play between the outside edge of the bearing and the backside of the cam sprocket. It is a sliding fit over the inner race. The bronze thrust spacer is not in the picture. Jim

Jim
They don't wear that bad! Full marks though for ingenuity, I'll probably wish I had paid attention the next time I change a cam! :lol: :lol:

Cam wear is not my concern. I just have a couple different cams I want to play with. If you look at the last post here you will see why. Jim

crankshaft-grinding-t8410-30.html

I'm impressed as usual by Jim's creative machining. I'm put off on cam door this way because each cam would have to be altered. Peel is getting old school cam door, a disc to hold bush and 3 bolts to hold it to case. Will be fun to hear how same engine set up responses to different profiles.