Quote:
Aim is 1st June this year.
Quote:
lamb_daiquiri wrote:
Will you be regrinding old cams or producing brand new ones? It's better to avoid reducing the base circle too much as it increases the loads on the cam surface/ shortens cam/ lifter life.
Sounds like you've got all the gear to make new cams from some nice 4140 round stock, nitride them after finishing and they'll last a very long time. I was very impressed with the wear life of the nitrided 4140 gear I had made for a prototype at work. No good for my application though because it needs lubrication otherwise it'll destroy the mating part! (In this case a ss304 gear with 14x the number of teeth).
I will be doing both, although steel cams will cost a lot due to gear machining so I don't think they will be very popular - Not too many people want to spend $1000 on a cam for an A series when you can regrind for $200 and get the same result. I'll likely have two options, case hardened 8620 and through hardened EN30b tool steel. The problem with changing cam material is steel doesn't hold oil like chilled iron (factory cam) so you have to be careful with lifter material and compatibility with the cam.
Reducing the base circle does not increase the load on the cam. The nose radius does reduce for the same profile at a smaller base circle diameter (which increases nose stress) but this is easily countered by designing the cam profile's negative acceleration curve over the nose. I have never heard of cam wear issues on correctly reground & run-in A series cams.
Transfer
