I want to bring that up again because I have some news about.
I've installed a new cam and tappets last year and now some of the tappets
don't look good and one is damaged.
I had a talk with a famous German cam manufacturer (Schrick) and they say that
tappets should be very slightly domed to handle geometrical imperfections. You
can run flat but it is better to have a dome less than 0.002mm (0.000079").
If the cam has a taper grind then you can have a dome of 0.004mm (0.000157")
The tappets on the market seems to have 0.007mm (0.00275") dome which could be
too much and a cause to cam failures. Depends on the cam if there is a taper
grind on.
So I think the better idea is to grind them flat and give them a slight dome
by hand on a lathe with fine sandpaper....
Cheers
Chris
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