In the case of the failed cam photo that I posted above, the stellite welding and grinding was done by a very experienced camshaft grinding firm. The followers were also refaced and reground to a different radius and offset than was original, but by a different firm. The followers were however refaced with Castolin Eutecbor 9000 hard facing brazing alloy containing stellite, tungsten etc. Quoted RC55 – 62 which is similar to the stellite weld and recommended by the manufacturer for the purpose. There was no sign of wear on the followers, just a polish. The followers generally wear much more quickly than the cam.
The Eutecbor hardface brazing is however more difficult to grind than stellite.
The valve is 1.75” and valve spring seat pressure of 130lbs.
The cam is set to run in a bath so that the lobe dips into oil every rotation. The oil bath does however drain when the engine is stopped and would take some running to fill after each start.
I would love to know the cause.
ando