On the off-topic of flat tappet cams going flat:
Fred Kanter Quote:
We sell 1000's of new and rebuilt cams a year and in the past 10 or so years experienced warranty claims saying a few lobes were soft as they were destroyed.
Using the cam manufacturer's break-in lube does
NOT solve this problem. As I understand the situation, the problem is the lack of zinc in today's oils. Zinc was removed because it was contaminating the catalytic converters. For a while, one could use Shell Rotella (for diesels which contained zinc) oil for break in. However, once catalytic converters started being fitted to diesels, Rotella was reformulated to remove the zinc, so now that doesn't work.
Now guys are using ZDPplus additive, not only during break in but continually. The flat tappet failure problems have been virtually eliminated for cars with no cat converter.
One of the major reasons for OEMs going to hydraulic roller tappet cams was this situation.
Craig
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