Quote:
Originally Posted by RobR
Nick’s post:
The issue IMO is more to do with insufficient case hardened depth on the cam cores being used. The issue is when the case depth on the nose isn't enough and this is magnified because of spring psi being highest at over the nose of the cam, than on the base circle of the cam .
Certain companies use the same UGL( unground lobe ) cam cores for a multitude of cam valve events, pt numbers , etc . The issue lies in that you harden the lobes during heat treat, but when you try to cut the more than one cam profile, using multiple centerlines or lobe lift( base circle) on the same core ,you end up grinding away too much or even going through the heat treat in some spots.
If the use a specialty UGL for each specific cam then the case depth is set at XX mm of what it needs and you after final grinding you are left with sufficient heat treat depth.
We see it all the time here .
Thanks
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Best post I've seen on this subject. On the subject of sound, I even wanted forged pistons in the 350 Chevy motor I put in my CJ5 because of the noise. Solid lifters, a cam lope, intake whoop, an M22 whine, the list goes on. Without it, you could be driving anything, and I'd rather stay home.