Best Article I have seen on ZDDP and camshafts

[Lynn]

In Hemmings this morning.

https://www.hemmings.com/stories/bre...ign=2024-01-29

[dustinm]

What funny is in my engine classes 30 years ago, those ingredients were described as anodes for cathodic protection against acids formed from the combustion process.

I have tried to attach a blackstone oil test I have saved from 2012, showing racing oil with reduced Z package due to the shortened change intervals (without luck).


Cam failures due to material usages for the manufacturing of the components themselves are nothing new, remember the 305s of the late 70s? And our own recent cam discussion highlighting issues:

""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 ""

[Lynn]

Agree, the cam failures can be either or both issues; lack of ZDDP and poor manufacturing process.

[67Ss4spd]

I read that. Great informative article.
I’ll refrain on the material comments,
My new HFT runs fine and is wearing fine.