Have you had experiences with the aluminum camshaft bearings vs the tri-layered babbit bearings?
Colin
Have you had experiences with the aluminum camshaft bearings vs the tri-layered babbit bearings?
Flies in the face? Really? My comment that lifter and cam metallurgy has been a problem "flies in the face of real scientific testing"?Bleyseng wrote: ↑Fri Sep 22, 2017 8:27 pm"What we have here with the zinc-fortified oil brigade is the same misattributions that lead people to synthetic oils as a "cure" for hot oil temps that should not be so hot in the first place. We have had some real problems with metallurgy in the lifters and camshaft lobes, that is the issue, not the composition of the oil."
This comment flies in the face of real scientific testing vs seat of the pants gosh O'golly it works for me.
The units I saw tearing down 2.0 chasing cores, all had Kolbenschmidt camshaft bearings, all flake like partial jig saw puzzles
In 2000-2001 there was a bad batch of camshaft blanks, so yes there was a time where that was a real problem. This was sorted out by JR who did his famous "spintron" testing of numerous cams and lifters. JR also did his RoadAmerica real world testing of a bunch of oils along with L&N with oil analysis for determining the wear of cams/lifters. The old V8 world has also done their share of testing as their cams/lifter experience abnormal wear without ZDDP. Modern engines have roller lifters or overhead cams so the need for ZDDP isn't there but all flat lifter engine benefit with ZDDP as that's why it was in all oils before 2001.Amskeptic wrote: ↑Sat Sep 23, 2017 12:28 pmFlies in the face? Really? My comment that lifter and cam metallurgy has been a problem "flies in the face of real scientific testing"?Bleyseng wrote: ↑Fri Sep 22, 2017 8:27 pm"What we have here with the zinc-fortified oil brigade is the same misattributions that lead people to synthetic oils as a "cure" for hot oil temps that should not be so hot in the first place. We have had some real problems with metallurgy in the lifters and camshaft lobes, that is the issue, not the composition of the oil."
This comment flies in the face of real scientific testing vs seat of the pants gosh O'golly it works for me.
I'd like to research this further.
Do you have links that show zinc-fortified oil users have had no problems with cam/lifter failure?
You would like to paint my comment as pants gosh O'golly it works for me, but you miss an important point.
I have not made any recommendation to prevent cam/lifter failure.
You have.
You recommended zinc-fortified oil because the seat of your pants gosh O'golly sez it works to prevent lifter failure.
Robbie, a person with experience and growing knowledge, offered that he did suffer lifter failure with zinc-fortified oil.
I offered that I have not suffered lifter failure and I have never run zinc-fortified oil.
So, reconsider the science, the control variables, the data, and allow me to reiterate that I think the problem with lifters and cams have been metallurgical or installation error perhaps, not the composition of the oil.
Colin