You will get a kick out of this one!

[ProStreetCamaro]

Here check this out. According to these guys Amsoil has NO zinc or anti wear additives at all and thats why this ROLLER cam went bad!


http://www.stevesnovasite.com/forums/showthread.php?p=935399&posted=1#post935399

 

[ryan2022]

LOL,

Well, I dont use amsoil, but I would in a heartbeat if I ran longer drain intervals.

No antiwear additives? I guess that makes the excellent UOA a complete mystery then.

 

[Drew99GT]

I'll betcha a case of Amsoil that Big Al thinks Pennzoil causes sludge!

 

[Pablo]

Classic - blame the oil!

Actually, I'll bet the metallurgy is the problem.

 

[Drew99GT]

Either that or whoever adjusted the valves didn't have a friggin clue what they were doing, but if they were so tight as to gouge the cam, the engine would have run like crud and shot fire out the intake.

 

[Cup of Joe]

The lobes look pretty aggressive, allot of ramp and there is wear on the back side of each lobe which shouldn't have any at this mileage. A roller lifter should just glide across the base circle of the cam unless the adjustment is wrong and the springs are pressing the lifters down even on the base circle section which should be unloaded.

 

[ProStreetCamaro]

Originally Posted By: TaterandNoodles
The lobes look pretty aggressive, allot of ramp and there is wear on the back side of each lobe which shouldn't have any at this mileage. A roller lifter should just glide across the base circle of the cam unless the adjustment is wrong and the springs are pressing the lifters down even on the base circle section which should be unloaded.

I am pretty sure it is a very aggressive cam. I have a feeling they were adjusted to tight but with out looking the engine over in person its really a tough call.

 

[Cup of Joe]

Originally Posted By: ProStreetCamaro

with out looking the engine over in person its really a tough call.


Exactly and no shots of the lifters. He only mentions 5 but 11 could be worn internally or simply reused stockers that are not intended for this kind of ramp speed and cannot support the angles.

 

[OVERKILL]

Normally with roller-stuff, if you over-tighten the rockers, you just end up hanging valves and have an engine that doesn't work worth a [censored] and runs like [censored]. On SFT/HFT you can easily destroy stuff.......

 

[Dick in Falls Church]

Sounds like another case of the oil being smart enough to pick out just a few things. Reminds me of years ago when I got complaints about AMSOIL wearing out GM cams. My first question was "Was it the third exhaust cam?" Answer was almost always "Yes".
Took a while for GM to admit to manufacturing problems, and cost me a few customers.

 

[Steve S]

I lost a 3.8 olds engine when using Amsoil the cause of the failure was the roller cam did not have a bushing installed in the timing chain cover from the factory to stop the cam walk .

IT was not the oils fault in any way.