Cams/Cam Journals... (How did this happen?)
- Thread starter Fubar231
- Start date
Still has to get by the oil filter to cause that sort of damage doesn't it?jetjock;1534967 said:
It does but that's easy for most oil filters, especially if they're changed too often which is what most people do. The tip off would be compressor blade leading edge erosion like the kind typically seen with K & N air filters.
^ Well worth checking Fubar.jetjock;1534978 said:
Still trying to get my head around how ingested dirt finds it's way to the Cam saddles though?
The oil filter could have gone into bypass but studies have shown full flow filters don't do much of anything anyway. It's what makes the huge marketing behind them so amusing. A good air filter is far more important to the engine's health. That's my story and I'm sticking to it 
LMAO I can see upper cylinder wear being an issue with bad air filters and I guess in time you could end up with enough wear that some crap would get by the rings into the crankcase then into the oiling system, I'd hope even the worst filter would catch the majority of this garbage.
Another scenario that comes to mind is a dirty assembly but I don't know this engines history.
(Filters take a LOT of crap before they'll bypass and being a 7M I'd sort of expect RK long before now)
Another scenario that comes to mind is a dirty assembly but I don't know this engines history.
(Filters take a LOT of crap before they'll bypass and being a 7M I'd sort of expect RK long before now)
Yeah, I think the typical bypass setting on most filters for this engine is around 16 psid. And you're right, the cause behind his problem is all speculation without knowing more. Iirc the saddle material is pretty soft although I don't recall if it's babbitted. Been too long
Babbit is on the Journals, saddles are plain Al, another possible contributing factor will be an annealed head on the Ex side, be interesting to see the intake side for comparison.
True. Didn't think of that. What I get for having too many beers. For some reason they won't let me drink at work so I have to make up for it on my days off
Me too. Takes more than a few beers to make me happy
Now you have me wondering how much dirt can enter through the PCV system...
Now you have me wondering how much dirt can enter through the PCV system...
jetjock;1535015 said:Me too. Takes more than a few beers to make me happy
Now you have me wondering how much dirt can enter through the PCV system...
I'd guess quite a bit looking at some pics I've seen of the 4mm orifice (well up until it blocks solid that is)
With it running past the valve covers on the way to the TB. One would think the direction of flow would prevent entry into the covers though.
Good point these cars usually have + pressure in the crankcase at anything above idle
(blowby from being wornout)
(blowby from being wornout)
Mine was actually very low (measured by manometer) but it was in good health. In that case blade erosion might be less. Or so I reason. I dunno. Ah well...it's not my engine
I was also thinking.. this is probably not the case, but if someone with a BHG kept running their car, wouldn't the oil lose its lubricating ability.. and you might have metal to metal contact?
Have to wait for some more detail from Fubar, mine are usually pretty good for 30>40k KM's then start to breath a little heavy but I put that down to the thin rings supplied for most forged pistons.jetjock;1535028 said:Mine was actually very low (measured by manometer) but it was in good health. In that case blade erosion might be less. Or so I reason. I dunno. Ah well...it's not my engine
Could be a factor that the gouges suggets it's had debris run through the cam saddles (it get's trapped in the soft babbit material on the cam journals and just gouges away till there's enough wear to escape)92TealSupra;1535033 said:
Have to wonder at the Mains and Rod bearings at this stage.