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G'day mates. What (if any) likelihood is there that a bad PCV would cause Low Oil Pressure in an normally aspirated engine? (Generally speaking, not specific to any particular engine) What are your thoughts / experiences? Found this explanation at LS1Tech.com Can PCV malfunction cause low...

The original bearings only had a hole in the one half of each bearing set per rod.

I follow you here. The newly installed MAHLE bearings had the hole on BOTH halves. All 6 sets of two bearings had a hole in each half. You could not install them such that the oil hole did not line up. As long as you put the tangs on both bearings on the same side (and there is only one way...

Even though the Oil Pressure meets or slightly exceeds the Factory oil pressure specifications, it is on the lower end so I would like to bring the oil pressure up a bit. I'm considering replacing the oil pump and the oil pressure relief valve and spring. From the precise measurements I took...

totally smooth. MAHLE brand

Pablo, Your shop is a sign of a hard working man who gets stuff DONE ! I tackled this same problem with TONS of wire rack shelving and bin boxes. I wrote CF programming to keep track of it all. Over 1000 items in the database as we speak and growing. I'm too scatterbrained to be organized...

C'mon now.... everyone knows the problem with doing that. Haven't used it 5 years but THE MOMENT YOU GET RID OF IT ......

At least not for a long time. Took another 100 mile trip today and so far all seems good.

I wonder if that wear on the pictured bearings specifically is qualified as "Abnormal wear" being that the engine does have 160,000 miles on it?

As I understand it, it makes no difference the cylinder that malfunctions, it's the resonances and vibrations that are set up and travel across the crankshaft. The misfire could be on Cyl No1 and the majority of the damage could be at the opposite end of the crankshaft. The cylinder that had...

I had a thought regarding the pitting. Could it be the pitting was caused by stresses and vibrations that were induced along the crankshaft during that time the vehicle was driven with one cylinder (the one I replaced the piston in due to no compression)? I do not know how long the previous...

I learned that crankshafts must be ground in the direction of rotation...then polished in the opposite direction of rotation. Never knew that. Is that what you mean when you refer to Metallurgy?

Ok. Thanks. For a minute I thought Dodge had gone cheap on engines. That said, it is precisely where the erosion occurred so there's that.

If I knew that my motors all came with non-chamfered rod bearings I would change them for chamfered bearings just to preclude this. Why on Earth would a car manufacturer use non-chamfered bearings? Isn't it pretty obvious a straight drilled oil hole in a rod bearing is prone to fatigue failure...

I think the biggest take away from this thread is the bearings themselves. I found that the bearings in the OP photo were non-chamfered around the oil hole and all the pitting occurred there. The replacement bearings are all chamfered. (sp?) My best WAG is that these chamfered replacement...

The great thing about forums is that no matter what answer you feel is the "best" one, right or wrong, just wait and you'll get the one that you endorse sooner or later ;)

Like anything new...if it sounds too good to be true.....it usually is. Even if I wanted them, I would wait a few more years to see if the magic remains or is debunked.

Yes. Excellent info. I'll be holding onto these links going forward. Thanks!

🏁

After reviewing these documents and the images, the damage on my bearings most closely resembles surface fatigue....localized only around the non-chamfered, drilled oil passage holes. (So only a minor case and probably not indicative of pending engine failure) This motor more than likely did...