Quote:
Originally Posted by Doc Oc
Here is what bothers me. You and Ashley S. BMW are on every bearing thread saying "looks good to me". However, my bearings were worn past the copper on the parting lines and literally had chunks worn away on the sides on four of them. When you guys say " those look fine" when they actually look terrible, you lose credibility.
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The aftermarket guys are showing people clean looking bearings with oil on them claiming to have X or Y "supercharged" miles on them. This is where folks have gotten the absurd idea that no matter matter what miles a vehicle has, the bearings must look clean. As long as the oem bearings made it past 30K miles without being chewed up severely, then the varying surface appearances are just normal wear, mirroring oil change intervals of the owner, or owners.
Quote:
Originally Posted by Doc Oc
Question for you. Have you ever examined a bearing from this car yourself? Reason I ask that is because if you turn one on its side, you can get a good sense of the layers, at least on mine where the edges are ground down. The babbitt layers are very thin as compared to the steel backer which I would say makes up at least 85% of the bearing's thickness. How thin do you think they can get before failure?
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Have I ever examined a bearing from the S65? NO. Did you take pics of yours from the side, and compare it to the aftermarket guys bearings from the side, after 30K supercharged miles? Did you measure the thickness of your bearings, and compare them to brand new bearings? Did you, or any of the guys on here pulling bearings, or the aftermarket guys take pictures of the underside of the bearings? I'm too old to fall for the gimmic of: "hey look at these surface pictures!". Now go spend money to change yours so that they are shiny like this. I don't live in fear and it's absurd to think that my naturally aspirated car will fail suddenly without any type of warning whatsoever. It's also laughable that some trolls think that nothing is wrong with the main bearings. When those fail, it seems the engines seize. So a quick search on the forum reveals much more than 2 cases where that happened. Reading those threads, the owners foolishly changed their oil: "whenever the car told me to, at the dealership". Meaning, every 15K miles. So my final question for you is, rod bearings aside, what makes you think your main bearings are magically ok, and that now you are immune from failure because you put in coated rod bearings?