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05-26-2018, 06:04 AM | #705 |
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I don't know what you're talking about with a wave pattern... None of the bearings I see show any signs of failure due to excessive vibrations.
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05-26-2018, 06:08 AM | #706 |
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Ok, I'm confused
Helmsman, what do you mean by "high level" shells? ///M-Power Belgium, "wave pattern"? deansbimmer, what do you think about the wear shown by InTgr8r, aswy6, wickz80 or myself? Is it significant or not? |
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05-26-2018, 06:53 AM | #707 | |
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Many of these recent bearing swaps show OEM bearings still doing fine which doesn't surprise me. Some of these late model pulls above still look fine. Let's hope that long term the BE bearings work well and the mains enjoy more flow through them. In Rich's case, I'm thinking here's a car with its original owner who has always warmed it up carefully, etc, and that's how a 2008 arrives at over 100k miles with still very serviceable bearings.
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05-26-2018, 07:49 AM | #708 |
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05-26-2018, 11:28 AM | #709 | |
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Last year I talked with a race engine builder . And I showed him this thread and the blown S65 engine thread . So he saw the S65 bearings and the different wear paterns on the S65 bearings . I said to him that I noticed sometimes , some strange horizontal lines over the inside width of the bearing shells and always in the middle of the shells ! He said to me....You are correct . I see the *wave wear patern* sometimes on the bearings from supercharged engines . The wave wear patern is caused by internal vibrations and by overload of torque on Turbo and supercharged engines . And sometimes we can feel with our fingertip the irregularities (bumps) on the bearing surface. When we rub with a fingertip over this bumps , they actually feel like a wave through the fingertip . That's why we talk here about the *wave wear patern* He said also..That the cylinder walls of the S65 and S85 engine are too thin . BMW was rushed by the research of engine weight saving. That's why they are easily susceptible for internal engine vibrations . Check the horizontal lines in my red square in the picture below. But actually in all eight of the shells you can see this kind of premature wear . Note : This S65 has only 19K miles on it !
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05-26-2018, 01:34 PM | #710 | |
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At first I wondered if it was just lighting playing tricks. (I have several rows of exposed fluorescent tube lights in the shop) I just checked the bearing shells and there are in fact waves as you describe.
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05-26-2018, 02:00 PM | #711 | |
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Thank you for the confirmation
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05-26-2018, 04:07 PM | #712 |
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Hogwash. If it were a realistic issue, it would be a major topic of concern between actual engineers who focus on the S65...And we'd see a LOT more broken crankshafts and other symptoms actually attributed to vibration. Per a discussion with a bearing vendor I had at SEMA, small visible striations in the babbit layer of the shell are the result of the manufacturing process and lacking mid-process QC which causes inconsistent thickness of the binding layer. They only show as the babbit is worn away and the high/low spots in the binding layer become visible- a non issue for babbit layers that wear normally (i.e. not at all).
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05-27-2018, 08:52 PM | #713 | |
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05-27-2018, 10:22 PM | #714 |
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Clearly they didn't or they wouldn't have designed in such piss poor bearing clearances...
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06-09-2018, 07:20 AM | #715 |
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Not too bad.
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06-09-2018, 09:05 AM | #717 |
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2010 and 73,xxx are at the bottom of the pic.
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06-09-2018, 10:10 PM | #718 |
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For S65, sure. For normal bearings, they are not good.
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06-11-2018, 09:46 PM | #719 | |
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06-15-2018, 01:40 PM | #720 |
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EU guy here, 3rd owner, just bought it and did the service to be able to sleep at night, 2012 with 168000 km (104k miles). Oil changed at roughly each 20000 km (12k miles).
Ignore the scratches, they were all sitting together in a plastic bag while I drove home. |
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06-15-2018, 02:02 PM | #721 |
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Agreed.
None posted on this page should be considered "normal" wear. While not excessive, it's still not good.
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06-17-2018, 07:27 PM | #723 |
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2011 E90 M3 with 99,010 miles.
Purchased the car with 78,xxx miles as the third owner. Left are bottom, right are top. Replaced with VAC bearings if anyone is curious.
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06-17-2018, 07:44 PM | #724 | |
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Interesting to see your 12K miles oil change intervals , while your bearings look pretty decent ! I'm pretty sure . A bearing replacement was not necessary in your situation.
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06-17-2018, 08:19 PM | #725 | |
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Only a few posts on people who have replaced bearings more than once on the same motor. The few that I can recall said replacements looked very good. However they didn't compare the multiple sets. |
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06-22-2018, 11:32 AM | #726 |
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2008 e90 M3 seller had oil tested in Sept/Oct 2017 at 54,050 miles lab said "great report" i bought the car in May 2018 with 57514 miles replaced rod bearings at 58,692 miles this week with BE bearings and ARP bolts and this is the condition the rod bearings were in (they're not in any particular order) i wanted to do it as insurance and for peace for mind now i'm really glad that i did it
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