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09-01-2019, 08:05 AM | #1167 | |
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Completely agree that it could be helpful to see how those other engines wear their rod bearings. But we'd also have to know a ton more about those engines for any comparison to be meaningful. That's the point. Like, just to pick one small example: I did the same super-rough rod bearing area approximation for the F20C, and the number I got (~3800 mm^2) is much bigger than what I got for the S65. The GT3 seems to land in the same ballpark, though slightly higher. That alone might explain why those engines are easier on their rod bearings -- if they even are in the first place, which I can't say (I've heard informed people comment both ways). Last edited by IamFODI; 09-01-2019 at 10:53 AM.. |
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09-01-2019, 06:24 PM | #1168 | |
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If any of the awesome engine builder that are part of this forum have examples of old bearings out of good Porsche, Ferrari, Honda or Audi engines, it would be great if they could share them here. Hell, a set of bearings out of a Cup car would be the shizz!! Happy motoring!!
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2011 E92 M3 - 6MT, ZCP, ZF LSD, ESS G1, Some other goodies... Last edited by Scharbag; 09-01-2019 at 06:31 PM.. |
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09-11-2019, 01:44 PM | #1169 |
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Here are my rod bearings that were just replaced. 2009 E90 M3 with 74k, fourth owner with very little service history. Personally I see nothing to be concerned about with the bearings that came out. I am glad that they're done and it's not something I will be worrying about any longer. Light wear and some very small places of copper showing. You be the judge
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09-11-2019, 03:30 PM | #1170 | |
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09-11-2019, 03:58 PM | #1171 |
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I changed my rod bearings about 2 years/40k miles ago with an aftermarket (forgot the brand, but I went for the more expensive one). When is the next recommended mileage to swap them out?
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09-11-2019, 07:31 PM | #1172 | |
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If you want to feed the public knowledge base on this topic, run yours to 60k-80k+ (recommended interval for stock bearings) and then pull 'em out so we can see. |
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09-12-2019, 10:48 AM | #1173 |
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2009 e90 M3, 59k miles. Castrol 10w60 till 54k. Redline 5w50 last 5k. Car has been autocrossed but not tracked. Not too bad I think.
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09-17-2019, 06:12 PM | #1174 |
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50k miles on a 6mt with a supercharger
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09-17-2019, 07:09 PM | #1176 | |
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And why are you focused on warm-up? Some who are religious about warmup and short OCIs have removed bearings that look totally thrashed. Clearance is the issue. Some people get lucky. Some do not. Yes, not thrashing a cold engine is wise but letting a tight engine warm up fully will not solve the clearance problem. Cheers,
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09-17-2019, 08:00 PM | #1177 |
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It is with a supercharger after all !
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09-18-2019, 06:07 AM | #1178 | |
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I would agree, though, that a few owners have abused their cars on cold starts and added to bearing wear that may or may not have otherwise occurred depending on the actual clearance in the particular motor. And likewise that some owners have used low octane or bad gas and suffered detonation that caused wear. And that some did not change their oil even within BMW’s 15,000 mile or 1 year spec and that might have caused added wear. Last edited by pbonsalb; 09-18-2019 at 06:13 AM.. |
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09-18-2019, 08:07 AM | #1179 | ||
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Correct me if I am wrong but BMW would have issued a recall on this if the number of motors blowing was much higher? That being said, the amount of cars with these particular rod bearing issues is too limited vs the production number of cars produced? Trying to better understand, not meant in a smart-a$$ way |
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09-18-2019, 08:35 AM | #1180 | |
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Being mindful of things like cold running, fuel quality, oil change intervals, etc. is clearly valuable -- not because it'll guarantee long engine life and the opposite will guarantee early failure, but because it's all just good practice and can improve the odds for any engine. |
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09-18-2019, 08:41 AM | #1181 | |
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I'd imagine excessive rod bearing wear isn't much of a risk in terms of legal liability, but it's certainly very high in terms of cost to fix. If that's correct, the bar for a recall is going to be fairly high vs., say, a loose battery cable that might cause a fire. To be clear, I share your implicit suspicion that the rod bearing issue would clear that bar easily if it were as bad as some people made it out to be. That's just a hunch, though. Last edited by IamFODI; 09-18-2019 at 08:48 AM.. |
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09-18-2019, 10:48 AM | #1182 |
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Mine at ~108k.
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09-18-2019, 11:26 AM | #1183 | |
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I replaced mine when my extended warranty ran out in 2014. I used stock bearings with wpc treatment. Increased clearance bearings were not yet available. I have 40k miles on the new ones and will change them sometime in the next 20k miles. I removed my originals at 60k miles and they weren’t disintegrating and about to fail but had excess wear. |
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09-18-2019, 05:32 PM | #1186 | |
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09-23-2019, 04:01 AM | #1187 | |
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09-23-2019, 09:20 AM | #1188 |
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You'd have to ask Bert. But yes, I think that's the whole point of his oil flow testing on BE Bearings is to test oil flow at various engine oil temperatures up to redline. That means when the engine is cold, it hits the cold-start limiter at various RPMs until the engine is fully warmed. This is what the oil flow graphs show IIRC.
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