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06-18-2013, 12:06 PM | #309 | |
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06-18-2013, 01:16 PM | #310 |
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I will!
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06-18-2013, 03:10 PM | #311 | ||||||||
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Finally we got BMRLVR in here to talk some sense into people.
Everyone keeps talking about these new fangled "upgraded" and "reinforced" bearings. What the hell does that mean? They got a new coating? If the crank makes contact with the bearing (the failure mode), that won't matter much (maybe it will last a LITTLE longer with this fancy NEW coating). They changed the oil clearances (the root of the problem)? Doubt that. Bearings are a band aid as far as I see it. You are buying yourself time. You're not correcting the issue. Quote:
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At first it was 08 and 09 because there were more of them with more miles (crazy right) than the new cars that were just delivered. Now there are more later cars getting more miles and they are starting to show the same issue. See how that works? That said, this issue seems to be somewhat random and only significantly affects a small portion of cars. My '08 has 61k miles and consistently shows high bearing wear metals in the oil. No scary noises yet though.
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06-18-2013, 08:16 PM | #312 |
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"The bearings have not changed throughout the entire production run. The part number may have changed (new supplier?) but the oil clearances did not and that is the issue. Because of this, all E9X M3s are equally susceptible to the issue IMO."
Please explain what you mean by oil clearances. If you mean the clearance between the rod bearing and the crank journal, I would have thought that this specification would have been worked out decades ago. |
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06-19-2013, 01:04 AM | #313 |
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AFAIK the rod bearings and part numbers haven't changed for the entire production run. And yes he's talking about the main journal to bearing clearance, and rod journal to bearing clearance. There's apparently a disagreement about whether or not the factory clearance offers enough safety margin or not.
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06-19-2013, 05:46 AM | #315 |
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thats the nature of any mechanical device. if you reinforce that weak point, something else will become the weakest point.
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06-19-2013, 09:10 AM | #316 | |
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06-19-2013, 09:38 AM | #317 |
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Hmm... this thread is very interesting. I have been pondering the idea of getting my rod bearings replaced due to this thread since my mileage is getting up there (and being boosted). I am at 70k miles now. Do you guys think it is necessary now or maybe even at 100k, 150k+ to get these bearings replaced? BMRLVR raises some very valid points about the bearings and the clearance of the oil. I have also not seen/heard of any higher mileage cars having rod bearing issues. Do any of you boosted guys plan on getting your rod bearings replaced in the future or at some mileage point?
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06-19-2013, 09:42 AM | #318 | |
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Personally, I wouldn't change the rod bearings unless my oil analysis comes back bad, or if I go boosted. Also agree with M3PO. What does an "upgraded rod bearing" even mean?
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06-19-2013, 09:47 AM | #319 | |
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06-19-2013, 09:57 AM | #320 | |
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Basically BMW likes to build their engines tight....... Tight tolerances are very commonplace when Germans are building stuff........ The problem is that it leaves you no room for error. Dinan for example builds their strokers with 0.019" main clearance and 0.025" rod clearance! |
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06-19-2013, 11:43 AM | #321 | |
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06-19-2013, 11:57 AM | #323 |
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06-19-2013, 02:36 PM | #325 | |
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I bet he would tell you that it's anyone's guess when they will eventually fail. But I bet he would also say that if they haven't failed at this point, it's likely that they will fine for quite a while 9again, anyone's guess as to how long). Saying something like "boosted cars should have the bearings changed at 100K miles" is just speculation.
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06-19-2013, 03:35 PM | #326 | |
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I was going to have my bearings replaced before I had the supercharger installed. After messaging BMWLVR I decided against it.
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06-19-2013, 08:42 PM | #327 | |
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06-19-2013, 09:21 PM | #328 | |
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06-19-2013, 11:46 PM | #329 | |
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If these engines spun to 7k they would probably be fine with 0.001" of clearance, but spinning 8.4k the hydrodynamic wedge of oil is not thick enough to prevent metal on metal contact in some instances. This boundary lubrication condition takes its toll on bearings over a period of time! |
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06-20-2013, 09:10 AM | #330 |
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