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03-25-2014, 12:22 PM | #1 |
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You can upgrade rod bearings, increase your oil interval frequency (5000-7500miles), ensure proper warm up and keep RPMs below 3k until then. do oil analysis and monitor bearing wear with every oil change
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03-25-2014, 02:16 PM | #2 |
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Except that there is really no "upgrade". Sure some folks are tinkering and making some claims and gaining perhaps 1/10th of a thousandths in clearance...
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03-25-2014, 03:41 PM | #3 |
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If the engine is being rebuilt, ensure that the rod and main bearing clearances are properly set ...... That is the main thing that can be done to increase longevity.
The vast majority of failures are related to the rotating assembly e.g. Main and rod bearing failures. |
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03-25-2014, 05:42 PM | #4 | |
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What is "properly set", factory values? There is no "solution" less custom crank undersizing AFAIK. It's also still debatable if BMW bearing clearances have caused any lack of reliability so hence I refer to this a a "solution".
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03-25-2014, 09:32 PM | #5 | |
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http://www.m3post.com/forums/showthread.php?t=379712 |
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03-26-2014, 03:02 AM | #6 | |
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The factory has no published values so you know I am not referring to that. How do you still hang on to the fact that there is no problem when random people are still losing engines. What do you think caused this guy's hole in the block if it wasn't a thrown rod? I gave the OP my opinion, based on my background I think my opinion is worth something. Go grab a textbook and read some more about engine failures while I actually work on and repair real life engines with my own hands.
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03-26-2014, 12:22 PM | #7 | |
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However, as to your second point, nominal factory values are established and they are, for the new bearings (702/703), basically inside the narrowest "rule of thumb" range, whereas the older ones (088/089) are just outside of this "rule". If you are going to give the guy advise, you should probably say a lot more than have clearances "properly set". If you think all rebuilds should have custom ground rod journals, say that. I think your opinion is certainly worth something, but so is mine. We've debated this academics/textbook vs. hands-on thing before and I don't think you really want to go down that path again do you?
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03-26-2014, 12:26 PM | #8 | |
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03-26-2014, 12:29 PM | #9 | |
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cause you said it yourself. This is still a random issue with much more cars driving on the road than blowing up. I know a little bit about cars and have built many myself, and I will still stand to say this is magnified due to the forums presenting those only w/ problems. |
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03-26-2014, 03:09 PM | #10 | ||
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Anyhow, the OP asked for a way to increase reliability and since his engine has failed and he needs to source a replacement, it would be smart to add some clearance since he has the opportunity to do so! |
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03-26-2014, 03:16 PM | #11 | ||
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03-26-2014, 03:17 PM | #12 | |
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There was main bearing failure. It's a documented case. Maybe the pictures didn't match because I didn't look hard enough. But elmariachi did chime in to a thread recently and confirmed he suffered from main bearing failure. |
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03-26-2014, 04:55 PM | #13 |
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Not trying to "push you buttons" but you can say the above about ANY engine... The question is how much longer might it have ran and neither of us can answer that with any accuracy at all...
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03-26-2014, 05:14 PM | #14 | |
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I can only go by what you posted...
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03-26-2014, 05:56 PM | #15 |
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03-27-2014, 12:27 AM | #16 | |
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03-27-2014, 01:26 AM | #17 | |
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05-28-2014, 03:57 PM | #18 |
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If this was really an issue with the specs being too tight, wouldn't a lot more fail? Seems more consistent with the occasional failure to perhaps be out of spec and failing, otherwise how would vast majority be totally fine?
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05-28-2014, 04:05 PM | #19 |
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This is all discussed in the bearing wiki thread. For the most part, this is the same things I have said all along. The specs are tight, and when you add tolerance stack up (the occasional two parts being out of spec but mated together), then things go boom. But saying the vast majority are totally fine is probably incorrect. So far, all but one set of bearings ever taken out, photographed, and displayed on the forums didn't look totally fine. And that one set of bearings that did look pretty decent only had 16k miles on them.
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05-28-2014, 07:30 PM | #20 | |
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05-29-2014, 12:45 AM | #21 | |
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05-29-2014, 01:19 AM | #22 | |
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You don't need to use the word theory, your matter of fact style when presenting this speculation provides the implication for you. Reread your own post I replied to! Please tell me that it does not sound like it is a foregone and certain conclusion as to what the exact cause of all of the bearing related failures is. Once you disagree with this observation you can get back to accusing me a chest beating.
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