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N55 rod knock/spun bearing tracking
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03-11-2019, 03:22 PM | #177 | |
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Its easy to ignore all that.. its convenient. I get it but i personally decided not to ignore and i do think there is more to the story. |
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03-11-2019, 03:26 PM | #178 | |
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It's like Ghassan, they post a pic of a broken N55 crank with no details as to how it broke, and 90% of the N5X idiots are parroting on and on about how N55's break cranks. Click bait works. But you can choose not to ignore and dream up whatever stats you want, that doesn't mean there is a problem with the engine. My guess is that it is more of a problem between the drivers seat and the steering wheel.
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03-11-2019, 03:53 PM | #179 | |
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03-11-2019, 03:56 PM | #180 | |
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And the reason the SIB priming came out is to make sure the tech did it and to not blame it on the dealer but the engine instead because when they prime the engine it will throw a code eventually, and that code is then use to determine if the engine failure is because of tech or just the engine went RIP for unknown reasons which we are still un sure. |
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03-11-2019, 04:06 PM | #181 |
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Sorry 9k, but these engines ARE blowing up left and right. Many of the names of guys that had been actively posting since I joined have all of a sudden stopped posting. And now there is a new crew, 4 of which regularly post on this very thread, each hoping that if they see enough bearing snapshots with minimal wear it will somehow minimize the odds of it happening to them. No offense intended there. It all was documented on the spreadsheet someone started a few months ago. Many now probably don't bother to add to the sheet due to frustration over the whole thing. I've got to know, what personal thing happened between you and MMP? You seem to have a hard on for them. I really don't give a shit if you want to now trash me at every chance. Have at it. In a week or so I'll have a buffer on this problem. If you continue to debate the cause and ignore patching it your engine will more than likely give it up, and it will neither be MMP's or Ozzie335i's fault. BTW, i am going with their bearings. Yes, someone else probably makes them. From what I have read I am going to increase the clearence by .0005. We've all got choices, we can either keep looking at photos and praying, or take action. For now I'd prefer not to fly on a 737 max, but that is me.
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03-11-2019, 05:23 PM | #182 | |
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I would take anything someone says on Reddit with an extremely tiny grain of salt. Last edited by Welcome to NBA Jam; 03-11-2019 at 05:30 PM.. |
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03-11-2019, 05:38 PM | #183 |
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03-11-2019, 06:23 PM | #184 |
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03-11-2019, 08:25 PM | #185 |
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Video of the noise. You can hear two noises one louder than the other. One being a loud almost pop. Its happening more than just one time now but seems to be in the same spots during each rotation.
Any have any thoughts? |
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03-12-2019, 06:23 AM | #186 |
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I'm starting to be more of a believer in the design flaw theory now after watching BMW tech take apart a S55 and compare it with the N55. The common issues and reasons they have issues, different issues than each other.
S55 crank hub issues in conjunction with water pump (mechanical on S55) and oil suppy/sump pick up location and reason for oil starvation on N55 as apposed to S55. Please watch and read the closed captions, don't just watch cause it has 2 german guys taking apart an awesome M3 engine.
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03-12-2019, 06:24 AM | #187 |
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At 6 minutes into the video they look at oil pickup locations.
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03-12-2019, 07:36 AM | #188 | |
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Yes, the oil pickup is terrible on the N5x... and all BMWs going forward. It's a street car not a race car. Very few , if any, cars come with deep sumps, baffles, dual pickups, or dry sumps. It's not just BMW. You usually have to buy the highest trim engines to get a track ready oiling system (even on the LS engines). A basic n5x is not a race engine. That is why the S engines exist lol. It should be common sense that a street car doesn't need a dry sump... Their comments on N5x oiling issues was in the context of "motorsports." It happened to my N55. Pickup ran dry in a corner and the entire bottom end rotating assembly got cooked. We could definitely use a deeper oil pan, and S55 oiling system retrofit, a baffle, or some other solution for road-course work, but, I don't think that has much to do with any purported widespread N55 bearing issues on street cars. |
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03-12-2019, 08:01 AM | #189 | |
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The lesson I found here was keep a close eye on the oil level, frequent oil changes and don't drive it hard for very long. I don't believe this happens just once, but over a long period of time, running them hot, running them low on oil, then at the same time driving them like a sports sedan that they are while they're hot and low on oil. I guess that would be common sense.
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03-12-2019, 08:53 AM | #190 | ||
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10 people with failures does not equate to "left and right". If you want to be delusional, then so be it. And it's your car, you can do what you want, so if you want to listen to a bunch of wannabe engineers on the internet then
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03-12-2019, 10:50 AM | #191 |
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If we want to be more accurate with our terminology, then you could say that your car may be at risk of rod bearing failure if it is model year 2011. That's about the absolute most we can confidently say with no concrete number behind it. If your car may be at risk, then doing extra precautionary things like priming the oil system after an OFHG change or doing oil analyses every year/other oil change would be low-cost, high-value options.
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03-12-2019, 11:00 AM | #192 | |
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The only thing that still shows any correlation to me is the OFHG. As odd as it sounds there really does seem to be instances where people''s engines seize within an hour of doing the gasket for whatever reason... |
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03-12-2019, 11:05 AM | #193 | |
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03-12-2019, 11:12 AM | #194 | |
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omg look a 2012 that seized after an OFHG: https://x3.xbimmers.com/forums/showthread.php?t=1582839 omg and guess what it's an X3 and not an X5. Oh and even further look it's not on this forum!? OHHH EMMM GEEE and the holy grail of GOOGLE finds... https://www.reddit.com/r/E90/comment...ay_on_the_way/ AN N54 THAT SEIZED AFTER AN OFHG JOB. oh not wait... what was I thinking... this only happens to 2011 N55's. MY BAD derailing the thread guys... carry on. Last edited by bbnks2; 03-12-2019 at 11:29 AM.. |
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03-12-2019, 11:20 AM | #195 |
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Right this interesting video clearly states what the problem is: the fact that the N55 is lacking an oil priming pump function in the system thus allowing some air clog to happen in certain situations.
The question is, does the N55 use same oil pump/oil delivery/oil pickup system as the N54?
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03-12-2019, 11:22 AM | #196 | |
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lwgrenier was a 2011 rich_mane was a 2011 MartinWake was a 2011 MartinWake was a 2011 AydenBensink has knocking on a 2011 after OFHG Those who I mention or anyone else please correct me if I'm wrong but this is what I recall and have read. Oh, okay then I agree that doesn't help and focus more on 2011. |
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03-12-2019, 11:23 AM | #197 |
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OMG, 5 whole people? That's astounding.
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03-12-2019, 11:26 AM | #198 |
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