10-10-2019, 08:55 AM | #1 |
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MY 2018+ s55 crank hub issue
Hello,
This is the question everyone has in mind, i have read all topics of course technical discussions how much i don't understand; About s55 crank hub, what is common opinion? Did bmw make an update on my2018+ s55 engines? For example, does it progress like this; possibility stock %0,1 possibility stage1+ %5 possibility stage2+ %25 |
10-10-2019, 09:44 AM | #2 |
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No one has that info, not even BMW.
A part was updated but I think previous to 2018, in any case post 2018 engines can also suffer from this issue. In theory the forces on the crank hub should not change with a tune (they are dependent on the valvetrain). Want to be safe till your warranty runs out? Then don't tune the car under warranty! |
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10-11-2019, 09:09 PM | #3 |
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10-12-2019, 12:07 AM | #4 | |
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The engines are exactly the same between the M2C, M3, and M4, with the exception that the M2C is also detuned compared to the other two. Logical reasoning would deem that since power causes an increase in spun crank hubs, a detuned car would make it less likely to occur. So therefore the M2C should ideally have a lower chance of a spun crank hub compared to the M3 and M4 and should even have a little bit of tuning head space before the risk level exceed or catch up to what the M3 and M4 experience. If you're talking about low hanging udder as in the car is low that is irrelevant to the spun crank hub issue, that is another cause for concern in oil cooler damage from road debris. But this issue is easily fixed with the various underbody guards for sale. Or being extremely cautious and alert to any road debris and high points you may be driving over. Pretty much just being used to driving a low car.
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10-12-2019, 02:48 AM | #5 |
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F87source poster is being sarcastic and referring to the low hanging exhaust at the rear on the M2C.
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10-12-2019, 02:50 AM | #6 |
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Ahh that makes sense now, thanks for the clarification.
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10-12-2019, 04:37 AM | #7 | |
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10-12-2019, 05:04 AM | #9 | |
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As far as the oil cooler is concerned I feel it's potentially a bigger risk. None of this compares to the psychological trauma caused by prolonged exposure to seeing the udder. I believe a class action suit is warranted here, I mean really, WTF?? |
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10-12-2019, 09:00 AM | #10 | |
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Tons of completely stock M2Cs have had the issue. Any shock to the drivetrain can cause it. An over-rev on a down shift has caused it on a stock M2C. Think about it - what would more power have anything to do with it. I think a small percentage of S55s will just be more likely to have the problem. This could be due to some manufacturing tolerance or assembly difference or very slight material difference in the parts. I think the perfect combination of one of these susceptible S55s and driving style/incidents with cause the problem. A very smart tech said to me if your car is in that 1% that’s going to spin it’s hub, it doesn’t matter if you’re stock or modded or DCT or 6MT, it’s gonna happen at some point.
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Last edited by BroDoze; 10-12-2019 at 09:09 AM.. |
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10-12-2019, 10:25 AM | #11 | |
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Tons? Can you please post your data and sources for this? Otherwise - please don't spread rumors. To date I know of two M2C cars that reported having a SCH. Considering how many S55 M2C's have been built to date - that's nothing.
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10-12-2019, 11:01 AM | #12 |
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Tons? Can you please post your data and sources for this? Otherwise - please don't spread rumors.
To date I know of two M2C cars that reported having a SCH. Considering how many S55 M2C's have been built to date - that's nothing.[/QUOTE] Agree, I have never seen accurate data on Spun hubs on the S55. We all latch onto it because its a $$$$$ concern. I thought I remember a poll on the M3/M4 boards on whose cars it happened on and what options/tune it had as well. I still don't remember seeing that many % wise of total built... I'm going to wait until I track my M2c hard next year. If it doesn't spin it under those conditions I doubt it will with a tune. IMHO...
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10-12-2019, 11:19 AM | #13 |
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My dealer has had 3.
Stock M2C (downshift overrev) Stock M4 Modded M3 Many more stock vehicles my tech is aware of from friends, other dealers. I’m not spreading false numbers. What numbers do you have? Pontificating about more power is just as bad if not worse. |
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10-12-2019, 01:05 PM | #14 |
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Mr. "Tons of SCH on M2Cs", thats only 1 M2C. And in that case, if you over-rev, that's user error. You're lucky the crankhub even spun and did its job and protected your transmission and/or engine so they didn't blow up as a result. You fail to provide actual data, only rumours. To this date, like others have mentioned, there have only been two reported cases amongst the hundreds/thousands of M2Cs produced. That is less than 1%. Please come back when you have actual proof, thanks.
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10-12-2019, 01:30 PM | #16 | |
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https://f80.bimmerpost.com/forums/sh...php?p=24053449 https://f80.bimmerpost.com/forums/sh....php?t=1226184 What do you mean tons of M2C's have the issue, where your evidence? Why would an over rev even be relevant that's a driver mistake, normally that would result in bent valves anyways. Power would allow the engine to rev up faster putting more shock on the crank hub as it overcomes intertia from revving up. There have been threads saying it's not power related and more of the kick down from a dct causing the issue. There have been threads saying that it's neither and it's due to the dual hpfps driven off the cam causing more strain on the crank hub. There have been threads saying that the issue only started when they went higher horsepower. I guess the intention of my first post was to compare if the issue was caused by power since the drive train is identical on the M2C and m3, m4.
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10-12-2019, 01:34 PM | #17 | |
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Edit- I guess so do all claims if there isn't any supporting evidence from a large pool. I'll get all the threads that I talked about so you guys can also have a look.
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10-12-2019, 01:35 PM | #18 | |
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Loool the exhaust isn't even that bad.
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10-12-2019, 01:46 PM | #19 | |
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As my wife has an LCI I'm biased as her rear looks great... Last edited by 1mm2; 10-12-2019 at 01:53 PM.. |
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10-12-2019, 01:49 PM | #20 | |
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Source?
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10-12-2019, 01:51 PM | #21 | |
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It's also winter and road work season, no spring, summer or fall. Hahaha I guess it is nice not to see the huge muffler.
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10-12-2019, 01:51 PM | #22 |
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Odd, my dealer has had none yet two oils cooler punctures (M4s).
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