05-31-2019, 09:38 AM | #23 |
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I'm not worried about this at all. The percentage of owners experiencing a crank hub spin is incredibly small - in respect to the overall circulation of S55 cars on the road.
The bearing BS with the S65 was a much bigger issue. "The tick of death" -That ruined my e92 M3.
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05-31-2019, 10:10 AM | #24 |
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Did they fight you on getting a new car? Seems like the right thing to do honestly.
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05-31-2019, 12:21 PM | #25 |
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thats pretty crazy, i wonder if they will fix these issues come 2021 MY.
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05-31-2019, 12:49 PM | #26 |
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If they haven't since the 2015 M3 they are not fixing it anytime soon.
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05-31-2019, 01:03 PM | #27 | |
Luxury at the redline :)
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You can roll the dice but I assume the approval would have to come from corporate and require a substantial amount goodwill with the dealer for them to even entertain the idea. |
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05-31-2019, 01:04 PM | #28 |
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Everyone, please take a look at the master Crank Hub thread.
https://f80.bimmerpost.com/forums/sh...php?p=24053449 Here is the crazy part - this issue seems to be related to people tuning their engines (not always), but the M2C is de-tuned. That should make the S55 even more reliable.
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05-31-2019, 01:20 PM | #29 |
Luxury at the redline :)
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^^^^^
Woah, that's more than I expected. And that's only the owners that actually responded to the poll.. Shame on BMW; I guess financially it wasn't beneficial for them to discontinue the motor early in comparison to the number of failures but that's an unacceptable amount IMO. Reminds me of this clip : |
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05-31-2019, 01:47 PM | #30 | |
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0 - 2014-2015 | 6MT | Stock | SCH Failure 0 - 2014-2015 | DCT | Stock | SCH Failure 1 - 2016 | 6MT | Stock | SCH Failure 0 - 2016 | 6MT Comp Package | Stock | SCH Failure 0 - 2016 | DCT | Stock | SCH Failure 0 - 2016 | DCT Comp Package | Stock | SCH Failure 0 - 2017 | 6MT | Stock | SCH Failure 1 - 2017 | 6MT Comp Package | Stock | SCH Failure 0 - 2017 | DCT | Stock | SCH Failure 0 - 2017 | DCT Comp Package | Stock | SCH Failure 0 - 2018+ | 6MT | Stock | SCH Failure 1 - 2018+ | 6MT Comp Package | Stock | SCH Failure 1 - 2018+ | DCT | Stock | SCH Failure 1 - 2018+ | DCT Comp Package | Stock | SCH Failure 5 cars. I believe the total M3/M4's built was 34,677+ Isnt that approx .01% That could be attributed to the tech putting the engine together, no? Someone check my logic.
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05-31-2019, 02:49 PM | #32 | |
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05-31-2019, 03:05 PM | #33 |
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Yep, the failure rate is not high, but I've seen more than 5 total stock failures just in the posts in the F80 section over the years. Not everyone takes the poll.
It would seem that power is not really the issue until you reach high levels. When the stock cars fail it might be some kind of manufacturing or vibrational issue. |
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05-31-2019, 03:32 PM | #34 | |
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You divide 5 cars into the number of people polled and even then all you're getting is enthusiast results |
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05-31-2019, 04:44 PM | #35 |
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The N55 has the same part. That means all of the M235i and OG M2s have the same potential issue. Many of the M3/M4s that had the problem we're modded. Many of them were DCTs with modded software ie. high power with a jerky tranny.
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05-31-2019, 05:00 PM | #37 |
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Deutsch Tech Published on Mar 9, 2019 In this video you will see an explanation of the S55 crankhub fix (BMW M2 Competition, F80 M3, F82 M4. It is a common fault on these engines for the crankhub to spin under harsh down changes and harsh accelerations causing significant engine damage. It has happened on standard cars as well as tuned cars. This keyed up is the solution as it is slotted into place with 3 pins so it cannot spin. |
05-31-2019, 05:02 PM | #38 | |
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I'm thinking it might be a proper bolt torquing issue. |
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05-31-2019, 05:07 PM | #39 |
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Recall reading it was due to cost savings on building the engine, although I'm not fully informed on the subject to dispute or confirm that. All I know is this has been happening on the s55 since it was first in production. I recall them replacing something, maybe it was the timing chain, can't recall, but the issue still persists. For shame BMW, for shame.
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05-31-2019, 05:21 PM | #40 |
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Not entirely true. This almost never seems to happen on N54 and N55s for whatever reason, even modded ones. S55 may have different vibrational / resonance behavior which causes this more often. It clearly isn't only power related as we have already seen 2 cases of stock M2C doing this, which is significantly detuned.
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05-31-2019, 05:24 PM | #41 | |
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Failures are a fraction of a percent. |
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05-31-2019, 05:25 PM | #42 | |
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Spun crank hubs have happened on N54, N55, and S55. It is a weak point of this generation of motors. Seen several cases reported on various BMW forums and from vendors on the forums. There was another N54 that spun a few months ago, it was a higher hp build. |
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05-31-2019, 05:34 PM | #43 |
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05-31-2019, 05:43 PM | #44 |
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You have BMW reliability stats or is that a random poll on some enthusiast website that's driving the hypothesis?
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