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      10-12-2019, 01:30 PM   #16
F87source
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Drives: Bmw M2
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Quote:
Originally Posted by BroDoze View Post
Show me any sort of proof more power causes more crank spun hubs.
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.
Here's the master thread and survey poll for the s55.
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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