03-07-2019, 09:33 PM | #1 |
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S55 teardown (English Captions available)
Featured on BIMMERPOST.com I wish the camera work was better and spent more time on the engine and not the guys doing the work but oh well. Fascinating to see the difference between the S55 and N55! |
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03-08-2019, 12:43 AM | #3 |
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Crank hub issue is not addressed by BMW. They switched to a new bed plate after MY2016 when Comp Package was introduced but there are still cases of spun crank hub happened to bone stock 2018 M3/M4s.
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03-08-2019, 02:05 AM | #5 | |
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The failure is relatively rare, so it's difficult to prove in normal operation. You could install it, but maybe your hub wasn't going to spin anyway. I'm sure some tuners could produce it reliably at very high power levels, but this testing sounds expensive. |
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03-08-2019, 02:56 AM | #6 |
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The rod bearings don't look so hot for such a low mileage engine... .
There haven't been any reports of rod bearing failure on S55 that I've seen yet though. |
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03-08-2019, 10:42 AM | #7 | |
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PS Where are the N55 guys talking about how awesome it sounds after seeing that block comparison! |
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03-09-2019, 06:56 AM | #9 |
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He didn't go into it in the video, but if the valves hit the pistons, it wouldn't be surprising to see wear, maybe in some cases major wear, on the upper rod bearings (pressure side in his terms).
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03-11-2019, 05:52 PM | #11 |
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An M3 with rod bearing issues??? Who would have thought
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03-11-2019, 05:59 PM | #12 |
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Yeah... to be fair, it might be due to the valves hitting the top of the cylinder as mentioned above.
I also don't think I've come across even a single S55 rod bearing failure post yet. At this point in S65's lifetime the thread was already pretty long. |
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03-11-2019, 06:01 PM | #13 |
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hehe, hopefully this crankhub thing gets a recall or something
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03-11-2019, 06:03 PM | #14 |
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I haven't been following the engine stuff for a while now. Is this a comparison of an M2's N55, or another non m version?
I remember reading that the M2 had forged internals versus the non m versions of the n55. Is this still an accepted fact, or has it been debunked? I even remember people saying that the n55 in the M2 was closed deck, which we know to be false. Closed deck vs. open deck debates can go on all day long. We all know that the s55 can make more power more easily and more reliably, unless you have the hub issue. We also know that the n55 in the M2 sounds nasty and is no slouch and the power department either. I personally know of a handful of people making over 500 whp easily. And I know of at least two are making over 700 WHP on their n55's. So at this point it really comes down to reliability. |
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03-11-2019, 06:07 PM | #15 | |
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03-11-2019, 06:08 PM | #16 | |
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03-11-2019, 06:10 PM | #17 | ||
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Oh yes, I have a closed deck block on my under warranty M2C heavy, which I swear I'm gonna mode to 600whp down the road. I'll let y'all have the awesome engine with the horrible sound. |
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03-11-2019, 06:11 PM | #18 |
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Where did you get this info regarding forged internals? I don't personally know of anyone who has torn down an F87 N55. Do you?
As for BMW doing weird things for seemingly no good reason; they have, and do. |
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03-11-2019, 06:32 PM | #19 | |
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See the M2 Technical Training manual from 2016. Also, the M2 turbo is a different part #, however it is uncertain if there are any actual changes to it. Last edited by PackPride85; 03-11-2019 at 07:36 PM.. |
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03-11-2019, 06:38 PM | #20 |
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03-11-2019, 06:49 PM | #21 |
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Also worth noting that N55 line doesn't just differ in the M2. As an example, the M235i when it first came out had a forged crankshaft whereas the rest of the line up didn't.
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03-11-2019, 07:45 PM | #22 |
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See, BMW does do strange and unthinkable things to their engines. I'm happy for the clarifications here guys / gals.
One thing is for sure... New rod bearings replaced at a 70k mile interval are a shit-ton cheaper than new pistons and valves. |
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