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      03-07-2019, 10:33 PM   #1
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S55 teardown (English Captions available)

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Found this video online of some unfortunate soul's S55 being repaired. Had to toggle the English subtitles to know what was going on.

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, 01:06 AM   #2
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Interesting. Wasn't this "Screw" issue corrected after a few years of production. Forgot the correct english term.
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      03-08-2019, 01:43 AM   #3
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Quote:
Originally Posted by 3tekcorps View Post
Interesting. Wasn't this "Screw" issue corrected after a few years of production. Forgot the correct english term.
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, 02:59 AM   #4
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And those 'fixes' you see on the internet, will they do the job properly?


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      03-08-2019, 03:05 AM   #5
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Quote:
Originally Posted by Robin_NL View Post
And those 'fixes' you see on the internet, will they do the job properly?


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Other than the keyed / one-piece solutions, no one knows for sure I'd guess.

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, 03:56 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, 11:42 AM   #7
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Quote:
Originally Posted by cntzl View Post
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.
Very strange. Seems like it should be an easy fix to an otherwise wonderful engine.

PS

Where are the N55 guys talking about how awesome it sounds after seeing that block comparison!
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      03-08-2019, 03:33 PM   #8
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Fascinating. I've always wondered about the differences between the N55 and S55.

Thanks for sharing this video.
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      03-08-2019, 08:57 PM   #9
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Enjoyed it
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      03-09-2019, 07:56 AM   #10
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Quote:
Originally Posted by chris719 View Post
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.
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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      03-09-2019, 08:58 AM   #11
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Quote:
Originally Posted by 3tekcorps View Post

Where are the N55 guys talking about how awesome it sounds after seeing that block comparison!
If I ever take my engine apart and have an S55 available for comparison, I'm sure to be impressed by the differences.
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      03-11-2019, 05:52 PM   #12
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Quote:
Originally Posted by chris719 View Post
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.
An M3 with rod bearing issues??? Who would have thought
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      03-11-2019, 05:59 PM   #13
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Quote:
Originally Posted by ItsGary View Post
An M3 with rod bearing issues??? Who would have thought
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   #14
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Quote:
Originally Posted by chris719 View Post
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.
hehe, hopefully this crankhub thing gets a recall or something
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      03-11-2019, 06:03 PM   #15
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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   #16
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Quote:
Originally Posted by switlikbob View Post
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.
I really doubt bmw would go out of their way to forge the internals of the m2. Especially when power output for non-m n55 motors are the same as the m2.
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      03-11-2019, 06:08 PM   #17
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Quote:
Originally Posted by switlikbob View Post
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.
No mechanical differences between any n55 engine regardless of what car/suv it was in
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      03-11-2019, 06:10 PM   #18
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Quote:
Originally Posted by 3tekcorps View Post
Quote:
Originally Posted by cntzl View Post
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.
Very strange. Seems like it should be an easy fix to an otherwise wonderful engine.

PS

Where are the N55 guys talking about how awesome it sounds after seeing that block comparison!
Right, let's compare an attribute that we can hear and enjoy every time we go WOT with something that we need to tear the engine down to see or mod to feel the difference.

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   #19
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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   #20
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Quote:
Originally Posted by xcusem3 View Post
No mechanical differences between any n55 engine regardless of what car/suv it was in
This is false. The N55B30T0 (M2) has a few differences over the N55B30O0 (everything else). S55 crankshaft bearings, S55 pistons, modified oil supply sump with addition of suction return pump, wiring harness and spark plugs from S55, additional oil cooler and aux coolers.

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   #21
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Quote:
Originally Posted by 3tekcorps View Post
Where are the N55 guys talking about how awesome it sounds after seeing that block comparison!
N55 sounds awesome!

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      03-11-2019, 06:49 PM   #22
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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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