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      03-13-2024, 02:58 PM   #3015
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Technical discussions in this thread are nothing new, and are relevant.

Quote:
Originally Posted by PaulGros View Post
I have the complete data analysis from the OEM bearings that was rerun 02.02.2024 when I asked if the OE drawing could be checked. The following was rechecked:

Contact pressure
Bearing Hoop stress
Housing Hoop stress
Clearances

No anomalies were seen when compared to the original data. Unfortunately I can't share this data.

It's interesting that your list also contains OEM WPC treated bearings. My understanding of the process is it has a negligible impact on material dimensions, yet they are showing no wear even though clearance in theory is unchanged?
So just to confirm, the simulation was re-run with the original OEM bearings and the program confirmed the spec'd 0.046mm clearance is ok?

Re WPC bearings, I was wondering about that too.
Correct me if I'm wrong (memory's rusty here), but aren't WPC treated bearings ones which have had some sort of physical surface treatment (which minisculey increases the clearance, to no significant affect AFAIK) and also has some sort of coating over the bearing?
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      03-16-2024, 05:59 AM   #3016
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Quote:
Originally Posted by Assimilator1 View Post
Technical discussions in this thread are nothing new, and are relevant.


So just to confirm, the simulation was re-run with the original OEM bearings and the program confirmed the spec'd 0.046mm clearance is ok?

Re WPC bearings, I was wondering about that too.
Correct me if I'm wrong (memory's rusty here), but aren't WPC treated bearings ones which have had some sort of physical surface treatment (which minisculey increases the clearance, to no significant affect AFAIK) and also has some sort of coating over the bearing?
Sorry I missed this post.

Yes, the data from the OEM parts was rerun with the latest software version with no issues found.

As far as I know, WPC is a form of micro bead blasting with no coating applied
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      03-16-2024, 03:54 PM   #3017
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Quote:
Originally Posted by PaulGros View Post
Sorry I missed this post.

Yes, the data from the OEM parts was rerun with the latest software version with no issues found.

As far as I know, WPC is a form of micro bead blasting with no coating applied
Re WPC, yes that's it, I remember now you mention it!

Re OEM parts, are you allowed to tell us what clearance the simulation said it should be?
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      03-19-2024, 06:07 PM   #3018
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And this is what rod bearings should look like even after 130k miles! Jump to 2:50s to go directly to the bearing shots (bloody link goes to the beginning, even though 170s is in the link!!).
Thanks to Matt@Evolve for publishing this btw.



PS The fact that it's not a high revving engine is irrelevant (IIRC it's redline is ~7k).
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      03-20-2024, 03:48 AM   #3019
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Quote:
Originally Posted by Assimilator1 View Post
And this is what rod bearings should look like even after 130k miles! Jump to 2:50s to go directly to the bearing shots (bloody link goes to the beginning, even though 170s is in the link!!).
PS The fact that it's not a high revving engine is irrelevant (IIRC it's redline is ~7k).
I didn't look all though, maybe they said, but anyone who knows what clearance the S55 go with?
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      03-20-2024, 04:41 AM   #3020
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Quote:
Originally Posted by Assimilator1 View Post
And this is what rod bearings should look like even after 130k miles!
PS The fact that it's not a high revving engine is irrelevant (IIRC it's redline is ~7k).
S55 stock redline is 7600 rpms...at least one day in time would have been considered pretty high revving!
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      03-20-2024, 04:57 PM   #3021
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Quote:
Originally Posted by CSBM5 View Post
S55 stock redline is 7600 rpms...at least one day in time would have been considered pretty high revving!
Ah ok, that is a bit higher than I thought, and yes that is still pretty high I'd say . As I recall, the later M3/4s have a lower redline, perhaps that's where I got 7k from.
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      03-22-2024, 12:21 AM   #3022
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2008 e93 m3 : 50,070 miles
Done at MRF🤩
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      03-22-2024, 07:11 PM   #3023
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Quote:
Originally Posted by rajchalus View Post
2008 e93 m3 : 50,070 miles
Done at MRF🤩
Pics of the old bearings?
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      04-11-2024, 09:44 AM   #3024
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Here are my previously changed oem rod bearings:
44k km (~27k mls)
Summarized 3 days of trackuse
2 trackdays with BMW M, some laps on public driving (Hockenheim GP, Nürburgring GP, Nordschleife)
Oil was changed 5000-6000 km (3100-3800 mls)


The first rod bearings were replaced ~69k km (43k mls).
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      04-11-2024, 09:59 PM   #3025
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2010 E92 M3
Original bearings afaik
Replaced with BE Bearings & ARP Bolts by EAS in Anaheim
140,750 miles at the time of replacement
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      04-11-2024, 10:28 PM   #3026
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Quote:
Originally Posted by Assimilator1 View Post
Ah ok, that is a bit higher than I thought, and yes that is still pretty high I'd say . As I recall, the later M3/4s have a lower redline, perhaps that's where I got 7k from.
Redline has not changed on the s55 with 425 hp, 444 hp, 454 hp or 493 hp variants.
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