Official S65 Rod Bearing Condition Example Thread

[M3SQRD]

Originally Posted by RomanK

Guys, were there any cases when the enigne is blowned with BE bearings installed?

I’m aware of one engine that had BE bearings that failed but the failure was due to main bearing failure. The first RB, which was next to the main that failed, was scuffed up a little but did not spin. All of the others looked brand new. This was on a motor pretty much used primary on track.

[PiZauL]

Just put in BE bearings as preventative maintenance at 124,800 miles on my 2011 e90 M3. Looks like I didn’t need to but glad it’s done.

[M3SQRD]

Originally Posted by PiZauL

Just put in BE bearings as preventative maintenance at 124,800 miles on my 2011 e90 M3. Looks like I didn’t need to but glad it’s done.

Yes, they look pretty good for the mileage. However, by swapping to RBs with increased clearance, it minimizes the probability of an engine failure due to a RB(s). I know I feel more comfortable taking my two e92 M3s to 8600 rpm (stage two tunes with raised redline). I changed to BE RBs with BE/ARP 2000 rod bolts at 20k miles and 25k miles. For the mileage, some of my bearings (can’t find pics ��) looked worse than yours. Engines were always properly warmed up with < 3000 rpm and waited an additional 10 min after full redline is available to ensure engine, DCT and diff are at their appropriate operating temperatures. Anyway, congrats on your RB replacement.

[PiZauL]

Originally Posted by M3SQRD

Yes, they look pretty good for the mileage. However, by swapping to RBs with increased clearance, it minimizes the probability of an engine failure due to a RB(s). I know I feel more comfortable taking my two e92 M3s to 8600 rpm (stage two tunes with raised redline). I changed to BE RBs with BE/ARP 2000 rod bolts at 20k miles and 25k miles. For the mileage, some of my bearings (can’t find pics ��) looked worse than yours. Engines were always properly warmed up with < 3000 rpm and waited an additional 10 min after full redline is available to ensure engine, DCT and diff are at their appropriate operating temperatures. Anyway, congrats on your RB replacement.

Oh I definitely feel more at ease now that I know they’re done! Engine mounts were in rough shape so glad those are swapped too. Hoping to get many many reliable miles on this thing