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05-06-2024, 10:14 AM | #3037 |
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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.
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Assimilator1615.50 |
05-18-2024, 02:59 PM | #3038 |
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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.
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Assimilator1615.50 UPSROD1015.00 |
05-18-2024, 05:42 PM | #3039 |
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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.
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05-18-2024, 06:23 PM | #3040 | |
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05-27-2024, 05:56 AM | #3042 |
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Hard to see with oil on the bearings and being partially shaded (and only 1 pair there), that said, we can see the middle bearing has gone through some layers of lead. So yea, probably did need them.
Can you take a photo with all the bearings and without oil on them? Also, what year is your car and how many miles/kms has it done?
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Oil analysis for finding wearing rod bearings?. Collation of oil analysis reports with some rod bearing photos for the M3's S65. My categorisation of pulled rod bearings in the rod bearing condition thread. My updated 'Blown engines' list. |
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05-27-2024, 11:26 AM | #3043 | |
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06-02-2024, 07:37 AM | #3044 | |
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What year is your car? (I assume from 2007-2010).
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Oil analysis for finding wearing rod bearings?. Collation of oil analysis reports with some rod bearing photos for the M3's S65. My categorisation of pulled rod bearings in the rod bearing condition thread. My updated 'Blown engines' list. |
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06-02-2024, 07:39 AM | #3045 | |
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Two owners. First owner an old lady for 13 years. Then second owner for 6 months. Sold the car to get a Porsche. Just got the car back today actually. It sounds amazing. |
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06-02-2024, 07:52 AM | #3046 |
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Very nice
************************************************** On a separate note, for some years I've been keeping it in the back of mind to try to find some photos or videos of high mileage rod bearings (from any car engine) that are in good condition (like they should be), last week whilst researching what's involved in changing the timing chain on my 2010 330d (N57 engine, chain's noisy ), I came across the following video. It features a BMW N57 3 ltr turbo diesel engine, he was stripping it down to replace the main and rod bearings simply because the car had done 265k kms (~165k miles). As you can see in the video the rod bearings look almost brand new, whilst the mains show some light wear+discolouration, as seen in the thumbnail (very similar to how the tin/alu/copper bearings look in later S65s), he claims he can see copper on one of the mains, but in the video their isn't even a hint of copper showing! (and I can't say I agree with his claim that the mains are worn out either!). But anyway, that demonstrates that rod bearings can (and should) last far beyond 100k miles. Yes this engine only revs to ~5000 RPM (I think max is actually 5400, but power dies off 4500-5000 RPM), but in terms of combustion pressure pushing on the conrod it will be far higher than the S65. With the 4ltr S65s developing 295 lbft of torque, that's ~36.9 lbft for each cylinder, whilst the N57 in that car (he doesn't say what model, but does say it's a single turbo engine) produces 413 lbft, which is 68.8 lbft for each cylinder, much higher combustion forces! Also the N57 is a long stroke motor with a bore x stroke of 84 mm × 90 mm, vs 92mm x 75mm for the S65, so piston speed will be higher at same RPM for the N57. At 5k RPM the N57's average piston speed is 15 m/s, for the S65 it's 12.5 m/s @ 5K RPM, and @8k RPM it's 20 m/s, so yea the S65s average piston speed is higher at the upper end of the rev range, but perhaps not as much as you might think. So still a useful comparison I think.
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Oil analysis for finding wearing rod bearings?. Collation of oil analysis reports with some rod bearing photos for the M3's S65. My categorisation of pulled rod bearings in the rod bearing condition thread. My updated 'Blown engines' list. Last edited by Assimilator1; 07-04-2024 at 04:26 PM.. |
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07-03-2024, 10:48 AM | #3048 |
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Car was about having 60K miles and bearings where replaced at some point with VAC Clevite bearings.
** Not sure when exactly it was replaced my guess is around 40K miles Here is a picture of bearing number 8 Bottom https://files.fm/u/9s2dkbbxwq Top https://files.fm/u/m8ygpngu9q Last edited by Dopen93; 07-03-2024 at 11:12 AM.. |
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07-04-2024, 04:30 PM | #3049 | |
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Oil analysis for finding wearing rod bearings?. Collation of oil analysis reports with some rod bearing photos for the M3's S65. My categorisation of pulled rod bearings in the rod bearing condition thread. My updated 'Blown engines' list. |
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07-04-2024, 04:51 PM | #3050 |
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07-06-2024, 09:59 AM | #3051 | |
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Look a bit scored, how did the others look? (Btw, your photo site says they'll be deleted on July 17th, would be useful if they could stay there indefinitely).
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Oil analysis for finding wearing rod bearings?. Collation of oil analysis reports with some rod bearing photos for the M3's S65. My categorisation of pulled rod bearings in the rod bearing condition thread. My updated 'Blown engines' list. |
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08-23-2024, 10:03 PM | #3052 |
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Oct 2010 built E90 with 281,000km. Original bearings not looking great, but not horrendous either. The crank felt perfectly smooth.
I just finished fitting Mahle bearings with oe bolts myself. Now I need to go put the rest of the car back together. Number 4 was the worst. |
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08-24-2024, 01:40 PM | #3053 | |
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08-24-2024, 04:42 PM | #3054 | |
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No specific recommendation on bolts as far as I know, just to keep costs in check. Not that I want to be cheap with refreshing this car, but $300 saved here means $300 that can be spent in other locations, and the stock bolts seem to be more than strong enough, it's just the torquing sequence that's a pain the the ass, and it really is. But if you work methodically then it's not hard and you are essentially paying yourself $150 an hour for torquing bolts. The choice of bearings was dictated by BE being out of stock. If #4 looked like the others then I would have been almost disappointed to have done the job. |
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08-25-2024, 08:33 PM | #3055 | |
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The others look ok for the mileage!
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Oil analysis for finding wearing rod bearings?. Collation of oil analysis reports with some rod bearing photos for the M3's S65. My categorisation of pulled rod bearings in the rod bearing condition thread. My updated 'Blown engines' list. |
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08-25-2024, 09:08 PM | #3056 |
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Yeah, it looks odd with only the middle 50% of the RB seeing wear vs. the outer 25% on both sides showing little to no wear. As you stated, it does look like there was contamination and/or debris on this RB.
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08-26-2024, 12:20 AM | #3057 |
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I would agree yes, something got in there.
I did find some very small things in the oil pickups, and I have a theory about it. According to one of the invoices that came with the car the oil pan had a striped thread that was helicoiled. I assumed that the oil pan had been removed for this, but maybe not and some of the debris was still in there. |
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Today, 06:30 AM | #3058 |
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Just bought my '08 with 138k miles on original bearings in July. Glad I went ahead and replaced them quickly...
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