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09-23-2019, 09:51 AM | #1189 |
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If high revs on a cold engine caused fast bearing destruction, every rental vehicle on earth would spin bearings monthly.
The rotating assembly in an S65 follows the same laws of physics that a Honda/Toyoya/Mazda/Ford/Chev/Volvo does. If bearings are properly designed, they are not fragile. If the oiling system is designed properly, then cold running will not damage bearings because all you need is flow to make the bearings work. No, I do not propose that you flog your engine while cold. It is good practice to warm it up. But BMW limits the cold RPM redline to a value that will protect the engine so there is no way that the damage we see can be consistently attributed to cold engines at high loading. Cheers,
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09-23-2019, 01:59 PM | #1190 |
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Rod Bearings at 85k honestly the looked fine
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09-23-2019, 03:33 PM | #1194 | |
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09-23-2019, 03:34 PM | #1195 | |
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Even if they could, why would they then advise keeping it under 3500 RPM when cold? The cold rev limit was most likely a compromise between limiting engine damage and allowing short bursts of high RPM in case the situation demands it. I agree that cold revving can't explain the rod bearing issue on this engine, but nor should we suggest leaning on the rev limit to protect the engine. |
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09-23-2019, 04:31 PM | #1196 | |
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The S65, while a nice piece of engineering for the street, is not really a race engine. The rotating assembly in the S65 follows the same laws of physics that Mercedes, Ferrari, Audi, Lexus, Honda, Suzuki, Toyota, Yamaha, Ford, Chev etc. all have to follow. Yes it revs high, but no higher than a number of other similar displacement-per-piston NA high revving engines. We do not see the Audi R8 V10 forums inundated with spun bearings and premature bearing wear (the Audi V10 has a higher redline, higher mean piston speed and a larger HP/L output than the S65). Nor do we see complaints in forums for Honda, Ferrari, Porsche etc. Search for Audi R8 v10 spun rod bearing and you find a single post from 2011 that sounds like a bad luck bear bit the guy in the ass while the car had full warranty. BMW screwed the pooch on the bottom end of this engine. Most of their problems would likely have been avoided if they had simply hand built the engines from "binned" assemblies that guaranteed their design tolerances were actually maintained. Since they did not do this, we get to play the German lottery - where winners are really losers. I bet you, that somewhere, there is a German engineer that works(ed) for BMW that has a memo that he/she drafted advising management that the S65 rotating assembly design is compromised - but for fear of getting fired, they just filed it somewhere safe. Oh, to be a fly on the wall some days...
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09-23-2019, 04:53 PM | #1197 |
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Those are very nice. You chose your M3 wisely.
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09-23-2019, 05:18 PM | #1198 |
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MY 13 with 21k miles. Super glad I had this done.
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09-24-2019, 12:08 AM | #1199 | |
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Cheers |
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09-24-2019, 12:10 AM | #1200 |
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09-24-2019, 12:34 AM | #1201 | ||
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Sorry bout that everyone. We should discuss cold engine care elsewhere.
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09-24-2019, 05:57 AM | #1202 |
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Do you know the history of the engine to be assured that those had not been replaced prior to your ownership? Those look almost a darker color, like they may be WPC treated bearings. Condition-wise, they look great, better than any S65 I've ever seen if the mileage is true.
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09-24-2019, 06:03 AM | #1203 |
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Some recent ones. The last one came in with a slight knock and metal in the oil.
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09-24-2019, 09:03 AM | #1204 |
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09-24-2019, 09:21 AM | #1205 | |
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The engine from the last picture has to have a full teardown and rebuild now. Definitely not good. |
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09-24-2019, 09:46 AM | #1206 | |
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09-24-2019, 11:26 AM | #1207 |
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Wow
What oil ? What OCIs ?
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09-24-2019, 11:44 AM | #1208 | |
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I took the car into my mechanic and he says all the motor mounts, throttle actuators are new. Which lines up with what the seller said. As far as being the original bearings or having been replaced I have no Idea.... If anyone has seen that photo posted before I would really like to know. I want to give the guy the benefit of doubt. Edit: Just for clarification the photos came from the seller, I have not seen the rod bearings for myself. Last edited by ----Flyin-High----; 09-24-2019 at 12:10 PM.. |
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09-24-2019, 11:49 AM | #1209 |
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This is the car purchased
https://www.ebay.com/itm/2011-BMW-M3...72.m2748.l2649 I was going to install a supercharger, I am nervous about the rod bearings. My shop mechanic said its one of the cleaner M3s he has seen, hopefully i got the unicorn, and not a fraud. |
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09-24-2019, 12:02 PM | #1210 | |
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The Ad lines up with what Deansbimmer suspected: Maintenance items within last 2k miles: WPC Coated OEM Bearings w/ OEM Bolts Looks like it was well taken care of then, I wouldn't worry about it too much. Enjoy it.
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