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View Poll Results: Have you replaced your stock bearings? | |||
Yes, replaced them with extra clearance bearings | 136 | 47.22% | |
No, have not replaced them yet/not planning on replacing them | 152 | 52.78% | |
Voters: 288. You may not vote on this poll |
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02-23-2019, 08:13 AM | #89 | |
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While yes it should be possible to get it right, add in a busy shop environment, working on multiple cars, being interrupted, there is a chance it isn't done right. |
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02-23-2019, 12:21 PM | #90 |
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If you are worried the mechanic can’t torque stock rod bolts you should not let change your bearings. If your confidence level is merely that it should be possible for your mechanic to get it right, you should be using another mechanic.
The ARPs are easier and quicker to install. I have used both stock and ARPs on S65 rod bearing installs. They practically pay for themselves in reduced labor if you are paying a shop. They are also reusable, which save a little on the 2nd bearing change. I’d use ARPs for those reasons, but there is absolutely nothing wrong with stock bolts and any competent mechanic can install them properly. |
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02-23-2019, 10:05 PM | #91 |
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I'm planning on doing my rb's in the next two weeks, I have the arp625's and a set of acl standard shells that I was planning on using. I haven't heard much about the acl's, I purchased them a year or two ago because they were available at the time. I don't drive the car much and am doing this prep along with motor/trans mounts, new clutch and flywheel and a bunch of other pm for a supercharger install. The car only does 2k-3k mile a year, are the acl's gonna be ok for a couple of years? Should I just buy some BE's or ess spec cuz I've come this far and for the sake of $500 I don't wanna short change it. I'd be happy changing the acl's again in 15k-20k miles on a supercharged car that'll see some track time and spirited driving. Any thoughts or wisdom appreciated. TIA
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02-24-2019, 07:48 AM | #92 | |
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02-24-2019, 08:25 AM | #93 | |
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02-24-2019, 01:18 PM | #95 | |
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02-24-2019, 11:02 PM | #96 | |
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02-25-2019, 01:11 AM | #97 | |
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02-25-2019, 09:19 AM | #98 | |
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02-25-2019, 03:56 PM | #99 |
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Also have to be a little careful of bore distortion with the stronger ARP-625 bolts.
While this info is from BE, all of the raw info is available for your own review and analysis. Cheers,
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02-26-2019, 08:16 AM | #100 | |
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The ARP 2000 (also being used by BE) is a third of the 625 alloy price which I'm thinking also could be a reason to use them, as well as promoting them. |
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02-26-2019, 09:53 AM | #101 | |
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Personally, I was going to use BMW bolts until I realized that the cost of having to purchase an angle gauge that fits, the risk I screwed it up and the extra time it would take was not worth the savings. I was happy that BE offered a fastener with close to BMW bore distortion that also is sooooo simple to install. Cheers, Cheers,
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02-28-2019, 10:39 AM | #102 | |
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I haven't seen any ACL's pulled yet on an S65. Maybe on the V10? Of course, it'd also be nice to see more bearing options for this car, and if there is a consistency between all extra clearance bearing options having great results, this can help further understanding the root cause. |
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02-28-2019, 12:01 PM | #103 |
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BE also uses copper/lead as do one of the VAC bearings. Less risk of damage to the crank, though many cranks have been ruined by failing copper/lead bearings on these motors. All newer BMW do not use copper/lead bearings and do not seem to have bearing problems. It’s not the material that matters. It’s something else, and the theories abound from sulpher in the gas to driving style to warm up procedure to oil weight to engine tolerances to inadequate bearing clearance to poor knock sensing.
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03-01-2019, 06:50 AM | #104 |
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Not sure where I read this but one of the theories regarding rod bearing failure stated inadequately torqued rod bolts from the factory.
Who knows if it wasn't torqued right in the first place or became loose eventually with use. Apparently if rod bolts are not torqued adequately, the bearing clearance decreases further, thereby increasing chances of contact between rod bearing and crank. I believe there has been a detailed thread in this forum about this from 3 to 4 years ago... |
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03-01-2019, 07:53 AM | #105 |
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Yes, that is another theory. So many to choose from. And in addition to multiple options for replacement bearings, there are multiple options for replacement rod bolts — stock, Carrillo, ARP 2000 from BE or VAC and ARP 625 from lots of places.
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03-01-2019, 12:48 PM | #106 | ||||
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04-23-2022, 08:51 AM | #107 |
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So after all these years, it's about 50/50 between those who have changed their Rod Bearings and those who haven't.. Are you feeling lucky? I guess so..
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04-23-2022, 11:42 PM | #108 |
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04-24-2022, 06:41 AM | #109 | |
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04-24-2022, 01:54 PM | #110 |
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Some of these people were the most vocal against the idea. Two of the absolute most vocal naysayers did blow their motors with rod bearing failure. Both immediately left the forum. So getting answers might not be easily forthcoming.
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