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      10-24-2016, 09:25 AM   #1
Jims M3
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Bearing and Oil replacement choices

I used the search key and read many threads on this forum about bearing choices, but is their a definitive opinion on the bearing choices out there? I am getting mine done on Friday and the information is confusing, some of the threads are old and may not represent the latest technology.

Also my shop uses Motul oil, and recommended it for replacement in my car the weight is 15w50, I can't find any threads on Motul as a choice in this forum either.

Any help is appreciated, job is getting done Friday.
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      10-24-2016, 09:37 AM   #2
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BE Bearings, hands down. Only ones that actually fix the clearance issue.
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      10-24-2016, 10:56 AM   #3
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I always prefered motul myself, its what ill be running on my new stroker though a lighter weight.
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      10-24-2016, 11:20 AM   #4
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You might have heard of a BMW shop called RRT. They just did the rod bearing swap on my car. I used BE Bearings with OE rod bolts and they recommended Motul 300v 15w50. So that's what I've got. I might go back to 10w60 but the price for Motul twice a year isn't that bad, all things considered.
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      10-24-2016, 11:38 AM   #5
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Quote:
Originally Posted by Nihilation View Post
You might have heard of a BMW shop called RRT. They just did the rod bearing swap on my car. I used BE Bearings with OE rod bolts and they recommended Motul 300v 15w50. So that's what I've got. I might go back to 10w60 but the price for Motul twice a year isn't that bad, all things considered.
Curious about your decision to use OEM what decided that for you?
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      10-24-2016, 11:46 AM   #6
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Quote:
Originally Posted by Jims M3 View Post
Curious about your decision to use OEM what decided that for you?
Creates the least amount of bore distortion.
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      10-24-2016, 11:57 AM   #7
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I used VAC Bearing which have more clearance and Motul 300V 15w50
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      10-26-2016, 07:47 AM   #8
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I didn't think getting BE to respond would be this hard, they have no phone number and don't respond to emails I have sent. Not very re-assuring, they say they are on back order until Nov. 1st, but who knows if they won't respond.
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      10-26-2016, 10:43 AM   #9
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Curious, why are you guys going for 15w50? That stuff will be even thicker at startup than a 10w60, which is the crucial time when you get accelerated wear.
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      10-26-2016, 11:38 AM   #10
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Quote:
Originally Posted by dparm View Post
Curious, why are you guys going for 15w50? That stuff will be even thicker at startup than a 10w60, which is the crucial time when you get accelerated wear.
?
I agree. Why 15w?

I mix RL 10w60 and 5w50 for that line of reasoning.
Hey dparm--- with 6/3.5 mix, what would you estimate final weight? You like to calc that stuff don't you?
8w55?
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      10-27-2016, 12:31 PM   #11
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Quote:
Originally Posted by 330indy View Post
?
I agree. Why 15w?

I mix RL 10w60 and 5w50 for that line of reasoning.
Hey dparm--- with 6/3.5 mix, what would you estimate final weight? You like to calc that stuff don't you?
8w55?

The only reason I see to use 15w50 is that it *might* be a bit more shear stable than a 10w60, and that it would increase oil pressure at startup. My biggest fear is that it is very thick at startup and just won't flow into the bearings and other important areas fast enough. Red Line's own 15w50 has a low VI of about 162 .

Haha. I'd just focus on what your final HTHSV ends up at since that's the best indicator of operational viscosity. RL 10w60 is really thick to start with (thicker than most other 10w60s).
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      10-27-2016, 02:39 PM   #12
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Motul has a new 8100 xpower 10w60. Wondering if anyone has any experience with it
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      10-27-2016, 02:48 PM   #13
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Quote:
Originally Posted by Green-Eggs View Post
BE Bearings, hands down. Only ones that actually fix the clearance issue.
VAC Bearings are the only proven ones so far
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      10-27-2016, 03:02 PM   #14
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Quote:
Originally Posted by doogee View Post
VAC Bearings are the only proven ones so far
Proven how? Can anybody point to one piece of research VAC did on these bearings, one measurement they did, one test they performed, or one piece of Data they published? I've never been able to find any. I've only seen customers as guinea pigs, taking their own measurements etc. The teardowns I've seen have all been with VAC bolts that cause bore distortion and increased clearance due to that. Any of those known faulty assemblies need to be thrown out.

Now, compare that to this. This article is not completed, but take a look at what it really means to test and prove something.
http://wiki.rcollins.org/core/index.php/Oil_Flow_-_S65_Oil_Flow_Analysis
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      10-27-2016, 03:07 PM   #15
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Quote:
Originally Posted by Green-Eggs View Post
Proven how? Can anybody point to one piece of research VAC did on these bearings, one measurement they did, one test they performed, or one piece of Data they published? I've never been able to find any. I've only seen customers as guinea pigs, taking their own measurements etc. The teardowns I've seen have all been with VAC bolts that cause bore distortion and increased clearance due to that. Any of those known faulty assemblies need to be thrown out.

Now, compare that to this. This article is not completed, but take a look at what it really means to test and prove something.
http://wiki.rcollins.org/core/index...._Flow_Analysis
Sorry dude, there have been enough REAL WORLD examples of good mileage put on the bearings showing no wear to know they work. You can't argue it anymore.
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      10-27-2016, 03:10 PM   #16
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Quote:
Originally Posted by e92m3jb View Post
Motul has a new 8100 xpower 10w60. Wondering if anyone has any experience with it
It's a little bit thicker than TWS or the new BMW-branded 10w60. I'm sure it would work fine, but sometimes the Motul oils (especially rare or new ones like this) can cost more than the OEM stuff!

Kinda disappointed they don't have a 10w60 in the 300V line as I'd probably snatch that up.
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      10-27-2016, 03:30 PM   #17
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      10-27-2016, 04:01 PM   #18
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Quote:
Originally Posted by Green-Eggs View Post
Proven how? Can anybody point to one piece of research VAC did on these bearings, one measurement they did, one test they performed, or one piece of Data they published? I've never been able to find any. I've only seen customers as guinea pigs, taking their own measurements etc. The teardowns I've seen have all been with VAC bolts that cause bore distortion and increased clearance due to that. Any of those known faulty assemblies need to be thrown out.

Now, compare that to this. This article is not completed, but take a look at what it really means to test and prove something.
http://wiki.rcollins.org/core/index...._Flow_Analysis

Interesting page, bookmarked. The pressure values mostly confirm the old-school "10psi of oil pressure per 1,000 rpm" rule that muscle car builders used back in the day.
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      10-27-2016, 04:24 PM   #19
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Quote:
Originally Posted by doogee View Post
Sorry dude, there have been enough REAL WORLD examples of good mileage put on the bearings showing no wear to know they work. You can't argue it anymore.
Well I've been asking if anybody has any examples with OEM rod bolts, not bolts that have the wrong clamping force and distort the bore. If you have links to any, I'll be happy to take a look. Then we can argue whether or not visual inspection without measurements means anything or not. But let's start with links of teardowns with OEM bolts if you know of any.
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      10-27-2016, 05:51 PM   #20
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Quote:
Originally Posted by dparm View Post
Interesting page, bookmarked. The pressure values mostly confirm the old-school "10psi of oil pressure per 1,000 rpm" rule that muscle car builders used back in the day.
Is not one of the advantages of the (S65) pendulum type slide valve with the in built pressure valve that the oil pressure is not linear with engine rpm...rather that it produces higher pressure (than old school oil pumps) at low rpms and keeps it at the pressure setting throughtout the rev range?
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