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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sun, Jan-29-2017, 09:39:47 PM   #21
Nicholas1996
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Default Re: King Racing Bearings

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Originally Posted by Braymond141 View Post
Just wondering to what degree WPC bearings are known to work?
Quote:
Originally Posted by Flow View Post
+1 to that.
No real hindsight on that since it is pretty recent. Doesn't the WPC treatment reduce even more the very tight clearance ? I guess that discussion is already somewhere. I need to look it up.
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Originally Posted by bimmerfan08 View Post
2 for 2. Glad to see others on here with similar mentalities.
Good to see others with open minds and to question what is the norm.
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Old Sun, Jan-29-2017, 10:11:29 PM   #22
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Default Re: King Racing Bearings

yeah it does reduce the tolerance but its like .0004".. which allows more oil to be between the journal and bearing which is what WPC treatment is designed to do.. its supposed to allow oil to cling to the bearing more
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Old Mon, Jan-30-2017, 12:08:27 AM   #23
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Default Re: King Racing Bearings

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Originally Posted by T3AMFiSh View Post
yeah it does reduce the tolerance but its like .0004".. which allows more oil to be between the journal and bearing which is what WPC treatment is designed to do.. its supposed to allow oil to cling to the bearing more
Key word in your post

I have WPC treated bearings in my S54 as do many. We are all hoping based on the results of this treatment in other applications that it extends the life of the bearings and provides better performance. But we have no concrete data on what results or longevity we can expect in S54s. Our engines for now are guinea pigs until more miles are put on these bearings, more oil analyses are performed, and whatever other data we can document is captured.
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Old Mon, Jan-30-2017, 12:50:02 AM   #24
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Default Re: King Racing Bearings

Quote:
Originally Posted by Braymond141 View Post
Just wondering to what degree WPC bearings are known to work?
Quote:
Originally Posted by Flow View Post
+1 to that.
No real hindsight on that since it is pretty recent. Doesn't the WPC treatment reduce even more the very tight clearance ? I guess that discussion is already somewhere. I need to look it up.
Quote:
Originally Posted by bimmerfan08 View Post
2 for 2. Glad to see others on here with similar mentalities.
Quote:
Originally Posted by Nicholas1996 View Post
Good to see others with open minds and to question what is the norm.
If anything it increases clearance by nature of the process. The tech trickled down from pro racing. The science behind it (shot peening/work hardening the metal surface) is sound. It reduces the friction surface area while also leaving a stronger surface (note lower surface area of teh WPC part since it now has many tiny valleys http://www.wpctreatment.com/about.htm). Like any other surface treatment or coating, I doubt there will ever be any experimental proof of the benefit in an S54.



Last edited by m3 hal; Mon, Jan-30-2017 at 12:57:32 AM.
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Old Mon, Jan-30-2017, 01:42:53 AM   #25
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Default Re: King Racing Bearings

the details on how it works seem to be a little light on details.

i assume when they mean reduced friction it affects the fluid film boundary layer, or do they mean its reduced friction when the film is overloaded and there is metal to metal contact only?

also how does the process affect the embedability of the bearing, isnt the top layer actually quite soft deliberately ? the process may not change the harness of the top layer though

does anyone know if any OEM use it on their bearings?
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Old Mon, Jan-30-2017, 03:23:07 AM   #26
m3 hal
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Default Re: King Racing Bearings

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Originally Posted by digger View Post
the details on how it works seem to be a little light on details.

i assume when they mean reduced friction it affects the fluid film boundary layer,
More bearing surface area is exposed due to the small dimples, resulting in an increased volume of oil on the bearing.
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Old Mon, Jan-30-2017, 08:37:21 AM   #27
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Default Re: King Racing Bearings

Quote:
Originally Posted by Flow View Post
+1 to that.
No real hindsight on that since it is pretty recent. Doesn't the WPC treatment reduce even more the very tight clearance ? I guess that discussion is already somewhere. I need to look it up.
Quote:
Originally Posted by bimmerfan08 View Post
2 for 2. Glad to see others on here with similar mentalities.
Quote:
Originally Posted by Nicholas1996 View Post
Good to see others with open minds and to question what is the norm.
Thank you for not chastising this (ugh).

Personally I'm having a hard time choosing what bearing route I want to take. This topic is right up my alley as this bearing came up in my search. Lang suggested King for the mains, I'll see if a rod bearing suggestion came up. He does have sort of a negative opinion on his site about WPC citing the tighter clearance after treatment.

I already purchsed a full OEM set, but with an unexpected need to grind the crank, I'm back to sourcing an oversize rod bearing set. Very interested in more views.

Last edited by Braymond141; Mon, Jan-30-2017 at 08:40:30 AM.
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Old Mon, Jan-30-2017, 02:42:16 PM   #28
Nicholas1996
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Default Re: King Racing Bearings

Quote:
Originally Posted by Braymond141 View Post
Thank you for not chastising this (ugh).

Personally I'm having a hard time choosing what bearing route I want to take. This topic is right up my alley as this bearing came up in my search. Lang suggested King for the mains, I'll see if a rod bearing suggestion came up. He does have sort of a negative opinion on his site about WPC citing the tighter clearance after treatment.

I already purchsed a full OEM set, but with an unexpected need to grind the crank, I'm back to sourcing an oversize rod bearing set. Very interested in more views.
I believe king make an oversized set.

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Old Mon, Jan-30-2017, 03:53:39 PM   #29
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Default Re: King Racing Bearings

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Originally Posted by Braymond141 View Post
Lang suggested King for the mains
Aren't the mains color coded and you need to order the same color bearing as the marking on the crank ? Or how does this work ?
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Old Tue, Jan-31-2017, 12:48:55 AM   #30
Nicholas1996
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Default Re: King Racing Bearings

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Originally Posted by Flow View Post
Aren't the mains color coded and you need to order the same color bearing as the marking on the crank ? Or how does this work ?
Also curious.
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Discussing King Racing Bearings in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)