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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 Mon, Nov-13-2017, 08:48:30 PM   #21
Dirty Elf
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Default Re: Rod bearing pics - 2004 M3 motor w/93k miles

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Originally Posted by T3AMFiSh View Post
one is coated, one is micro pitted.. the WPC is technically micro pitted to let oil stay in the bearing
so personal preference is what it comes down to? is one more suited for race or street applications?
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Old Mon, Nov-13-2017, 09:37:44 PM   #22
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Default Re: Rod bearing pics - 2004 M3 motor w/93k miles

the wpc one maintains the clearances. the coated one may reduce it further. either way you need the measure the gaps with plastigage.
when i did mine, the gaps were all aroound the min tolerance.

to OP, my bearings looked very similar to your at 205k km (130k miles). if you use good oil, change regularly, let the engine warm up and exercise mechanical sympathy, the bearings could have lasted right up until 150k miles.
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Old Tue, Nov-14-2017, 02:35:01 AM   #23
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Default Re: Rod bearing pics - 2004 M3 motor w/93k miles

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Originally Posted by Dirty Elf View Post
any reason to not go with the VAC coated bearings vs the WPC OEM ones?



https://www.ecstuning.com/b-ecs-part...47835439wpckt/



vs



https://store.vacmotorsports.com/vac...s54-p1336.aspx

I had a motor rebuilt with VAC coated main and rod bearings. Last 12k miles with Ok maintenance, high oil temps, and lots of time near redline. Despite that, wouldn’t trust the VAC bearings. They reduce clearance and there are comparable or better alternatives available.


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Old Tue, Nov-14-2017, 02:37:55 AM   #24
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Default Re: Rod bearing pics - 2004 M3 motor w/93k miles

I also wouldn’t put VAC products in my engine
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Old Tue, Nov-14-2017, 02:38:31 AM   #25
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Default Re: Rod bearing pics - 2004 M3 motor w/93k miles

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The s65/e9X has rod bearing lottery failure (any mileage with any driving style), main bearing lottery failure (any mileage with any driving style) and rod bearing wear (more wear with more RPM usage, necessitating replacement as they wear out).



The S54 just has rod bearing wear (more wear with more RPM usage, necessitating replacement as they wear out)-- none of the lottery failures. Far less of an issue here, really just high revving engine maintenance.

I agree on the rod bearings, there isn’t a typical mileage range for failures. I replaced my bearings at 55k miles.

Main bearing failures have mostly involved superchargers and the first main bearing failing. Although most engines that have been pulled apart have main bearings that don’t look very good.


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Old Tue, Nov-14-2017, 04:04:43 AM   #26
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Default Re: Rod bearing pics - 2004 M3 motor w/93k miles

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Originally Posted by bigjae1976 View Post
I had a motor rebuilt with VAC coated main and rod bearings. Last 12k miles with Ok maintenance, high oil temps, and lots of time near redline. Despite that, wouldn’t trust the VAC bearings. They reduce clearance and there are comparable or better alternatives available.
Sounds like positive results, why don't you trust them? What are other alternatives?

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I also wouldn’t put VAC products in my engine
why is that?

Is the idea that the coating is added to OEM bearings and the thickness of the coating reduces the clearance... which is bad? Or is there something else going on here? My indy swears by VAC...
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Old Tue, Nov-14-2017, 06:31:40 AM   #27
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Default Re: Rod bearing pics - 2004 M3 motor w/93k miles

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Originally Posted by Dirty Elf View Post
Sounds like positive results, why don't you trust them? What are other alternatives?



why is that?

Is the idea that the coating is added to OEM bearings and the thickness of the coating reduces the clearance... which is bad? Or is there something else going on here? My indy swears by VAC...
I believe VAC applies some spray-on coating to "reduce friction". Not sure of the film or how it wears/lasts, but does not sound like the best approach. This reduces clearance so you don't get the appropriate amount of oil (of recommended weight) on the journals.

WPC is a treatment process which smoothes out the surface while also strengthening it (think of using super fine sand paper to get it as smooth as possible, except instead of sand paper it is achieved via bombarding the surface of the material with tiny tiny pallets which also strengthens it by packing the atoms closer together).

Needless to say, I'm on WPC in mine.
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Old Tue, Nov-14-2017, 12:07:43 PM   #28
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Default Re: Rod bearing pics - 2004 M3 motor w/93k miles

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Originally Posted by Dirty Elf View Post
Sounds like positive results, why don't you trust them? What are other alternatives?



why is that?

Is the idea that the coating is added to OEM bearings and the thickness of the coating reduces the clearance... which is bad? Or is there something else going on here? My indy swears by VAC...
I've had and seen enough bad experiences with VAC (they're close to me, so I get to see a lot of their disasters first hand) that I would never put anything speced by them on my car again. They're pretty unbelievably incompetent.
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Old Tue, Nov-14-2017, 02:12:18 PM   #29
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Default Re: Rod bearing pics - 2004 M3 motor w/93k miles

thanks for the info guys, ill talk it over with my indy and let you know what i end up going with
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Old Tue, Nov-14-2017, 02:13:20 PM   #30
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Default Re: Rod bearing pics - 2004 M3 motor w/93k miles

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Originally Posted by Obioban View Post
The s65/e9X has rod bearing lottery failure (any mileage with any driving style), main bearing lottery failure (any mileage with any driving style) and rod bearing wear (more wear with more RPM usage, necessitating replacement as they wear out).

The S54 just has rod bearing wear (more wear with more RPM usage, necessitating replacement as they wear out)-- none of the lottery failures. Far less of an issue here, really just high revving engine maintenance.
This makes perfect sense. Very helpful. Thanks,

maw
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Discussing Rod bearing pics - 2004 M3 motor w/93k miles 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)