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Old 12-08-2008, 01:48 AM   #1
therealkaisersoze
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Default WPC process anyone using it? Better than coatings?

I was just curious as it seems like WPC treatment is a very popular thing in Japan and some engines like NHRA drag cars etc.
Apparently it is a high velocity micro shot peening process. Seems like with the claimed increase in wear resistance it would be helpful on piston skirts, rings, cams and even bearings.
Anyone here using WPC?(i guess only one place in US does it since it is proprietary) Would the ideal be to have the parts treated with WPC and then apply coatings?
Interested as I might have to do a rebuild on my turbo miata. Just bought a cosworth shortblock for my subie so hopefully I won't have to worry about that engine for a while
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Old 12-08-2008, 01:55 AM   #2
benw
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shot peening works, is this just a more exotic form of it?

one thing I am a big believer in is the REM process, too.
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Old 12-08-2008, 09:41 AM   #3
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WPC does work well, though I haven't used it on one of my subie builds. I'm planning on testing it on my piston skirts, as I know boxer skirts are prone to some uneven abuse

^^WPC is a micro shot peening process that is used to help retain oil at the surface as well as harden the surface of the material.

I think cams and or cap/journals would be two other spots that would certainly be beneficial.
Sending out just the cam however and having its journals and lobs though would be much more cost effective than the heads and buckets. For big power, wrist pins too.
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Old 12-08-2008, 12:11 PM   #4
Schralperdotcom
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I just saw about WPC in lameass turbo mag.
what's the ROI? hp/durability vs cost, where peening is has a good ROI, especially on sumthin like polishin and peenin con rods.
why WPC vs. friction coating since there's only one place in the U.S that does WPC?
I can only see some of these treatments for full race or "check out how much $ i've got in my engine" crowd.
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Old 12-08-2008, 01:12 PM   #5
therealkaisersoze
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Well WPC seems interesting because it seems like it has the same advantages as shot peening but because the particles are so small they can actually embed stuff like molybdenum into the surface of the metal and decrease friction and unlike coatings it doesnt wear off quickly. Plus it since it uses such small particles it can be used on soft metals like bearings etc without really changing their relative sizes so clearances are minimally affected.
I am sure the horsepower gains would be minimal but durability might be significantly improved and I'm all for that. of course cost wise who knows? it doesnt sound cheap if you went all out just like coatings

What would be the ultimate combination of all these techniques cryotreating, WPC, coatings if money was no object?
Cryo all the parts first-pistons, crank rods, wrist pins
WPC treat the piston skirts, crank, rods, journals, bearings, cams etc
add friction coatings or maybe DLC to piston skirts to other frictional surfaces
for all that expense how much improvement do you think you could get?
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Old 12-08-2008, 04:59 PM   #6
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cryo'ing your pistons is pretty much a waste.
I however do recommend cryo for cranks, rods, wrist pins and rings.
WPC treat the skirts, wrist pins, rod and main journals, cam lobs and journals and bucket "skirts". Also valve stems if you are really "baller"

Realistically I think skirts would be the most beneficial vs coatings because coatings wear off rather quickly as they don't retain oil but are merely slick incase oil isn't present. The point of WPC is to harden and retain oil.

It is expensive and I don't think going all out would be very beneficial for most anyone. There are certain parts I think it would be beneficial for longevity purposes.
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Old 12-30-2009, 07:46 PM   #7
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here is everything you need to know about WPC. If your building an engine i suggest you read it. Assuming you do a coherent engine build WPC is a great and reliable form of insurance for your hard earned build. Make sure to read all 4 pages...

http://www.motoiq.com/MagazineArticl....aspx#Comments

Last edited by DoucheAlmighty; 12-30-2009 at 08:00 PM. Reason: haha i forgot to post the link....
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Old 12-31-2009, 01:42 AM   #8
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The MotoIQ link is a good one, and they also use the same treatment on a lot of their builds...

The Honda Ruckus has a full on WPC job done on a lot of parts in the engine and drivetrain. Their Sentra race car has the trans gears coated, and I'm pretty sure their EVO project cars as well.

A good site to read for all the potential applications for it.
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Old 12-31-2009, 03:13 AM   #9
DoucheAlmighty
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MotoIq has had some interesting articles for sure. Infact i think every project car i looked at there has wpc, from the ruckus like u said all the way up to a fully built nsx's engine, transmission, and lsd... Despite its cost (which isnt really that bad anyways) every builder should look into it. If the increased reliabilty isnt enough incentive there is strong belief there are power gains derived simply from engine internals staying well lubricated reducing drag.

Im not exactly sure why wpc isnt more mainstream in the U.S. outside of the racing world. Surely demand would be there if the tuning world was exposed to it so why hasnt that happened? If it blows shot peening out of the water one could assume its got an enormous market to tap into. Im pretty sure its already taken japan by storm....
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Old 12-31-2009, 04:40 AM   #10
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When 22B STi version project stated in Japan, there were many things STi staff didn't compromised until end of the project. One of them was WPC (Wonder process Coating) . And 22B is the only SUBARU Model which is applied WPC. NO WPC means NO 22B. Because of WPC is the patented item, it might hard to find outside of Japan. I think email to PENTAGON is the easiest way to find . really.
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Old 12-31-2009, 02:34 PM   #11
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On a side note, it looks like motoiq is getting paid to endorse WPC coatings... At least thats the way I'm reading into it...

I was just reading their new article on the Aprilla SR50, and it's WPC everywhere...

But this quote took the cake on page 1
Quote:
"The lustrous look is WPC treatment."
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Old 12-31-2009, 07:22 PM   #12
DoucheAlmighty
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i agree, at minimum theyre getting the service for free, maybe somebody else has more information on the subject that isnt potentially biased? Either way though i think the WPC writeup that motoiq has done has some pretty solid information and at minimum is intreigging
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Old 12-31-2009, 09:03 PM   #13
Sinister redlines
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Not the wpc process but I did use a ceramic slippery coating (same as slippery skirt coating) on my cam journals. Worked great, cams spin so smooth...
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Old 08-14-2012, 12:45 PM   #14
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I'm bumping this from the dead to see what impressions people have from actually using the process.

I'm all ears guys...
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Old 08-14-2012, 02:01 PM   #15
teiva-boy
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I'm using it on gears in a transmission for another application. I also did a piston and a set of rings for it as well. Though those haven't been installed.

If anything, I can say ,all sharp edges are gone from prior to the coating. And I think there is some lubricant that is embedded into the surface too as part of the blasting process.

So at this point I can say, it was inexpensive, extremely fast turn around, good communication from WPC, and I didn't have any problems installing at the very least the gears in the bike transmission I used it on.
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