The Dog car

WPC Treatment Saved Our Engine!
By Mike Kojima


We had just installed a freshly built SR20DE engine for the Dog Car.  This is the B14 Nissan Sentra race car that we have been campaigning for many years in road racing and time attack which had been sitting dormant since 2006.  With the advent of Redline’s MPTCC race class we decided to dust the car off, freshen it up and have Formula D drifting ace Dai Yoshihara campaign the car in the TU class.


The dog car
The world famous Dog Car not only survived running at race speed with low oil pressure, it actually won.  It also proved that you should always carry a mechanical oil pressure reference gauge or believe your electrical one.


We had rebuilt an SR20DE engine for a 200SX SE-R street car that we no longer owned and it was sitting around gathering dust so we decided to install that engine in the car. You can read about that build here!  This freshened up engine produced around 180 whp and 143 lb/ft of torque and made extensive use of WPC treatment, the Japanese super finishing technology that we have found to work quite well.  You can read about how WPC works here!


WPC Saved Our Engine!
Engine bearings are one of the most easily damaged components of an engine due to a loss of oil pressure as they are made of soft metal that depends on a continuous film of pressurized oil to survive.   The Calico main bearings on our engine only had the coating burnished off in some areas.  The bearing metal was undamaged except one bearing got a light scratch from a small piece of debris with low oil pressure.  These bearings could be reused.


All went well during the MPTCC race and Dai drove the car to an easy win.  We had noted severe oil pressure fluctuations all weekend and several moments of near zero oil pressure which we had attributed to a faulty sending unit.   After the race we changed the sender unit and sent the car off to our sponsors Jim Wolf Technology for a cam swap and dyno tuning in search of more power for the upcoming Liberty GP at Willow Springs.


WPC Saved Our Engine!
The rod bearings are also nearly perfect with only some burnishing of the bearing coating.


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Eric L
Eric Llink
Tuesday, July 19, 2011 10:53 PM
I wished I remembered to WPC my Toda cams and valvesprings. Too late now. :(

If/when I do my internals, will definately WPC!
Wednesday, July 20, 2011 1:56 AM
Good thing I WPC treated some of my engine parts on my current build. Sucks I didn't have the money to do it all though, just a few parts. I DID do the rocker arms though!!!
Wednesday, July 20, 2011 2:53 AM
Wow... if anyone wasn't already sold on WPC treatment, this article should be convincing enough!
Wednesday, July 20, 2011 3:33 AM
That is really impressive. Sounds like the treatment was well worth it's weight in saved engine parts! I'm going to push WPC on my team's SAE engine. We are rebuilding our bored race motor and we should pick up some power and fuel mileage if we go this route.
Der Bruce
Der Brucelink
Wednesday, July 20, 2011 7:47 AM
Allright, I have to ask the sticky question but how much does it typically cost? Per part or per weight? I looked through the WPC site but to no avail :( I may want to go this route with the 302 aka 5.0 in my boat if things are worse than I hope when we get into it next week.
Wednesday, July 20, 2011 7:58 AM
I had a nissan pump (ka24de) fail that same way, it was a PITA to diagnose,

I don't put any motors together now with out tearing down the pump first and de-burring and radiusing that port and the piston,

Dusty Duster
Dusty Dusterlink
Wednesday, July 20, 2011 10:26 AM
I'm with Bruce. How much to do everything in a V8?
Wednesday, July 20, 2011 12:12 PM
I do not blame you SkullWorks, seeing this article makes me want to get a blueprinted turbo auto 300ZX oil pump and tear my DD's engine apart just to put it in.

8695Beaters, Formula SAE? If so I'm jealous, I would LOVE to build a FSAE car!
Eric Hsu
Eric Hsulink
Wednesday, July 20, 2011 2:51 PM
I use WPC on all of my personal engines and the ones at work when budget allows. WPC is seriously the bomb. If you can afford it, you gotta use it.

Don't expect miracles, but WPC certainly helps. Keep in mind Mike's engine wasn't a 600whp, 9000rpm boosted screamer that would have probably tore a crank up without oil pressure even if god willed it.
Wednesday, July 20, 2011 7:13 PM
SixCylinders: We'll have some FSAE stuff for you soon, 8695Beaters put together a good look at their FSAE car :)
Thursday, July 21, 2011 9:26 AM
It's fun until you're up at 2 am hunting down wiring bugs, fixing engine mounts, and bolting in the seat and belts the night before the car gets shipped out. It's all worth it once you get to drive it for the first time. It's like giving birth if you went into labor the day you got knocked up.

Actually we have an old car we are probably going to sell. It's a nearly rolling chassis (full chassis and suspension without shocks. Will probably have a diff as well). Anyone interested? It's a tube frame so it's easy to work on. We'll scrap it if we can't get a buyer.
Thursday, July 21, 2011 10:03 AM
It would be nice know exactly what is possible to have WPC done on. I'm a noob about internal engine coatings and WPC type preperations, so a feature and comparisons would be cool (or maybe I missed an existing one).

Is there anywhere that a DLC coating would be superior to WPC, or would you just do WPC then DLC coat it? Can you get off the shelf hardware with existing coatings, such as Cosworth pistons, WPC treated?

Maybe a Special Treatment Part 2 :)
Thursday, July 21, 2011 2:16 PM
Some great testimony for WPC treatment!
Thursday, July 21, 2011 4:50 PM
amazing stuff. good question on the price though.
Mike Kojima
Mike Kojimalink
Sunday, July 24, 2011 7:59 PM
I think you guys need to go to WPC's websiit and look up the price for various things. Do you really think we have the time to do it for you?
Der Bruce
Der Brucelink
Sunday, July 24, 2011 8:13 PM
"I looked through the WPC site but to no avail :("

Mike, you should know I wouldn't bug you with questions when I could do the leg work. Okay, most of the time :) And after hearing how crazy busy you are on the intro to Motoiq radio, I know you don't have time for many of our "sillier" questions. BTW congrats this weekend! I tried to catch as much as could on the livestream. Dai looked great right out of the gate in qualifying!
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