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Old 11-08-2004, 11:19 AM   #1
Astacun1
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Default broken engine time for an upgrade

Hi guys. I need some sugestions. Recently my 2002 stg 2 wrx was behaving strangely and started making a very disturbing noise. It turns out that I had recently hit a bump and the oil filter had a small crack and my car was loosing oil. To make the long story short, I may need an engine rebuild. I am planning on upgrading to a USDM 2.5 Sti shortblock and drop in a set of forged pistons while I am at it. I am also going to get the Sti Ra gearset. I still have the factory turbo so I am going to upgrade the turbo as well. Here is where I need your help guys. I know that this has been discussed extensively, but I am still not sure which way to go. This will be my daily driver. I want 320-350 whp on 93 oct, with the capability to reach 400 whp on 93 oct with all the supporting mods as a Long Term goal. Should I get a Superzilla, an FP Green or should I get a more expensive Garret turbo? Should I save for a custom setup or can I reach my goal with a bolt on turbo. Internal WG or External WG? Sorry for the long post. Thanks in advance.

Astacun1
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Old 08-02-2005, 12:56 AM   #2
ebeck
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Can you fill us in on your CP 2.5 adventure?
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Old 08-02-2005, 02:39 AM   #3
jigga
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seems everyone is trying to upgrade at the moment! I too am thinking about starting to build something up that will make a good amount of power, AND last as well too... Seems that a few members don't recommend dropping CP pistons into an ej257 or something to that effect. Something about excessive oil burning and odd noises on warm up. Perhaps Ebeck can chime, as he appears to be very knowlegable as well with these engines.. On the other hand, there is the option of the ej207, but they seem hard to come by these days..

I was thinking of picking up an ej207 v7 shortblock to start my quest off and sititing on it, then heads later, and collecting everything slowly but surely, but RA Spec C head setup seems particularly tasty but unattainable....
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Old 08-02-2005, 03:03 AM   #4
ebeck
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I like the 2.0 with Mahle pistons. CP or other piston would work quite well too. I have an issue with the bottom oil ring and the pin access port in the cylinder with forged pistond and the 2.5. The aftermarket piston ring pack is lower than OEM exposing the oil ring to access port breaking the oil seal. Some motors suck up oil and burn it. Some run fine with no issue. The long rod would certianly help this. Some have problems some do not.

I hate gambeling or spending money for a solution, which is actually not a solution, but rather beta testing or bank rolling vendors R&D. That is how I see it right or wrong. If I bought a motor and it smoked and blew oil I would want a refund. But it is a racing motor now sooooo, "No soup for you!" Plus all teh money to break it down again and build up again.

It is that way with almost any motor for any make from any builder actually. Nothing new here. I would buy a 2.0 CP motor from Crawford or Axis in a heart beat but neither do 2.0 work hardly and Crawford not al all. It is not about the builders it is about the pistons not being what I want right ot wrong.

The piston thing will get better especially as Subaru gets better at making blocks and vendors resolve issues. In fact, I hear Crawford has new piston design now. If so, there is an example at work. Things are getting better all the time. Currently, my new block has one piston larger than the other 3. From the factory. The JDM motors..... pistons are all the same all the time. There is no A and B bore. Mike at KingPin had one of the first drop in CP piston motors and the motor fills the dyno room with smoke. Slaps like a deisel motor too.

So, I got a new 2.5. I am going to cryo treat the OEM 2.5 pistons(super cheap to do, why not) and have them swain coated on the tops and moly coated on the sides. Then have my rods and pistons actually balanced, check over the crank for balance and put then put back in. The goal is stock running motor, stock parts with better balance and more restance against wear and heat.

So many guys in the 2.5 forum are getting jaded with power and want 500whp. I am a pump gas guy and 350-380 is all I want. I am happy now actually with 330ish and my 2.0 actually. Quite in fact, but I may have a bearing issue. We'll see next UOA.

We'll see how it works. I figured I'd try a different build path as I am quite daft and never learned how to follow a crowd. My mom never let me have friends so I never learned group behavior or etiquette. I am the "glass is half empty" guy and the "why not" guy. Despite the other kids on the playground laughing at me.

Last edited by ebeck; 08-02-2005 at 03:26 AM.
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Old 08-02-2005, 07:32 AM   #5
Astacun1
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Hi,

The shortblock swap was done. I used a set of cp 8.0:1 forged pistons. I also have modified stock injectors, utec, fmic, big maf intake, gt spec headers and a gt30r. I am having a problems. When the engine was started there was blue smoke on the exhaust, so I guess the engine is burning oil. The engine was dissasembled again because there was a confusion with the piston rings. We had to order a set of cp piston rings because the 8.0:1 forged piston needs a different model of rings, not the oem sti rings. The engine was started again and although the blue smoke has reduced it is still there. It starts burning oil after the engine warms up. It does not burn oil when cold. I checked the intercooler piping and the turbine pipes and they are clean and dry, with no oil. I also removed the headers and started the engine with the car on a lift and I can see little drops of oil coming out of the exhaust ports of 3 cylinders. A compression test was performed with excellent results on all 4 cylinders. All of the gaskets were installed new and the heads were sent to a specialist for inspection prior to installation. They said there was minor damage to the heads and they did some work on them to fix it. The rest was ok, no bent valves, etc. The shortblock and the pistons are brand new. I really dont know what is causing the problem. My guess is the heads are damaged and the so called specialist did not notice it. I spoke with ebeck and he gave me a lot of info. If anyone else wants to chime in I will really appreciate it. Thanks in advance.
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Old 08-03-2005, 02:43 AM   #6
ebeck
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Bump...
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Old 08-03-2005, 03:26 AM   #7
Anub1s
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Check your heads for any possible leaks. It may not be the internals of the block, could be valve guide seals.
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Old 08-21-2005, 10:55 AM   #8
Astacun1
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The heads were checked one more time and there are no leaks. Compression is fine. Still seeing blue smoke during deceleration. Intercooler piping is dry and spark plugs are dry. Any ideas?
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Old 08-21-2005, 01:44 PM   #9
jigga
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not sure if I have any.. I do remember a thread posted a while back where someone with a 2.5 with the CP pistons dropped right in had issues with smoking and oil burning..
The only other thing i know is that they can have a tendency to sound like a diesel at startup
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Old 08-22-2005, 03:29 AM   #10
2ndGearFling
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Have fun with heat transfer issues on the forged pistons.
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