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Old 03-16-2008, 01:01 AM   #1
Skoobie
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Default 2004 block build up, help please

I got an 04 WRX short block, and im thinking getting a .5 overbore, lighter pistons, lighter rods, and an STI crankshaft with cosworth bearings, I wont run more than 1.3 bars of boost, maybe daily driver, roughly 350 whp, i want a quick response, my concerns were:
1. Will the US STI crankshaft work, is it a straight swap?
2. Will the cosworth bearing hold up for everyday driving?
3. What size head gaskets should i get to get a 8.5 CR
4. Whats a good set of pistons? Im not familiar with the US brands.
5. Rods?

Any input will be helpful. Thanks in advance
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Last edited by Skoobie; 03-16-2008 at 01:07 AM.
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Old 03-16-2008, 02:17 PM   #2
BuggeyEYED
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wouldnt it be easier and alot cheaper to buy a built block from a refutable company and call it a day? looks like you are trying to make it into a strong sti block?
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Old 03-16-2008, 07:25 PM   #3
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Quote:
Originally Posted by BuggeyEYED View Post
wouldnt it be easier and alot cheaper to buy a built block from a refutable company and call it a day? looks like you are trying to make it into a strong sti block?
I wanna go that route at a later time, but for now, i would like to build it myself and have a sense of accomplishment with my car, and also to be able to take a step back and say "yeah, i did that". Im not exactly thinking of bragging rights, which is also a given but more of pride that i did it.
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Old 03-16-2008, 07:27 PM   #4
St.race
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Mahle pistons would raise compression to 8.5 plus they are very light.
Use OEM head gasket and in your case I would stay stock with rods and crank.
Bearings would not go bad from daily driving.
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Old 03-16-2008, 07:29 PM   #5
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Quote:
Originally Posted by Skoobie View Post
I wanna go that route at a later time, but for now, i would like to build it myself and have a sense of accomplishment with my car, and also to be able to take a step back and say "yeah, i did that". Im not exactly thinking of bragging rights, which is also a given but more of pride that i did it.
Best of Luck, St.Race
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Old 03-16-2008, 07:34 PM   #6
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Quote:
Originally Posted by St.race View Post
Mahle pistons would raise compression to 8.5 plus they are very light.
Use OEM head gasket and in your case I would stay stock with rods and crank.
Bearings would not go bad from daily driving.
i heard some negative things about mahle, like piston knocks. Is there a reason why i should stick to stock rods and crank? Im curious. I would also like to bump up the redline.
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Old 03-16-2008, 07:48 PM   #7
St.race
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Mahle pistons Knock? Bull S...
Why stock? You power goals are not that high.
Bump red line? why and how much?
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Old 03-16-2008, 08:09 PM   #8
Skoobie
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Quote:
Originally Posted by St.race View Post
Mahle pistons Knock? Bull S...
Why stock? You power goals are not that high.
Bump red line? why and how much?
thats what a few subaru guys were saying over here, like i said, im not familiar with US parts. I want a lighter load on the motor, and make more power, like a pieced together stroker. Redline up to 8000, im addicted to the sound and power up that high, my friend had a a STI Jspec when i was in Japan, man was it effin lovely.
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Old 03-18-2008, 02:02 AM   #9
Skoobie
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anyone?
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Old 03-18-2008, 12:04 PM   #10
R & H Garage
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Default

Quote:
Originally Posted by Skoobie View Post
I got an 04 WRX short block, and im thinking getting a .5 overbore, lighter pistons, lighter rods, and an STI crankshaft with cosworth bearings, I wont run more than 1.3 bars of boost, maybe daily driver, roughly 350 whp, i want a quick response, my concerns were:
1. Will the US STI crankshaft work, is it a straight swap?
2. Will the cosworth bearing hold up for everyday driving?
3. What size head gaskets should i get to get a 8.5 CR
4. Whats a good set of pistons? Im not familiar with the US brands.
5. Rods?

Any input will be helpful. Thanks in advance

1. The US STi crankshaft will work with custom pistons. No it is not a straight swap without getting the right pistons. These pistons are not usually found on anyone's shelf. You are talking about a 2.2L stroker like the one I sell and Ron (RAW Performance) sells.
2. Cosworth Bearings are ACL bearings. ACL bearings are a bit cheaper if you find a good dealer.
3. This question is silly. It totally depends on the stroke, bore and piston used.
4. There are many good sets of pistons. It is all about what you desire and your budget. To get the 2.2L you are describing, I would go with CP. However, these pistons are noisy as hell when set at .0035" piston to wall clearance that they call for. You probably wouldn't like them for a daily driver. Look at the Unabombers Piston FAQ for a few tips.
5. Rods, factory US STi rods are the same length as your factory WRX rods only much stronger. If you want high RPM capability, I would recommend getting ahold of a set.

Lastly, I would highly recommend doing a lot of homework and getting a someone to help you. This isn't something you do yourself just for pride. That's retarded.

As I always put it:
Do the shortblock right the first time. "It is the furthest thing from a wrench."

-Dominic
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Old 03-19-2008, 10:14 AM   #11
BuggeyEYED
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i have mahle pistons in mine...only have a few thousand miles and a minor tune for now and no signs of knocking.
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Old 03-22-2008, 01:51 AM   #12
Skoobie
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Quote:
Originally Posted by KitoAutoSport View Post
1. The US STi crankshaft will work with custom pistons. No it is not a straight swap without getting the right pistons. These pistons are not usually found on anyone's shelf. You are talking about a 2.2L stroker like the one I sell and Ron (RAW Performance) sells.

-Dominic
Why isnt it a straight swap, is it because the stroke distance, and the piston height wont clear?
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