Displacement and Internals for a EJ205 Rebuild - Subaru WRX Forum
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#1 Old 05-22-2013, 06:12 PM
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Displacement and Internals for a EJ205 Rebuild

When I eventually rebuild my WRX 2.0L twin-cam turbo for Stage 2 power levels, what general approach do you suggest?

1. Performance shop familiar with Subaru performance engines,
2. Oversized (o/s) forged pistons, and
3. Internal oil control measures (baffle & windage tray, pan design).

Is there an appreciable displacement increase with o/s pistons?
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#2 Old 05-22-2013, 07:49 PM
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#3 Old 05-22-2013, 07:50 PM
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Basic stock shortblock for that power level. You don't need anything fancy for the simple bolt ons that are needed for a stg. 2, then again it really depends on what you intended to do with the car.
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#4 Old 05-22-2013, 09:01 PM
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Quote:
Originally Posted by psinuse View Post
Basic stock shortblock for that power level. You don't need anything fancy for the simple bolt ons that are needed for a stg. 2, then again it really depends on what you intended to do with the car.
I'm thinking about modest improvements in a balanced way for the WRX. I do Nav rallies, a few Autocross and other Lapping day events, all for fun. Maybe 7-10 various events per season. This year I've signed up for the Time Attack School at Mosport, as an example.

It'll continue to be my daily driver, but I have the good fortune of walking to work.

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#5 Old 05-22-2013, 09:17 PM
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I'm thinking about modest improvements in a balanced way for the WRX. I do Nav rallies, a few Autocross and other Lapping day events, all for fun. Maybe 7-10 various events per season. This year I've signed up for the Time Attack School at Mosport, as an example.

It'll continue to be my daily driver, but I have the good fortune of walking to work.
Stock shortblock would be my suggestion. I drag raced, road coursed and rallied my car, plus a daily driver for almost 10 years, other than my own mistake it would probably still be on the original motor.
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#6 Old 05-22-2013, 09:49 PM
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Would I have the cylinders bored .020 over and leave the rod and main bearing sizes standard?

Rebuild kits look like they come with pistons, and I'd want to remove the typical tapered wear at the top of the cylinders.
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#7 Old 05-23-2013, 05:16 AM
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Usually those pistons are stock cast pistons. To rid of the taper you'd need to have the block bored and honed...of course that is dependent on how out of round the cylinders are. Talk to a machinist about the block though and be prepared to pay big money for it as well.

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#8 Old 05-23-2013, 12:21 PM
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To rid of the taper you'd need to have the block bored and honed...of course that is dependent on how out of round the cylinders are. Talk to a machinist about the block though and be prepared to pay big money for it as well.
I would have assumed a bore and hone was standard on a rebuild, along with oversized pistons to match. Is this not typical of most rebuilds?

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#9 Old 05-23-2013, 12:23 PM
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Originally Posted by psinuse View Post
Usually those pistons are stock cast pistons.
Is there any value specifying forged pistons in the rebuild kit, if stock connecting rods are sufficient, or are these 2 upgrades usually paired?

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