WRX EJ20 vs STi Motor - Subaru WRX Forum
 
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post #1 of 5 Old 08-13-2003, 01:18 AM Thread Starter
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Question WRX EJ20 vs STi Motor

As far as hardware goes, what's the difference between my WRX motor and the STi motor. I know that they bumped the ccs to 2.5l, but did they increase bore or stroke or both? Also, what other things did they do? Different rods? Compression?

I know it has variable valve timing... so you don't have to include that!
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post #2 of 5 Old 08-13-2003, 08:12 AM
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Compression is slightly higher in the STi (I believe 8.5:1 as opposed to the WRX's 8:1). Bore and stroke are larger/longer. As far as internals, I believe the rods are the different because of the different crankshaft. And, naturally since it has larger bore, the pistons are different.
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post #3 of 5 Old 08-13-2003, 12:21 PM
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If I'm not mistaken I read that the block is different too. I'm not sure how. Anyway if you want a bigger motor for your Rex you could do a stroker kit and perhaps even an overbore. The stroker is good for 2.2L I believe and the overbore would add a little more. This is expensive work though.
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post #4 of 5 Old 08-14-2003, 12:36 AM Thread Starter
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Thanks for the replys. Not interested in punching out my motor, just had a friend ask what the difference was between my WRX and the STi...
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post #5 of 5 Old 08-15-2003, 05:15 PM
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Aluminum engine block and forged pistons and rods.
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