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Old 11-27-2001, 06:22 PM   #1
Scooby Newbie
Member#: 12128
Join Date: Nov 2001
Location: Orlando, FL
2002 Imreza WRX

Default Are the 2.5 RS and WRX the same Motor?

I was just wondering if the WRX is just the 2.5 RS motor, with sleaves in it bring it down to 2.0 and lower compression pistons?

Or, are they 2 competely different motors?

I saw that they have some big bore kits for the WRX that can bring it up to 2.5.....so I was just wondering???

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Old 11-27-2001, 06:50 PM   #2
Scooby Specialist
Member#: 3805
Join Date: Jan 2001
Chapter/Region: International
Location: Paris, FR / Houston, TX
2011 STi Sedan SWP
2011 Outback ABP


The EJ20 and EJ25 are different motors, but very similar design.
AFAIK the EJ20 was designed with turbo applications in mind and as such has stronger cylinder walls, etc. than the stock EJ25.
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Old 11-28-2001, 04:07 AM   #3
Scooby Newbie
Member#: 3409
Join Date: Jan 2001
Chapter/Region: NWIC
Location: Oly
98 My FMIC
Is bigger than yours.


Interesting. I haven't seen any of the big bore kits for the WRX. I have seen a stroker kit that ups it to 2.2L though.

Yeah, they're completely different motors.
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Old 11-28-2001, 05:37 PM   #4
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Member#: 5692
Join Date: Apr 2001
Chapter/Region: Tri-State
Location: Lovely Florida, NY
WTF? YES! I am
better than you!


EJ20 is 2.0 liter DOHC 8:1 Compression.

EJ25 is 2.5 liter SOHC 10.2:1 Compression.

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