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Old 11-22-2011, 11:43 PM   #1
1hotsubaru
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Location: Harrisonburg, VA
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2002 WRB Impreza WRX
2.1 Stroker w/ VF39

Default ej20g motor with USDM WRX transmission??

Hey guys, got a quick question. I know that I can fit the older EJ20G motor into my transmission, but what would I need to make it work properly?? Since I will be using my transmission, I wouldn't need a new clutch assembly, rear differential, master slave cylinder, etc. right? Glad if someone could give me some insight.
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Old 11-23-2011, 01:16 AM   #2
DHRDAN
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....sigh... tranny always follows the rear.


If you're just changing the engine.... the rest will fit.


Subaru didn't change clutch types till the v8. ... so you're fine.
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Old 11-23-2011, 08:34 AM   #3
1hotsubaru
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Really? That's probably the route I'll go then. I know some people say that the long block won't fit because the 02 wrx intake manifold doesnt work with the ej20g, but that's why I just want to get a motor with the wiring harness. Anyone else got some insight?
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Old 11-23-2011, 12:12 PM   #4
RallyColtTurbo
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There will be a missing bolt hole on the motor for the second starter bolt.

Early tranmissions had stud on the trans and no hole on the motor.

Later transmissions used a long bolt through the bellhousing and a matching threaded hole on the block. So some fabrication will be involved....a search should turn up what others have done.

Not quite sure of your plan, but USDM WRX wiring and ECU will not control an early EJ20G. You should be able swap the cylinder heads and intake manifold and the crank sensor to the older motor. Basically just use the shortblock, but double check compression ratios and head gasket thickness to be sure.
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Old 11-24-2011, 04:13 PM   #5
Jaxx
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you do know that a 02 ecu will NOT run an ej20G right?
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Old 11-28-2011, 10:17 AM   #6
1hotsubaru
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Quote:
Originally Posted by RallyColtTurbo View Post
There will be a missing bolt hole on the motor for the second starter bolt.

Early tranmissions had stud on the trans and no hole on the motor.

Later transmissions used a long bolt through the bellhousing and a matching threaded hole on the block. So some fabrication will be involved....a search should turn up what others have done.

Not quite sure of your plan, but USDM WRX wiring and ECU will not control an early EJ20G. You should be able swap the cylinder heads and intake manifold and the crank sensor to the older motor. Basically just use the shortblock, but double check compression ratios and head gasket thickness to be sure.
Ok, that blows... I won't be able to fabricate anything for now, so I won't be able to go that route. I do like the idea of just using the ej20g block, but we'll see. Thanks!

Quote:
Originally Posted by Jaxx View Post
you do know that a 02 ecu will NOT run an ej20G right?
Yes I'm aware of this. The engine I was looking at did come with an ECU. I think I'm just going to stay USDM for now.
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