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Old 04-03-2007, 12:31 AM   #1
Gruppe-S
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Default 2006 290HP EJ20 Dual AVCS - Mini autopsy :)

Hey guys,

I'm sure some of you guys have seen this engine before. Others of you may not have so I thought I would share for those who are interested.

This motor is pulled from the limited edition JDM Legacy GT B4



It's rated at 287HP in 2.0 liter format.



1. Right off the bat you'll notice that this is a dual AVCS engine with AVCS sprockets on both the intake and exhaust side.



2. You'll also notice that the head casting looks surprisingly similar to the USDM 06 STI, but with the exhaust side AVCS components.



3. After taking the valve covers off I was surprised to find instead of the JDM STI 2.0 chilled cast cams, cams that use the USDM 2.5 STI base cores. The lobes have less lift than the STI or WRX cams, but more duration. They are also WAY lighter than the chilled cast WRX / JDM 2.0 STI units.



4. The head casting is very very similar to the USDM STI 2.5 heads. And Of course shimless buckets.



5. Finally I was really expecting to see a semi-closed decked, and rather dissapointed when I didn't. At least forged pistons and forged rods were present. I'll get a pic of the crankshaft later - it is similar to the JDM 2.0 STI unit. On the left is the OEM 2.0 WRX cast piston.



Thanks for looking

Gary
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Old 04-03-2007, 12:39 AM   #2
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i want it
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Old 04-03-2007, 12:46 AM   #3
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Yeah, you can donate that to me if you'd like.
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Old 04-03-2007, 01:14 AM   #4
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nice motor. what is this going in?
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Old 04-03-2007, 01:28 AM   #5
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nice motor. what is this going in?
Hehe no candidates right now - had a bad intake valve so we're redoing the heads. It is basically a good candidate for 2.0 cars looking for a beefed up high revving 2.0.

Thanks,

Gary
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Old 04-03-2007, 01:38 AM   #6
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Interesting setup. Is it possible to tune the intake and exhaust side now?
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Old 04-03-2007, 09:27 AM   #7
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It looks like it has 100 miles on it... how could an intake valve be bad already?
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Old 04-03-2007, 03:01 PM   #8
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Does the open deck design severely limit the power potential of this engine? I know high boost wouldn't be desired in the open deck but what about peak power?
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Old 04-03-2007, 04:14 PM   #9
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Doctornick - I don't know of any aftermarket ECU's that can accomodate both.

Controler - usually intake valves fail from valve float / high revs, although I didn't see any impact on the pistons, so maybe just a bad valve guide?

Coolrex - I would say that the open deck design does limit the top end capability of this motor, but short of 2 bar + I don't think there will be any serious problems with the open deck design. One has to keep in mind that "semi closed" on a Subaru engine is merely just a small piece of aluminum no deeper than 0.5".

Thanks,

Gary
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Old 04-03-2007, 04:21 PM   #10
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Hmm how much would a swap donor of this motor plus it's ECU run?
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Old 04-03-2007, 04:52 PM   #11
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Do JDM Suby ECU's talk OBD2? I know honda ECU's don't.
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Old 04-03-2007, 05:22 PM   #12
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Quote:
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Interesting setup. Is it possible to tune the intake and exhaust side now?

EcuTeK has the most advanced JDM OEM ECM tuning, if anyone can do i would imagine it's them.
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Old 04-05-2007, 11:35 AM   #13
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Gary, what is the engine code?
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Old 04-05-2007, 08:06 PM   #14
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Gary, what is the engine code?
EJ20R, but dont quote me.
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Old 04-05-2007, 10:46 PM   #15
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oh wow, will you get more? how much?
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Old 04-06-2007, 04:55 PM   #16
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Have no clue what the engine code is, sorry.

We have this one engine available, it's in great condition except the #1 intake valve is leaking a bit, either from debris getting in or maybe a valve guide. We're letting this go for real cheap (please see our vendor section) so it would be worthwhile for someone to rebuild it if they had the time. Keep in mind most JDM 2.0 forged engines go for over $3k.

Thanks,

Gary
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Old 04-06-2007, 05:25 PM   #17
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u have the ECU for this also?
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Old 04-06-2007, 10:13 PM   #18
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Quote:
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Have no clue what the engine code is, sorry.

Thanks,

Gary
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Isn't the code on the white sticker on the timing belt/cam cover? I will try and contact someone over in Japan to see if I can find out what it is.
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Old 04-07-2007, 09:51 AM   #19
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what makes you so sure they're forged pistons?

i have a v.8 EJ207 Spec C shortblock, and my pistons look nearly identical to those (assuming they're stock pistons), and AFAIK, they're "hypercast" or something like that (stronger than USDM pistons, but not quite @ the forged level)
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Old 04-10-2007, 04:14 PM   #20
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Bump for answers to my question and Jasper's.
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Old 04-12-2007, 09:48 AM   #21
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Bumperooski.
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Old 04-12-2007, 05:34 PM   #22
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Jasper - I'm fairly certain they are forged units (or an incredibly good cast) as close up they look nothing like the casting on the WRX or STI units.

WRXFactor - Didn't we send you one of these engines?

Thanks,

Gary
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Old 04-12-2007, 05:58 PM   #23
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is there any well to tell for certain. if i have forged pistons, 28psi might not be such a bad idea
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Old 04-13-2007, 09:58 AM   #24
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I don't believe so. Is the sticker still on the cam cover?
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Old 04-13-2007, 05:08 PM   #25
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I don't believe so. Is the sticker still on the cam cover?
Hmm ok sorry about that. No the sticker is smudged on the cam cover. I believe it's an EJ208 but I could be wrong.

Thanks,

Gary
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