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Old 03-27-2009, 04:13 PM   #1
spazmoo
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Default What is an EJ20G?

What is an EJ20G and why is it so special. What are the pros and cons? What kind of block should I tell my friend to get? He doesn't have all the money in the world, but he is up a creek with a blown engine.

Thanks
Ben
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Old 03-27-2009, 07:47 PM   #2
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The EJ20G is the first incarnation of a turbo motor in Subaru's EJ motor line. It was first used in the '89-93 Legacy/Liberty. It was the top motor almost everywhere but in North America. It was then slightly revamped and used in the '93-'96 Impreza WRX/STI.

There is nothing "special" about them other than being the oldest, they are usually the cheapest. Some say they are the stoutest, but that is likely just because they were less high strung than later years.

EJ20Gs are easily identified because they have a cast 90 degree elbow on the inlet of the turbo (no pipe under the manifold).

You don't state what car your friend has, but if your friend has an '02+ WRX then he cannot use the EJ20G. Maybe the shortblock, but not the heads or intake manifold. There are sensor compatability issues.
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Old 03-27-2009, 09:41 PM   #3
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My friend has an 04 WRX. He asked me today to do some research on the EJ20G. He said he heard that it was stronger than his old engine. Do you think I should tell him to just get an STi engine?
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Old 03-28-2009, 12:57 AM   #4
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Quote:
Originally Posted by spazmoo View Post
My friend has an 04 WRX. He asked me today to do some research on the EJ20G. He said he heard that it was stronger than his old engine. Do you think I should tell him to just get an STi engine?
He could only use the shortblock, and even at that his compression ratio will not be ideal. The piston crowns and head gasket thickness have changed through the years.

In your friends case, I would look for an EJ257/EJ255 shortblock and an open source tune after installation.

If he really wants (or already has) an EJ20G, rebuilding the EJ20G with USDM WRX spec pistons (forged or not) would make an good motor, but not neccisarily any better than using an actual USDM WRX block.
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Old 03-28-2009, 05:57 AM   #5
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Quote:
Originally Posted by RallyColtTurbo View Post

If he really wants (or already has) an EJ20G, rebuilding the EJ20G with USDM WRX spec pistons (forged or not) would make an good motor, but not neccisarily any better than using an actual USDM WRX block.
Im not too sure about this, EJ20G had everything forged its close deck etc.. so using some wrx piston wouldnt really make this motor as good as it is..
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Old 03-28-2009, 11:03 AM   #6
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Originally Posted by jaimebenlasnow View Post
Im not too sure about this, EJ20G had everything forged its close deck etc.. so using some wrx piston wouldnt really make this motor as good as it is..
Not true, on several counts

Only really early Ej20G's(like 89-91) or STi's(up through 1995) were closed deck. 90% of them were not.

Only STi versions ever got forged pistons.

All Ej20's from 1989 until present have forged cranks and rods. There's really not one that's better than the other.

I personally wouldn't put an Ej20G block into an '04 WRX. For the money one would spend building an Ej20G to make it appropriate you can buy a brand new crate Ej25 bottom end.
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Old 03-28-2009, 12:00 AM   #7
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They are pretty tough bitches. I've got a number of friends with V1-2 WRX's that are making wicked numbers with the factory engine and are reliable DD that also see regular track time.

I intend to up the output on mine till it just blows up.
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Old 03-28-2009, 01:08 PM   #8
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http://www.rogerclarkmotorsport.co.u...productID=1036
EJ20 closed-deck block is one of the strongest Scooby starting points around and one of that was equipped with oil squirters to aid pistons cooling. Closed-deck blocks are the strongest blocks of Subaru and endure high boost and high horse power (700+hp). Heres a pic of a jdm ver7 ej207 and a ej20g.

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Old 04-04-2009, 02:26 PM   #9
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Quote:
Originally Posted by scby rex View Post
www.rogerclarkmotorsport.co.uk/shop_detail.asp?productID=1036
EJ20 closed-deck block is one of the strongest Scooby starting points around and one of that was equipped with oil squirters to aid pistons cooling. Closed-deck blocks are the strongest blocks of Subaru and endure high boost and high horse power (700+hp). Heres a pic of a jdm ver7 ej207 and a ej20g.

are you sure thats an ej207 on the left? that doesnt look anything like my motor and i have a jdm ver 7 sti limited.
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Old 03-28-2009, 10:35 PM   #10
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Did the EJ20G come in anything over here? It sounds to me like the only source of one would be overseas.
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Old 03-28-2009, 10:55 PM   #11
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Quote:
Originally Posted by spazmoo View Post
Did the EJ20G come in anything over here? It sounds to me like the only source of one would be overseas.
Correct. No EJ20Gs came to north America from the factory.
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Old 03-29-2009, 08:32 PM   #12
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Let's face it, it's really muddled.
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Old 03-29-2009, 11:11 PM   #13
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Quote:
Originally Posted by i_c_the_light View Post
Let's face it, it's really muddled.
^^This, I don't think even Subaru really has a firm grasp of which motor they put in which car, much less someone in the states buying front clips and tearing down motors.
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Old 03-30-2009, 03:01 AM   #14
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Quote:
Originally Posted by RealDealTarheel View Post
^^This, I don't think even Subaru really has a firm grasp of which motor they put in which car, much less someone in the states buying front clips and tearing down motors.
I'd say they decided much like the same way Japanese car manufacturers choose model names: throw random words into a vacuum cleaner and put it into reverse.
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Old 05-05-2009, 08:27 AM   #15
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Quote:
Originally Posted by Matt Monson View Post
Not true, on several counts

Only really early Ej20G's(like 89-91) or STi's(up through 1995) were closed deck. 90% of them were not.
Quote:
Originally Posted by RealDealTarheel View Post
So when my 94 WRX gets it's heads pulled for an HG change I will find an open deck block?
Quote:
Originally Posted by Cbgrandtheftauto View Post
Yes and yes...they are all the same as far as strength.
Quote:
Originally Posted by WRX_RA View Post
no and yes..
just pulled the heads off my 93 wrx and its a closed-deck block.
Quote:
Originally Posted by i_c_the_light View Post
I'd say they decided much like the same way Japanese car manufacturers choose model names: throw random words into a vacuum cleaner and put it into reverse.
Just to throw some water to a drowning man, here is the block out of my 94 WRX, plain jane WRX sedan. TD05H 16G turbo of course.

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Old 05-06-2009, 07:47 AM   #16
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The very first series of WRX's (build from November 1992 into somewhere in 1993) had the closed deck block, too
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Old 03-29-2009, 10:31 PM   #17
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why cant your friend do the search himself? if hes engine is fine stick with it until it dies... if he got the dough go for either an ej207 or ej257 build.
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Old 03-30-2009, 01:57 PM   #18
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Quote:
Originally Posted by Flat4TW View Post
why cant your friend do the search himself? if hes engine is fine stick with it until it dies... if he got the dough go for either an ej207 or ej257 build.
my friend doesn't have the patience to do the search, and i am always interested in doing a little bit of research. His oil line to his turbo was leaking and he ended up running out of oil. He says it runs real rough now and he already had hopes of putting a stronger engine in. I did a search initially for the EJ20G and didn't find much concerning why so many people liked it. All I found were mods and such.
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Old 03-31-2009, 02:54 PM   #19
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the way to find a closed or open deck blocks are to look down in front of the starter hump on the engine block and look for the casting lines with 2 little nubs sticking up the open deck ones are smooth!!!
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Old 03-31-2009, 03:43 PM   #20
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Quote:
Originally Posted by 94 GT View Post
the way to find a closed or open deck blocks are to look down in front of the starter hump on the engine block and look for the casting lines with 2 little nubs sticking up the open deck ones are smooth!!!
a picture would seriously help.
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Old 03-31-2009, 05:09 PM   #21
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Last edited by RallyColtTurbo; 03-31-2009 at 05:18 PM.
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Old 03-31-2009, 06:27 PM   #22
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Quote:
Originally Posted by RallyColtTurbo View Post
Another tell is the crosshatching you can barely see on the hollow "tube" where the head bolts run into the block, which is directly below where the black coolant line is bolted down in the foreground of the above picture.

Also, there are multiple casting molds of the closed deck blocks. I've seen them both with and without crosshatching on the mating line of the block halves directly above where the crank sensor bolts down.
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Old 04-04-2009, 07:10 PM   #23
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Quote:
Originally Posted by Matt Monson View Post
Another tell is the crosshatching you can barely see on the hollow "tube" where the head bolts run into the block, which is directly below where the black coolant line is bolted down in the foreground of the above picture.

Also, there are multiple casting molds of the closed deck blocks. I've seen them both with and without crosshatching on the mating line of the block halves directly above where the crank sensor bolts down.

The cross hatching on the front were the block halves meet! Are they STi or RA motors??? my Ej22 closed deck block did'nt have them but my STi Ej20G block has them! was that a way of denoting higher from lower performance Engines at the factory????
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Old 04-04-2009, 08:14 PM   #24
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Quote:
Originally Posted by 94 GT View Post
The cross hatching on the front were the block halves meet! Are they STi or RA motors??? my Ej22 closed deck block did'nt have them but my STi Ej20G block has them! was that a way of denoting higher from lower performance Engines at the factory????
The Ej22T's don't have it.

I've only ever seen it on 1995 STI Ej20G blocks. All of the ones I've seen earlier than 1995 that were closed deck didn't have it either.

Oil squirters have nothing to do with STi engines. In fact, Reddevil has even confirmed that he's found them on open deck Ej20H blocks.
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Old 04-04-2009, 09:21 PM   #25
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Quote:
Originally Posted by Matt Monson View Post
Oil squirters have nothing to do with STi engines. In fact, Reddevil has even confirmed that he's found them on open deck Ej20H blocks.
i have a EJ20H Block that has oil squirters...

it is nothing special...

-=Suberdave=-
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