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Old 05-26-2005, 12:00 PM   #1
keirnna
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Default EJ20 engine differences

I did a seach and I can't find what I am looking for. Your assitance would be greatly appriciated. I am wondering what the difference between all of the STI EJ series engines are. I want to do a swap, and I want a closed deck EJ20, but it seems they are very rare. So I am trying to find what the difference is between the EJ20k, EJ20g, EJ207, etc...
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Old 05-26-2005, 12:12 PM   #2
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search in the conversions forum. It is all there. But only early STi's through '95 will have a closed deck...
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Old 05-26-2005, 12:30 PM   #3
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According to ravensblade the type RA had a closed deck after 95. I did a ton of searching. I'll check out the conversions forum, but if you have a link hook me up.
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Old 05-26-2005, 04:43 PM   #4
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Here is a link

http://sti.catherineandken.com/

Hope it helps
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Old 05-26-2005, 05:24 PM   #5
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Thanks.
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Old 05-26-2005, 05:32 PM   #6
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This is some decent information, but it seems that Subaru does it's normal thing to sell 5,000 variations in the same shell:

http://www.catherineandken.co.uk/sti/engine.html
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Old 05-29-2005, 04:10 AM   #7
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Quote:
Originally Posted by keirnna
This is some decent information, but it seems that Subaru does it's normal thing to sell 5,000 variations in the same shell:

http://www.catherineandken.co.uk/sti/engine.html
the chart is incorrect; for the sti version 5 and 6, the engine code is a ej207, which is a semi-closed block
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Old 05-29-2005, 10:12 AM   #8
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Really, so do you have a link for the with that information? I am just trying to find which swap I want to get.
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Old 06-02-2005, 11:54 AM   #9
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Default Engine types

Here is a site with some info for JDM engines if that helps.

grahamberry2.co.jp/impreza_gc8/
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Old 06-02-2005, 01:03 PM   #10
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v5 and v6 aren open deck
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Old 06-02-2005, 05:33 PM   #11
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Thanks, the EJ207 (V7 STi block) is semi closed right?
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Old 06-02-2005, 11:18 PM   #12
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correct
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Old 06-02-2005, 11:24 PM   #13
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Okay thanks. So the EJ207 has been used in V6+ STi's according to that article right?
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Old 06-03-2005, 12:29 AM   #14
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I thought 22b's were closed deck turbo legacy blocks
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Old 06-03-2005, 12:59 AM   #15
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They are not turbo legacy blocks. Both the turbo legacy and 22b have 2.2 litre closed deck blocks; however the 22b doesn't have oil squirters and the turbo legacy block does. That is the only difference as far as I know. I think bore and stroke are the same.
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Old 06-03-2005, 03:18 PM   #16
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The Ej20G found in the 22B is also a phase II engine with the thrust bearing end mounted and not centered like the EJ22T. Has forged pistons as well. The Ej22T has moly coated cast pistons...

Regardless, closed deck vs open deck vs semiclosed deck is pretty meaningless...
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Old 06-03-2005, 03:37 PM   #17
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Quote:
Originally Posted by Matt Monson
Regardless, closed deck vs open deck vs semiclosed deck is pretty meaningless...
Please explain further Matt.
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Old 06-03-2005, 07:06 PM   #18
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Closed Deck vs Open Deck was a major issue about 5 years ago before the WRX hit. Mike Shield's of SPD wrote a treatise on why his company would not develop a turbo kit for the EJ25, and a large part of it was the open deck design. This set the stage for a long series of debates about it, and basically gave the open deck a bad name.

But it is apples and oranges to compare the old EJ25 with the EJ20 open decks. One major thing is the bore size. The smaller bore of the EJ20 is far less likely to flex. The other part of it is the bottom end and crank girdles. The EJ20 was designed as a turbo engine that was going to see significantly higher stress than the EJ25.

Now, if you are really going for broke in the power department, a semi-closed or closed deck engine would be a good option. But for 400-450chp, it really is a non-issue. On an Ej20, rods an other things are going to be the weak link before the deck is an issue. And even then I have seen semiclosed deck engines blow cylinder walls! As in a 3 inch long split in the cylinder.

If you are swapping for a swap, and are going to run it near stock or slightly tuned, open deck is fine. IMO, the '97-98 JDM WRX engines are great choices, and pretty easy to find. The heads flow great, and they are really solid engines. They are EJ20K's that are stronger than the EJ20G open deck engines that continued in the world market. If you do a search for Mike's old article (it also may still appear on the SPD site) he goes into some of the differences in spec on the engines as they evolved. Actually, for WRX tech, SPD's site is a great resource...
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Old 06-03-2005, 08:50 PM   #19
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Yeah lightly tuned and my cars don't go in the same sentence. Thanks for clarifying what you meant.
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Old 06-04-2005, 10:38 PM   #20
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I think most people don't understand the REAL reason for the different deck styles. Subaru started closing the deck on all engines with the EA71 I believe. This was to combat headgasket issues. Up until the EJ series all engines were closed deck. But with the newer style of engine it wasn't needed on NA engines. They stuck with it on the turbo engines for a while though. Why they stopped doing it is up for grabs. Could be that even the EJ20G/EJ22T didn't need to be closed deck to begin with, and some EJ20G's weren't, but who knows what changed between the open and closed deck versions. Or it could be that with the EJ20H and EJ20K they could manufacture engines that wouldn't blow the HG's. As I said, I don't know for certain.
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Old 06-05-2005, 03:21 AM   #21
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I was led to believe the change from closed deck to open deck Ej20 was a side effect of WRC regulations. Prior to the rule of engines having orifice plates the EJ20 blocks were cast to be able to handle high hp. However an engine fitted with the orifice plate had a hp limit of about 350hp.
Basically subaru was wasting money casting fully closed deck blocks and changed to open deck designs in order to save manufacturing costs the open deck design was easily able to handle the new 350hp limits.
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Old 06-05-2005, 08:16 AM   #22
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Edited for misreading Matts post!!

Last edited by DuoMaxwell; 06-05-2005 at 04:37 PM.
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Old 06-05-2005, 12:25 PM   #23
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Did you really read what he said or did you just pick certain words out and post a reply?
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Old 06-05-2005, 05:13 PM   #24
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Quote:
The Ej20G found in the 22B is also a phase II engine with the thrust bearing end mounted and not centered like the EJ22T
you mean ej20K right
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Old 06-06-2005, 12:16 PM   #25
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Quote:
Originally Posted by Jaxx
you mean ej20K right
Nope. While the engines of that era were EJ20K's, the 22B is most definitely known as an Ej22G. Every technical document I have ever seen on it says so...
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