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Old 11-08-2011, 05:13 PM   #1
Speedwagon
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Join Date: Jun 2002
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Location: Denver, CO
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1998 Legacy Wagon GT
Green

Default EJ20 block in place of EJ25?

'98 Legacy GT, 2.5 NA. I have an EJ20 turbo engine sitting around, that I've been meaning to get into the Legacy. However, I recently had a problem with the EJ25, and I have a broken bolt in the block, resulting in a coolant leak.

Can I use the EJ20 as a bandaid replacement for the EJ25, without doing the wiring and such? Just using the EJ20 block and heads, direct replacement for the EJ25 for the time being? I know I won't have crap for power on a low compression engine, but I don't have the time to dedicate to the wiring just yet, for the full turbo swap.
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Old 11-08-2011, 05:16 PM   #2
Matt Monson
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The crank and cam trigger points are different and not compatible with your ECU.
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Old 11-08-2011, 05:23 PM   #3
Speedwagon
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It just occurred to me, based on that statement, that I didn't mention what EJ20 I have. It is a '91 JDM EJ20. Don't know if that changes anything, but I thought I should specify. Both are DOHC.
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Old 11-08-2011, 06:41 PM   #4
Matt Monson
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That does change things. Not only will it drop right in and run on your sensors, but you can bolt your complete intake manifold to it and keep your wiring and manifold harness.

ps. That Ej20 might be a closed deck block too boot.
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Old 11-08-2011, 06:42 PM   #5
Matt Monson
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oh, and be sure to cap the turbo plumbing on the passenger side head. Wouldn't want coolant or oil spitting out all over the place...
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Old 11-08-2011, 06:44 PM   #6
Speedwagon
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It is closed deck. And good call on the coolant & oil lines there, I might have forgotten!
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Old 11-10-2011, 04:43 PM   #7
smilie127
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Default 2003 impreza outback sport

Im new to this site, just bought an '03 impreza outback sport with a blown motor for $750. I just want to get a newer block and use the heads I have on this engine. Any idea what year engine blocks are compatible with my heads and car??
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Old 11-11-2011, 02:49 PM   #8
Matt Monson
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Quote:
Originally Posted by smilie127 View Post
Im new to this site, just bought an '03 impreza outback sport with a blown motor for $750. I just want to get a newer block and use the heads I have on this engine. Any idea what year engine blocks are compatible with my heads and car??
Welcome.

Step 1: Learn to use the search button and spend a lot of time reading.

Step 2: If you can't find what you need, don't pollute someone else's thread with a totally and completely unrelated question. Start your own thread if you need answers. There's nothing even vaguely the same between a late 90's Legacy and your '03 Impreza. Anything we've told him is meaningless for your car.
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Old 03-21-2012, 12:17 AM   #9
Speedwagon
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Quote:
Originally Posted by Matt Monson View Post
oh, and be sure to cap the turbo plumbing on the passenger side head. Wouldn't want coolant or oil spitting out all over the place...
On this point... I'm in the process of doing this right now. Is there any downside to plugging that oil passage? Will it affect pressure or anything if it is capped off?
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Old 03-21-2012, 12:55 PM   #10
Matt Monson
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Not any that I can think of. It's not a terribly high pressure feed to start with. I can't see it causing your oil pressure to spike or anything like that. Ej25D heads are pretty much the same thing as Ej20G heads and lots of guys have converted them over to turbo application by opening up that passage. I don't see why going the other way would be an issue. And I've run a 10mm turbo oil pump on my Ej251 (which comes stock with a 9mm) for years without a problem. I don't see it making any difference capping that.
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Old 03-26-2012, 11:00 AM   #11
Speedwagon
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Awesome, thanks. I went ahead and did this... only to find some cylinder is not firing properly. Now I have to dig deeper and find the problem. Seems like it has to be mechanical, since the problem wasn't there prior to swapping the EJ20 in.
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