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Old 03-07-2006, 09:40 PM   #1
*subaru or nothing*
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Default 1.8L to a 2.5L?

I have a 96 Impreza with a 1.8L. I am looking to upgrade my engine to something bigger, better, and more powerful. My boss has a 96 Legacy with the 2.5L GT. He is buying a new sti engine for his car and told me he would give his old engine to me. It does need to be rebuilt but i dont mind doing that when the engine is free. the only thing i am concerned about is how difficult of a swap would it be? If their is going to be a lot of fabricating, and modifying then I am just going to get a 2.2L and make my life a little bit easier. But I would really prefer to be able to put the 2.5L in it. If anyone has any knowledge or advice concerning this it would be greatly appreciated.

David
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Old 03-07-2006, 10:42 PM   #2
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Put in the 2.2 with a 2.5 shortblock... (there are some threads about it here)
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Old 03-08-2006, 09:15 AM   #3
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drop the whole thing in. I've done it three times in two different cars. It's simple.

NO you won't have to fab much, if anything.
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Old 03-09-2006, 09:32 PM   #4
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Don't bother with a 10 year old engine. Get a newer one like '00 or '01... they sell all the time for a couple hundred bucks. You're going to spend more than that rebuilding the '96.
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Old 03-10-2006, 07:31 PM   #5
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The only thing I would use off of his motor is the short block, slap some 2.2 heads on it and use your 1.8 intake everything will plug right up. That short block has a knock sensor next to the bell housing that the 1.8 doesn't but you can just leave that unplugged without a problem. I did this last night in my 93 imp with a 2.5 short block out of a 97 outback that only had 13,000miles on it, easy swap and I can get rubber in 2nd due to the 2wd 5spd.

All of your brackets will mount onto the 2.5 short block they are identical.
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Old 03-10-2006, 07:40 PM   #6
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I would try using a 2.2
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Old 03-11-2006, 01:33 AM   #7
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i'd rather not have to buy two engines to use the 2.5 block with the 2.2 heads and i dont mind having to rebuild the 2.5 i mite be getting because it will most likely be free. but i do appreciate all the advice. will the wiring harness on my 1.8 still be usable or do i need to get a harness for a 2.5?
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Old 03-11-2006, 10:51 AM   #8
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the same model year engine and same year chassis should be plug n play for harness installation. just use the sensors it needs(if diff. than 1.8) and you'll be fine. you'll need the 2.5 motor harness not the whole vehicle harness.
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Old 03-11-2006, 03:30 PM   #9
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You may or may not need the harness. Never know until you inspect both. Most of time you're just needing a couple of different connectors, as was the case with the swaps I've done.
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Old 03-11-2006, 04:03 PM   #10
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Listen to Streetman. He's steering you right. I only advocate the Ej22/Ej25 hybrid high compression frankenstein for guys who got Ej22's in their car to start with, or just have the parts laying around. As Streetman is telling you , it will be a very basic swap to get Ej25 into your car, and you will even be able to keep the EGR (Weee!).

My only "concern" would be the condition of the DOHC Ej25. You say it needs a going through. That's going to run you around $1000 in parts if we are talking from the bottom up with all bearings, rings, etc. etc. For that kind of money, if you shop smart you can find a good used one. Personally, I would really only bother if I was doing a built motor and was going to add cams and high CR pistons, etc. during the process. Then you are in the $4000-5000 range. Core engines are cheap and worthless. It's the rebuild parts that cost real money...

In light of that, if the Ej25 has something simple like a bad head gasket, do the minor repair and throw it in. Keep your Ej18 on the side in case you crater the Ej25, and drive the piss out of it!
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Old 03-11-2006, 04:39 PM   #11
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Well, as for the price of rebuilding i am not too worried about that because i work in an auto parts store so i get parts at extremely good prices and i also have a very close family friend who owns a mechanics shop and i know many other people who own shops. so i dont think money will be the problem.for the most part i will keep it stock,i will bore it a little bit and try to get a aftermarket camshaft and things like that, but i am not going all out on this engine, as i do not need a whole lot more power in that little car, but if i was to buy a 2.2 i would try to get as much power as possible out of it to try to match a 2.5.
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Old 03-12-2006, 11:16 PM   #12
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It can be really cheap to do, with mine I used a 2.5 that had bent the valves (10,000 miles on the short block 8-) and the 2.2's had a bad problem with spreading the keyway on the end of the crankshaft ruining it which caused alot of people to replace the motor so there's a set of heads all ya need now is a set of 2.5 head gaskets and your up and running the 1.8 intake and exhaust will bolt right up and plug right in. You might need to use the cam angle sensor off of your 1.8 because it differes from the 2.2 sometimes but it will still plug right up, use the 1.8 cam sprockets and timing belt and your set to go. I don't know what a 2.5 with bent valves costs because I had 3 laying around but they can 't be that expensive, and 2.2 heads are real cheap, I found some for $10 each then $86 for a set of '04 STI headgaskets from SOA.
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Old 03-12-2006, 11:18 PM   #13
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BTW I can catch rubber shifting to 2nd without trying and 5th pulls great at 1500rpm's so the torque increase is great.
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Old 03-13-2006, 12:43 PM   #14
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Quote:
Originally Posted by *subaru or nothing*
Well, as for the price of rebuilding i am not too worried about that because i work in an auto parts store so i get parts at extremely good prices and i also have a very close family friend who owns a mechanics shop and i know many other people who own shops. so i dont think money will be the problem.for the most part i will keep it stock,i will bore it a little bit and try to get a aftermarket camshaft and things like that, but i am not going all out on this engine, as i do not need a whole lot more power in that little car, but if i was to buy a 2.2 i would try to get as much power as possible out of it to try to match a 2.5.
Ok, so let's say you get your parts for rebuild for $600 instead of $80 because you have parts accounts. But then you are going to spend $200-500 on cams and $500 minimum on pistons to overbore it. It still not going to be "cheap" whether or not you don't think you are building a monster. Suit yourself. It's a lot of money to spend when you can buy a good used engine for the same or less. But sometimes the fun of the build is more important than the bottom line cost...
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Old 03-13-2006, 01:57 PM   #15
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hmm i really wanna do this to my car but my car is a 93 w/ auto so will that make it much worse?
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Old 03-13-2006, 05:09 PM   #16
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shouldn't be too bad the one that I built is a 93 w/ 5-spd
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