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Old 09-22-2010, 12:37 AM   #1
MASSSCENE
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Default Non turbo ej25 for free. worth building?

So one of my buddies works at a shop. He recently noticed a subaru engine in the corner and asked the shop manager about it. He said it came out of a forester or outback he wasnt sure. The timing belt snapped and the customer didint want the engine back and he never got around to tossing it. (almost 2 years ago)

I went over and looked at it the following day and it says ej25 on it but thats about all the identification i could find. The only other detail I know is that it is DOHC.

I dont know what car it came out of or what year.

I recently put a 20g on my ej205 and know my days are numbered and would like to have a motor to put in if something happens. I was thinking about ordering a forged piston/rod combo, cams and valve train, light port work,etc.

I just do not know if the crank and block casting are up to the demands that the ej25 out of the sti is. Or if the heads are good, or if I would be better off using my heads.

So as a break down.

Free dohc ej25 NA motor. Is it worth building the short block on it? If so, which heads would be better to use?

If the motor gets built before my stock wrx motor goes than I will put a race gas tune in the ej20 and see what kind of power I can get out of it in completley stock form.


Looking for some info here guys. Anyone use the NA 2.5 blocks?

Thanks. Rich
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Old 09-22-2010, 08:55 PM   #2
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Nothing huh?
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Old 09-22-2010, 10:37 PM   #3
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There is lots of info about people pushing the NA 2.5 blocks on the RS25.com forums. It is viable, better if the engine is phase II (DOHC engines are not phase II except maybe a few rare exceptions) because the crank is supposedly identical to the STI. Slap some STI rods and pistons in it and away you go. Downside is that it is open deck, but so is your EJ205 so it's not a big loss. The phase I engine has smaller journals on the crank and a different stroke, so you can't just drop in STI parts.
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Old 09-23-2010, 08:05 AM   #4
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Are there any identifying marks on the engine or particular accessories/sensors that will identify it?
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Old 09-23-2010, 08:26 AM   #5
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Pull the heads and look at the pistons. Phase I will have a dish to them, while phase II will be flat with valve reliefs. 99% sure it's an EJ25D from a 98 Forester. You can build it for boost, but EJ257 bits will need some work to make fit.

Those heads are great though......and the STi valvetrain is a direct fit (with the exception of cams). WRX cams will fit though, as well as JDM stuff.

Jay
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Old 09-23-2010, 10:05 AM   #6
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Quote:
Originally Posted by Storm View Post
Pull the heads and look at the pistons. Phase I will have a dish to them, while phase II will be flat with valve reliefs. 99% sure it's an EJ25D from a 98 Forester. You can build it for boost, but EJ257 bits will need some work to make fit.

Those heads are great though......and the STi valvetrain is a direct fit (with the exception of cams). WRX cams will fit though, as well as JDM stuff.

Jay
Thanks for the info. I will pull the heads off. Since wrx/sti internals do not fit, what do I order for forged pistons/rods?
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Old 09-23-2010, 10:06 AM   #7
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So all this being said, if i were to build my 2liter am I correct in assuming that the ej25d heads would be better for a built shortblock high revving application?
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Old 09-23-2010, 10:36 AM   #8
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The difference would be negligible as far as high revving. Putting lighter valves/stronger valve springs in either would net about the same result. The EJ25D heads use a different bolt pattern for the intake manifold and would not bolt up to you wrx manifold.
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Old 09-23-2010, 11:21 AM   #9
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Quote:
Originally Posted by MASSSCENE View Post
Thanks for the info. I will pull the heads off. Since wrx/sti internals do not fit, what do I order for forged pistons/rods?
You'd wanna order for the EJ25D specifically.

You can also do some research on what people have done to put an EJ257 rotating assembly into the phase I block and make it work. It's been done, I just don't remember what exactly needs changed.

The heads have the early inline bolt pattern, so an early manifold wil be needed as well. I know the EJ20G manifold works well with those heads.

Jay
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Old 09-23-2010, 09:00 PM   #10
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thanks for the info guys

Last edited by MASSSCENE; 09-24-2010 at 12:21 PM.
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Old 09-23-2010, 11:40 PM   #11
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heads and bellhousing will tell you what it's from. 4-bolt bellhousing and intake manifold bolts all in a line means phase 1 2.5 out of a 96-99.

Not really anything else it could be, and probably not worth spending any money on.
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