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How does this work? What would my compression ratio be?

I tried to look around a little bit but I don't have a lot of time atm.

those heads are useless. use ej20g/k/h heads if you actually want to make power.

Yeah, you're using the worst of each engine.

The EJ22T block is stronger, with more displacement, and the EJ205 has much better heads... they flow better on top of being DOHC.


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This is what was suggested to me for a cheap replacement to my blown ej22t since I do not have much cash.

I have the heads and can get the block cheaply.

In your other thread we suggested an EJ20G block. That's a fully Phase I setup. What you are planning with the EJ205 is a Phase II block with Phase I heads. According to some others around here, that causes some oil/coolant passages between the block and heads to not line up perfectly. Using the EJ205 open deck block though, might make it work better since those problems are usually in reference to PII heads on a closed-deck PI block like ours.

Your compression ratio will also tank, it will be close to 7:1 which will make for poor fuel economy and late spool and a lack of power.

You would have to swap the crank gear from your old motor so the ECU will be able to read the crank signal. The coolant crossover pipe will have different sensors and different places for them. You'll have to do some re-wiring and maybe tap a couple holes in it for your EJ22t sensors.

Sounds like in a low budget situation it would be easier and better and probably cheaper to just find and use a naturally aspirated EJ22 block from a 90's Subaru and run the wastegate line to the turbo output so you are always stuck at wastegate boost. And run premium fuel. That should last just fine, it will give you a bit higher compression ratio (9:1) which will help fuel economy and off-boost power, it will last just fine as long as you get a good EJ22 block, and you won't have any incompatibilities between the wiring, sensors or any engine parts. You would have to use your EJ22T water pump, and depending on year of shortblock you would use your own coolant crossover pipe as well.

How reliable would a n/a 2.2 really be? I don't want to have to change the motor out again a few months down the road.

I mean, once I get more cash I'll be rebuilding my ej22t, but I want something that will last until I can do it right.

What is the waste gate boost set at?

The 2.2na is extremely reliable and a cheap swap to perform if ur on a budget

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Oh I know they are reliable without the turbo, I'm just wondering how well it will cope when turbo'd.

Looking around the internet I hear mixed results.

It will cope just fine. They're some of the toughest engines Subaru has ever built. The EJ22E and EJ22T share the same forged bottom end, and though the EJ22E block is open-deck, that doesn't mean it's not durable.

Do what Alphius said and set it up to run wastegate boost, and make sure you run premium, and it should be just as reliable as the original.


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Ok, so I found an ej22 for $200, what all would I need to swap over from my 22t?

Also, I know this is just a budget necessity at the moment, but any ideas how much power it would be putting down?

You need to figure out how your turbo is going to get oil, as the oil feed line will be missing from the EJ22E head.

Is it an AT or MT? If it's a MT, then you'll need to swap over your flywheel and clutch assembly to the EJ22E engine.

As Alphius said, you'll need to swap over your water pump as well, as the nonturbo water pump aims the thermostat straight down, and that will hit your exhaust manifold.


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Can I just use my 22t heads?

Yes you can just use the turbo heads. In that case everything will bolt up like factory except for the waterpump needs switched. If anything else is different between the two motors as you are swapping, just put the right one on the new motor.

It will be perfectly reliable, and should only lose 10-15 hp from a real EJ22t. You are gaining a point of compression but losing some boost. Off-boost response will be a little better. Wastegate boost on a VF11 is around 5.5 psi, which the EJ22E will take easily since it'll be controlled by the Turbo ECU with proper timing control and have premium running through it. As they said before, the forged bottom end is exactly the same on an EJ22E, the only differences are the closed deck block, piston oil squirters and low compression pistons.

Yes, you can do that, and I think that's what Alphius was talking about in his first post. You'll lower your compression slightly from the nonturbo heads (EJ22Es are 9.5:1), which will be a bit safer.


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Don't you guys always run premium fuel in your Turbo engines?

Rubasu wrote:Don't you guys always run premium fuel in your Turbo engines?

Yes

Rubasu wrote:Don't you guys always run premium fuel in your Turbo engines?

Of course. Just reiterating it to drive home the point that the hybrid will definitely need premium.

DerFahrer wrote:Yes, you can do that, and I think that's what Alphius was talking about in his first post. You'll lower your compression slightly from the nonturbo heads (EJ22Es are 9.5:1), which will be a bit safer.


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Everything I can find states that EJ22T and EJ22E heads have the same chamber size. Is that not true?

So, just out of curiosity, is there any way I can make it safely run more boost?

I have a few tmic's sitting around, and is it possible to use the pistons from my 22t if they are in good shape?

Looking around more I see some people saying they have run more boost and had good results with the motor, for a while at least.

More boost on the high compression block would be possible, but without a way to pull timing you would have lots of detonation and the motor wouldn't last long at all. I thought you just wanted to get by cheaply for a while?

If you wanted to you could use the EJ22T pistons and get your 8:1 compression back. Then you could treat it like any other EJ22T and it would probably be fine. The open deck block might kick the bucket eventually, but probably would be fine at the stock boost level of 9psi for as long as you wanted to run it.

so far the n/a 2.2 block in my winter beater impreza has been nothing but reliable, currently making 225awhp and i beat it to death and have had zero issues. with the stock ecu and stock heads at wastegate boost, you will be completely fine

"I thought you just wanted to get by cheaply for a while?"

Well, yeah, but in the words of Jeremy Clarkson: "Poooweeeerrr!"

So one other possibility popped up, could anything be done with a DOHC ej25 block?

The EJ25 block would give you more displacement but would also significantly raise your compression to the point where even wastegate boost and premium gas would be dangerous. You would be looking at a compression ratio of around 10.8:1 with the EJ22T heads on there.

So, the answer is probably yes, but if I got a whole 2.5 for cheap, could it also cope with a little bit of boost?

It probably could hold up to wastegate boost but then you are stuck adapting the EJ22T harness and injectors to the EJ25 and you would need to drill and tap the heads for oil and coolant feed/return.

Easiest still is just doing the EJ22 shortblock under your EJ22T heads. Probably makes the same power as the ghetto-fab EJ25/turbo setup you are talking about since you could use your EJ22T pistons in the EJ22 block and still run your 9-10psi safely. Versus the safe 5 psi and lots of work on the EJ25 block/heads.

Ok...well it was a thought anyway.