EJ205 (USDM WRX) block with EJ22T heads?

[ChrisRT]

I have an EJ205 block and am going to pick up some EJ22T heads to mate with it. I'm going to turbo it but I'd like to know what would give me the more reliable compression ratio, my 1.8L heads or the EJ22T heads?

I don't have the money or time to search out other heads so what of these two will be better? I'm not going to run mass HP or torque so it doesn't matter to me about weak flow problems.

I just don't want my engine to blow up from too high of a C.R. when turbod to ~7PSI...

If anyone can answer me this ASAP that'd e swell as I have to pick up the parts in just a few hours.

Oh, and if I use my 1.8L heads I need a 1.8L timing belt but if I use EJ22T heads I need EJ22T timing belt?

Thanks,
Chris

[dscoobydoo]

Curious why you are not using the 205 heads?

What is it going into?

What are your TOTAL plans?

[ChrisRT]

Just had the EJ205 shorty from a wreck. The guy at NASIOC sold those off the engine just before I picked it up. I'll eventually get something else but before I do that, I need answers.

I only have about 5 or so hours before I waste $75+ on heads I may not need.

I've read that the EJ22T heads and the EJ18 heads will make my car have the same C.R.. Is this true? I think I need as low of a C.R. as possible... Will the EJ22T heads with an EJ205 lower it more then EJ18 heads would? What will the C.R. be with whatever head gaskets?

PLEASE, anyone?

[555BCTurbo]

As far as I remember, the chamber size on the EJ18 and EJ22t heads is either very similar or identical, and the compression numbers for either shouldn't be much different. As far as needing the turbo heads, they are already plumbed for the turbo oil and coolant feed and return, which you would have to machine into your EJ18 heads.


$75 for a set of turbo heads ain't half bad...I'd so go for it.

[Matt Monson]

There's no debate. Get the Ej22T heads...

[ChrisRT]

There's no debate. Get the Ej22T heads...

Wow, feisty!

I did and I'm lovin' the feedback and help here. Hope you all don't mind further questions later when I get to installing this thing if I don't find the info I need.

[555BCTurbo]

We love to help...that's what the forum is for...

It is definately preferred that anyone search for their answer before starting a new thread about it...but if you can't find an answer in previous posts...go for it!

[Matt Monson]

There's no debate. Get the Ej22T heads...

Wow, feisty!

You will figure out who I am. I am both confident and opinionated, but I am also usually right. There are some here who pride themselves on making me wrong. I appreciate them because when they do, I learn something that day...

[Arctic Assassian]

And I just absorb everything you say, then duplicate it with not so prime results.

[Matt Monson]

And I just absorb everything you say, then duplicate it with not so prime results.

Maybe I am giving out bad advice again...

[entirelyturbo]

I too am curious Matt. Is there something about the 22T heads that I don't know about that makes them superior to 205 heads?

And while we're at it, did you get my PM?

[Matt Monson]

I too am curious Matt. Is there something about the 22T heads that I don't know about that makes them superior to 205 heads?

And while we're at it, did you get my PM?

I didn't know Ej205 heads were an option. I thought we were discussing Ej18 vs Ej22T.

As for your PM? Probably, but I am terrible with my replies of late. Let me go check my inbox and reply...

[entirelyturbo]

I didn't know Ej205 heads were an option. I thought we were discussing Ej18 vs Ej22T.

I really need to read more . Yes, the 22T heads are in every way superior to the 18E heads. Matt, I believe you've said once that 18E heads are the worst-flowing EJ heads?

[ChrisRT]

I didn't know Ej205 heads were an option. I thought we were discussing Ej18 vs Ej22T.

I really need to read more . Yes, the 22T heads are in every way superior to the 18E heads. Matt, I believe you've said once that 18E heads are the worst-flowing EJ heads?

I thought everyone says that EJ22T heads are the worse... I guess they mean the worst turbo heads.



Oh, I almost forgot! what will my C.R. be with the EJ205 block and EJ22T heads?
What head gaskets do I have to use and will my C.R. be boost friendly?
Will it be friendly enough in N.W. climate running 7PSI on 91 octane to not promote detonation without emanagement?
Also, will my EJ18 intake manifold bold onto my EJ22T heads?

[Matt Monson]

You will want to use the Ej22t head gaskets on this for 3 reasons.
#1 Is because the Ej22T heads have a slightly smaller combustion chamber than Ej205 heads, and the thicker head gasket will compensate a bit for that. However, because of that, you will still be right around 9:1 compression which is still quite boost friendly. Some of Subaru's other turbo motors were 8.8 or even 9:1 compression. You would have to do the math to figure it out exactly. I am not going to to your math for you...

#2 is for reasons of cam timing. The dimensions of the blocks are all the same, so when using the Ej22T heads, it is best to use the head gasket that is correct for that head which will keep the timing belt properly set up and timed. However I will mention that this is probably not really a big issue as we would be talking about +/-.5 degree if timing or so. The problem is that one on cam it advances it that much and on the other it retards it. I drove a car with the wrong headgaskets for quite some time with no real issues, but if you can avoid it why not do so?

#3 is the coolant passages to the heads. I personally feel that this is irrelevant, but other people make a big deal out of it. It's kind of like #2 above. If all other things point to using the stock gasket, then do so...