EJ22T pistons
 

I've been researching the hell out of the SVX for a couple months now (month or so before I bought it is when I started) And I have ran into something.

A lot of people are apparently using EJ22T pistons in the EG33 block. I mean it makes sense, it is basically an EJ22 engine with 2 extra cylinders added on.

Now everything I have read of to this point is internet chatter. Some people claimed they run them and it lowers the compressions ratio. I would like to run them on my build, but a forged set and bore it .20 out. Let me know if anyone has any knowledge of this!

Re: EJ22T pistons
 

Who is running Ej22T pistons in an EG33? In this forum?

Man, compression will go waaaaaaaaay down to 7.1:1 (or something)...

And THE SEARCH BUTTON is your bestestest friend :D

Re: EJ22T pistons
 

AFAIK stock compression ration on the EJ22T is 8.0, so that would be the same as the compression you should get on the pistons swapped into the EG33.

Re: EJ22T pistons
 

Who told you that the head domes of both engines is the same for you to conclude that?

Re: EJ22T pistons
 

Do cranks have same rotational offset??? also are they both using same con-rod length???

Re: EJ22T pistons
 

well doing more research, the pistons will drop cr to 7.9:1 which is just fine for me. The rods ARE the same as all EJ rods EXCEPT for N/A 2.5 rods. There is some Journal differences but EJ22T rods have the same journal sizing (48mm i believe)

Re: EJ22T pistons
 

Excellent, let us know about the build and outcome of your project.

BTW, here you saw the 7.9:1 compression or was it here?

Re: EJ22T pistons
 

I haven't heard of a motor running a ratio lower than 8.5:1, wonder how thats gunna work out.

My very limited research is the rods are about the same, as to the best of my knowledge Eagle only makes one Subaru rod for several motors.

Re: EJ22T pistons
 

ej22t stock engine on 1991-94 turbo legacies was under 8 something.

Re: EJ22T pistons
 

This guy on eBay claims that the SVX in the auction was running EJ22T pistons for 20k without issues, and using regular unleaded the whole time. :eek: He's also claiming the compression ratio was 8:1. Maybe ask him directly thru ebay if he had any problems? Maybe he's even a member here?

Re: EJ22T pistons
 

hahahahahah nice laugh before I go to sleep. Funny guy the owner is!

Re: EJ22T pistons
 

EJ20/EJ22 Rods are the same as EG33.

Ask Tom.
But im pretty sure he said that running EJ22T pistons in a EG33 will be to low compression for any turbo projects any one would want to do.

Re: EJ22T pistons
 

The NA 2.5L rods, years 2000 up are 1mm longer. The crank pin and piston pin are the same as SVX.

Use late 2.5L rods, and then trim the piston top accordingly. You will end up with a dish that is 1mm less deep, slightly raising the comp ratio. Of course the top ring will be 1mm closer to fire, but the compression distance is already substantial on these pistons.

Re: EJ22T pistons
 

What about the squish area?

Re: EJ22T pistons
 

Tom,

I mentioned it, trim the piston top accordingly, to compensate for the longer rod. Actually, one would be able to set a specific quinch area by exact machining of the piston top [really the flat area around the dish], but the amount to remove from the top is +/- 1mm/.040". As I said, you have effectively raised the bottom of the dish by 1mm, and that will raise the compression ratio accordingly.