legacycentral bbs

I have a 95 wagon with a 2.2 5 spd. I have a phase 1 2.5 shortblock. I also have 2.2 heads from a 90 NA 2.2 legacy. I have heads from a early ej20g with rockers arms but no cams, cam gears or valve covers.

I want to make a franken 2.5 motor for this car. I dont want to dump a ton of money on it but willing to do bang for the buck stuff. Like port them myself and my uncle will do a 3 angle valve job. Cams from delta. Stuff like that. Though I dont want to change ecus so the stock 2.2 ecu will be retained. Yes power will suffer but I dont want to go down that road just yet in the DD.

Now heres the deal. I saw heads from a legacy turbo on here. The intake valves are small compared to any of the turbo or 2.5 stuff. I would assume thats what the NA heads will look like too. (I have a long 2.2 motor assembled from my other wrecked wagon.) That being the case I thought about using the ej20g heads. I dont know what the CC volume is though. Plus I dont have anything to fill them with. I was thinking about using 2.5 phase 1 heads to fill the ej20 heads. Or use the complete phase 1 96 2.5 heads. I can use the cams, gears and valve covers from a 96 2.6 head correct?

If I use the 2.5 head or the 20g head which gasket should I use?


Any help or opinions would be useful.

If you are going NA, just use all the 2.5 stuff. The 2.0 cams are setup for turbo, while the 2.5, are set up for NA...

Well duh. I dont have cams for the turbo heads anyway. I was going to use the ones from a 96 2.5. Those are supposed to be the same type of valve train but only that year.

I'm pretty sure the 2.5 cams wont go into the EJ20G heads, they use a different lash adjuster design. And the EJ20G heads have a very large chamber so the CR woyld be very low. I think the 2.5 heads are the way to go.

Gary

The 2.5 heads have a large chamber as well - so you're going to get lowered compression whether you go ej20 or ej25.

I would go with doug on this one... Avoid the trouble of trying to mix/match and just stick with the 2.5 heads. They'll work fine.

You are going to significantly lower your compression though. You are going to lose gas mileage and lots of power....

The compression is actually reduced enough that you could probably run a turbo off the setup as long as the shortblock is in good shape.

So your saying I will get low CR using all stuff for a phase 1 2.5? How can that be if the stock CR is 9.7 or so.


What is the volume of the ej20g vs the ej25d heads?

Like I said the 96 2.5 heads have the same configuration I am told as a ej20g. It is only the 96 stuff in 97 it was different.

Can anyone confirm any of this infomation to be true or false?


Am going to be using the phase 1 2.5 block. Just to clarify. I want to know what heads to use on the p1 2.5 block not the 2.2 thats just what is currently in the car now. Sorry for any confusion.

Lol, thought you were mixing/matching heads/block.

Yeah, you should be fine with all ej25 stuff....

EJ25 P1 (DOHC) chambers = 49cc

EJ20G chambers = 56cc

I've got both heads and the ports are nearly identical, tho the 2.5s seem to be a cleaner casting thats better formed and have a more pronounced knife edge between the intake ports. And the 2.5s have shorter valve guides that open up more port volume. I'd say the 2.5s are the better heads.

Good point gto7419, EJ20G heads on the 2.5 block might make a very good turbo setup.

Gary

All_talk wrote:EJ25 P1 (DOHC) chambers = 49cc

EJ20G chambers = 56cc

I've got both heads and the ports are nearly identical, tho the 2.5s seem to be a cleaner casting thats better formed and have a more pronounced knife edge between the intake ports. And the 2.5s have shorter valve guides that open up more port volume. I'd say the 2.5s are the better heads.

Good point gto7419, EJ20G heads on the 2.5 block might make a very good turbo setup.

Gary

Thank you this is what I wanted to know.

Though what year 2.5 head do you have? I would like to know if the 96 valvetrain is or isnt the same as rocker arm 20g heads.

I believe you need to clarify which EJ20g heads you are talking about. From what I have seen, Legacy EJ20g (stub rocker) heads have a larger chamber than WRX EJ20g (Cam over bucket) heads.

I believe the Phase 1 DOHC heads are based on the WRX versions.

"EJ20G WRX" heads are EJ20K, and yes that are shim/bucket type, I'm not sure about the chamber size but I do believe they are smaller.

Legacy/Liberty EJ20G heads are the post and arm type.




My 2.5 DOHC head are currently mocked up on my 2.2T block in my car to sort out the piping for my VF24 and TMIC, so no pic but they are bucket/shim type. They came out of a '96 GT, but the engine had been replaced in that car, so I cant be sure they are '96 heads.




Two other advantages of the shim/bucket heads are that they are less prone to the cloging/ticking that can happen to the earlier style and are supposed to be good for 7500 RPM (assuming you can get passed the rev limiter in the stock ECU).

Hope this helps
Gary

The "arm and stub" heads can rev very well too. There is a guy on RS25 that takes his to 7500 daily.

I ran into another problem though. I was going to use the intake manifold from the 95 and put that on top of the phase 1 short block but the intake bolt pattern is different. It looks like it is a phase 2 pattern. Before I go to the dealer and look at the gaskets for the two does anyone know for sure they are different. I think they might be different but I wont know by how much till I look.

Well I took a look at the gaskets. You could make it work if you wanted to. You will have to elongate holes. Though the manifold on the 2.2 is alot smaller than the 2.5. So I will just use the 2.2 heads. Damn what a big circle.