2.5 head swap onto 2.2 in 97 outback sport

Afredo · 08-29-2011, 03:31 PM

I've got a 97 outback sport with the 2.2 (stock) and I've been trying to think of anything to do to get more power without doing a swap or a turbo kit or anything as my budget is limited as is my knowledge. Would swapping on 2.5 heads give a bit more power? The motors in the 2.5RS's are pretty much the same block with different heads right? If so how much would this cost me? How difficult is the labor? Thanks!

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Bluefoton · 08-29-2011, 07:06 PM

Here's a head/block chart for you:
http://www.b4et.com/docs/cr_matrix.pdf

AFAIK, you have a EJ22E with a 9.7:1 CR. Doesn't seem like you have a lot of head options...

Afredo · 08-29-2011, 09:46 PM

Quote:

Originally Posted by Bluefoton

Here's a head/block chart for you:
http://www.b4et.com/docs/cr_matrix.pdf

AFAIK, you have a EJ22E with a 9.7:1 CR. Doesn't seem like you have a lot of head options...

if your assumption is correct, according to that chart it appears as though my motor only has one head option, which I assume would be the heads that came on it?

how about doing a lighter-weight flywheel and better-than-oem clutch, would that give me more accleration? I think my clutch is slipping so I probably have to do a clutch in the future anyway.

CosmoTheCat · 08-29-2011, 10:15 PM

lightweight flywheel and pulleys will definitely help with acceleration, but you'll also notice that your car will slow down more on hills unless you get into the throttle more.

Kevin Thomas · 08-30-2011, 05:18 PM

Quote:

Originally Posted by Afredo

I've got a 97 outback sport with the 2.2 (stock) and I've been trying to think of anything to do to get more power without doing a swap or a turbo kit or anything as my budget is limited as is my knowledge. Would swapping on 2.5 heads give a bit more power? The motors in the 2.5RS's are pretty much the same block with different heads right? If so how much would this cost me? How difficult is the labor? Thanks!

How limited is your budget? Do you plan on doing the work yourself?

Matt Monson · 08-30-2011, 05:39 PM

While the 2.5l heads will increase your ability to breath, it will steal away more than a point of compression. Only if you were going to turbo or supercharge your engine would I change to 2.5l heads. And then the only option would be DOHC Ej25D heads from 1996-1999(only on certain models in 1999).

You are better off getting a set of Delta cams and some headers. Also, look down the page a couple of threads to the High Compression Frankenstein thread. Cheap power on the Ej22e comes from changing to the 2.5l block, not the 2.5l heads...

Afredo · 08-30-2011, 08:10 PM

Quote:

Originally Posted by Kevin Thomas

How limited is your budget? Do you plan on doing the work yourself?

Its pretty limited, I don't have much money to spend but would like to be able to get at least a respectable amount of power without making drastic changes. I probably won't do the work myself, I have a buddy who works at a garage with a guy who knows a lot about Subaru's so I'd probably take it there.

Quote:

Originally Posted by Matt Monson

While the 2.5l heads will increase your ability to breath, it will steal away more than a point of compression. Only if you were going to turbo or supercharge your engine would I change to 2.5l heads. And then the only option would be DOHC Ej25D heads from 1996-1999(only on certain models in 1999).

You are better off getting a set of Delta cams and some headers. Also, look down the page a couple of threads to the High Compression Frankenstein thread. Cheap power on the Ej22e comes from changing to the 2.5l block, not the 2.5l heads...

How much do these delta cams run? Looks like Borla makes a set of headers for a little over $300.

CosmoTheCat · 08-30-2011, 09:55 PM

Quote:

Originally Posted by Kevin Thomas

How limited is your budget? Do you plan on doing the work yourself?

Whoa. Not only are you still around, but you're a mod too? When did that happen?

Matt Monson · 08-31-2011, 11:50 AM

Afredo,

Delta cams are less than $200 last time I checked. They will want your core cams back once you install theirs.

Afredo · 08-31-2011, 01:19 PM

Quote:

Originally Posted by Matt Monson

Afredo,

Delta cams are less than $200 last time I checked. They will want your core cams back once you install theirs.

How difficult is a cam installation? Do I have to replace the lifters or valves? Will I have to get a reflash for the computer to recalibrate for the new cams? Got any links for where to get these? Thanks!

Matt Monson · 08-31-2011, 02:20 PM

Just google Delta Camshaft. I think they are also a site sponsor.

Installation isn't much more difficult than doing the timing belt. You do have to remove and reinstall the rocker arms. Doesn't change the valves. Doesn't require any changes to the ECU.

Afredo · 09-16-2011, 11:57 AM

they asked me what style of rocker arm I have, flat or roller style?

08-29-2011, 03:31 PM	#1
Afredo Scooby Newbie Member#: 287657 Join Date: Jul 2011 Chapter/Region: NESIC Location: Upstate NY Vehicle: 1997 Impreza Outback Blue	2.5 head swap onto 2.2 in 97 outback sport I've got a 97 outback sport with the 2.2 (stock) and I've been trying to think of anything to do to get more power without doing a swap or a turbo kit or anything as my budget is limited as is my knowledge. Would swapping on 2.5 heads give a bit more power? The motors in the 2.5RS's are pretty much the same block with different heads right? If so how much would this cost me? How difficult is the labor? Thanks! * Registered users of the site do not see these ads.

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08-29-2011, 07:06 PM	#2
Bluefoton Scooby Specialist Member#: 141373 Join Date: Feb 2007 Chapter/Region: E. Canada Location: Quebec, QC Vehicle: 2008 2.5i-hatch - now with a HID retrofit	Here's a head/block chart for you: http://www.b4et.com/docs/cr_matrix.pdf AFAIK, you have a EJ22E with a 9.7:1 CR. Doesn't seem like you have a lot of head options...

08-29-2011, 10:15 PM	#4
CosmoTheCat Scooby Newbie Member#: 3409 Join Date: Jan 2001 Chapter/Region: NWIC Location: Woolley Vehicle: 1998 Ram 2500 Green.	lightweight flywheel and pulleys will definitely help with acceleration, but you'll also notice that your car will slow down more on hills unless you get into the throttle more.

08-30-2011, 05:39 PM	#6
Matt Monson Scooby Guru Member#: 832 Join Date: Jan 2000 Chapter/Region: RMIC Location: Teh Ghetto Garage, CO Vehicle: 99 2.5RS, '85 911 '73 914 and 2012 BRZ	While the 2.5l heads will increase your ability to breath, it will steal away more than a point of compression. Only if you were going to turbo or supercharge your engine would I change to 2.5l heads. And then the only option would be DOHC Ej25D heads from 1996-1999(only on certain models in 1999). You are better off getting a set of Delta cams and some headers. Also, look down the page a couple of threads to the High Compression Frankenstein thread. Cheap power on the Ej22e comes from changing to the 2.5l block, not the 2.5l heads...

08-31-2011, 11:50 AM	#9
Matt Monson Scooby Guru Member#: 832 Join Date: Jan 2000 Chapter/Region: RMIC Location: Teh Ghetto Garage, CO Vehicle: 99 2.5RS, '85 911 '73 914 and 2012 BRZ	Afredo, Delta cams are less than $200 last time I checked. They will want your core cams back once you install theirs.

08-31-2011, 02:20 PM	#11
Matt Monson Scooby Guru Member#: 832 Join Date: Jan 2000 Chapter/Region: RMIC Location: Teh Ghetto Garage, CO Vehicle: 99 2.5RS, '85 911 '73 914 and 2012 BRZ	Just google Delta Camshaft. I think they are also a site sponsor. Installation isn't much more difficult than doing the timing belt. You do have to remove and reinstall the rocker arms. Doesn't change the valves. Doesn't require any changes to the ECU.

09-16-2011, 11:57 AM	#12
Afredo Scooby Newbie Member#: 287657 Join Date: Jul 2011 Chapter/Region: NESIC Location: Upstate NY Vehicle: 1997 Impreza Outback Blue	they asked me what style of rocker arm I have, flat or roller style?