----- Original Message -----
From: >Ssspoon@aol.com
To: >teaguesauto@worldnet.att.net
Sent: Sunday, September 23, 2001 5:39 AM
Subject: 2.5 heads on 2.2 turbo block?
Hi Dale and Teague's Auto
I've been searching for info off and on for a few months about swapping the 1999-2000 2.5 heads onto the 2.2 Turbo Legacy block.
Answers have come back from both ends of the spectrum and a few in between;
I've seen two sides of the compression issue;
"It was stated that putting the DOHC heads on will definitely work, but your compression ratio is going to drop to about 7.7:1"
"If you're changing over to the EJ25 Phase 2 SOHC heads, you'll raise your compression from ~ 8.5:1 to ~ 9.2:1"
I've seen engine management issues;
"The cam profiles might indeed screw up the timing of the injectors and spark. Maybe this is why most people doing this swap usually have a boatload of piggyback controllers or a whole new engine management system."
I've seen disagreement with the whole idea;
"If you already have the 2.2 heads, take the time to work them. They can outflow and outperform the 2.0 and the 2.5 heads. Valve size can be increased to be larger than the 2.0 heads or the 2.5 heads."
I saw on your website where your Imprezza project car was using 2.5 heads on a 2.2 turbo block. All of the above have come from opinion, theory, and conjecture from individuals that had not actually completed a 2.5 for 2.2 swap. But all suggest a swap can be accomplished.
Then how do we explain the most curious of all, from a Subaru 1991 Model Year Update Course Reference Booklet, comparing 2.2 turbo heads to 2.2 normally aspirated heads, which I have assumed would be true for the 2.5 N/A heads;
"The turbo block enjoys a closed deck vs an open deck for the N/A block. The cylinder heads have been modified and the coolant passages in the heads have been changed to match the new block design. The heads are NOT interchangeable side to side nor with the N/A engine...there are 3 holes in the right head for the turbo oil supply, oil return, and coolant return. The new heads require new head gaskets with water ports repositioned to match the passages in the cylinder block. A right side camshaft support has been added to the turbo engine in order to supply oil to the turbo and return coolant from the turbo. The camshaft has a new profile designed to match the characteristics of the turbo engine."
So would you please provide some insight on the issues above? I'm sure a whole bunch of people on a Turbo Legacy email list I'm a member of, would really appreciate your experience with this swap.
Thank you very much,
Larry Witherspoon
Subj: Re: 2.5 heads on 2.2 turbo block?
Date: Mon, 24 Sep 2001 9:14:56 AM Eastern Daylight Time
From: "Teague's Auto" <teaguesauto@worldnet.att.net>
To: <Ssspoon@aol.com>
I have had several customers do the swap. The Single overhead cam 2.5 heads stock will flow better than the 2.2 turbo heads after they have been ported and polished. So that means if you port and polished the 2.5 heads they would flow even better. As far as issue of the ports lining up and the water jackets that can not be a issue since I have sold so many 2.5 single over cam heads and 2.2 turbo blocks. Someone would have said they had problems... Whether it is a better combo than another setup I do not know because I don't think anyone has run the setup on a dyno. But I can tell you it is a lot more reliable than turboing a 2.5 block or a 2.2 N/A block since the 2.2 turbo is made for forced induction. The 2.5 block runs good with a turbo but it will not last long. I know from first hand because I sell the blocks to the customers who have them turboed and tell everyone on the message boards they don't have problems. They don't list how many short blocks they have blown in the !
process.
Thank you for your request.
Dale Teague (Teague's Auto)
http://www.teaguesauto.com
>teaguesauto@worldnet.att.net
------------------------ ---------------------~-->
Monitoring Service trial
http://us.click.yahoo.com/MDsVHB/bQ8CAA ... /XoTolB/TM
---------------------------------------------------------------------~->
To unsubscribe from this group, please send an email to:
BC-BFLegacyWorks-unsubscribe@egroups.com
2.5 heads on 2.2 block questions and answers
Moderators: Helpinators, Moderators
-
acroxford@hypermall.net
2.5 heads on 2.2 block questions and answers
The man has made some good points Larry I really wouldn't mess around
trying to put any DOHC heads on a turbo block because the gain is not
very much unless you are prepared to go all the way and reset the cam
timing and all and you would have to make oil lines and a oil drain
for the turbo. All of this for a very marginal gain as the VE of the
turbo engines is up there already so flow is already good also you
would be installing interferance heads and that means if the timing
belt goes the valves will probably get bent and the whole thing
weighs
more. other than that ?? If any thing I would get some EJ2.0t heads
and do what the Autospeed article describes it works and they say the
increase in torque help quite a bit.
--- In BC-BFLegacyWorks@y..., ssspoon@a... wrote:
> ----- Original Message -----
> From: >Ssspoon@a...
> To: >teaguesauto@w...
> Sent: Sunday, September 23, 2001 5:39 AM
> Subject: 2.5 heads on 2.2 turbo block?
>
> Hi Dale and Teague's Auto
>
> I've been searching for info off and on for a few months about
swapping the 1999-2000 2.5 heads onto the 2.2 Turbo Legacy block.
> Answers have come back from both ends of the spectrum and a few in
between;
>
> I've seen two sides of the compression issue;
> "It was stated that putting the DOHC heads on will definitely work,
but your compression ratio is going to drop to about 7.7:1"
> "If you're changing over to the EJ25 Phase 2 SOHC heads, you'll
raise your compression from ~ 8.5:1 to ~ 9.2:1"
>
> I've seen engine management issues;
> "The cam profiles might indeed screw up the timing of the injectors
and spark. Maybe this is why most people doing this swap usually have
a boatload of piggyback controllers or a whole new engine management
system."
>
> I've seen disagreement with the whole idea;
> "If you already have the 2.2 heads, take the time to work them.
They can outflow and outperform the 2.0 and the 2.5 heads. Valve
size
can be increased to be larger than the 2.0 heads or the 2.5 heads."
>
> I saw on your website where your Imprezza project car was using 2.5
heads on a 2.2 turbo block. All of the above have come from opinion,
theory, and conjecture from individuals that had not actually
completed a 2.5 for 2.2 swap. But all suggest a swap can be
accomplished.
> Then how do we explain the most curious of all, from a Subaru 1991
Model Year Update Course Reference Booklet, comparing 2.2 turbo heads
to 2.2 normally aspirated heads, which I have assumed would be true
for the 2.5 N/A heads;
>
> "The turbo block enjoys a closed deck vs an open deck for the N/A
block. The cylinder heads have been modified and the coolant
passages
in the heads have been changed to match the new block design. The
heads are NOT interchangeable side to side nor with the N/A
engine...there are 3 holes in the right head for the turbo oil
supply,
oil return, and coolant return. The new heads require new head
gaskets with water ports repositioned to match the passages in the
cylinder block. A right side camshaft support has been added to the
turbo engine in order to supply oil to the turbo and return coolant
from the turbo. The camshaft has a new profile designed to match the
characteristics of the turbo engine."
>
> So would you please provide some insight on the issues above? I'm
sure a whole bunch of people on a Turbo Legacy email list I'm a
member
of, would really appreciate your experience with this swap.
>
> Thank you very much,
>
> Larry Witherspoon
>
>
> Subj: Re: 2.5 heads on 2.2 turbo block?
> Date: Mon, 24 Sep 2001 9:14:56 AM Eastern Daylight Time
> From: "Teague's Auto" <teaguesauto@w...>
> To: <Ssspoon@a...>
>
> I have had several customers do the swap. The Single overhead cam
2.5 heads stock will flow better than the 2.2 turbo heads after they
have been ported and polished. So that means if you port and polished
the 2.5 heads they would flow even better. As far as issue of the
ports lining up and the water jackets that can not be a issue since I
have sold so many 2.5 single over cam heads and 2.2 turbo blocks.
Someone would have said they had problems... Whether it is a better
combo than another setup I do not know because I don't think anyone
has run the setup on a dyno. But I can tell you it is a lot more
reliable than turboing a 2.5 block or a 2.2 N/A block since the 2.2
turbo is made for forced induction. The 2.5 block runs good with a
turbo but it will not last long. I know from first hand because I
sell
the blocks to the customers who have them turboed and tell everyone
on
the message boards they don't have problems. They don't list how many
short blocks they have blown in the process.
>
> Thank you for your request.
> Dale Teague (Teague's Auto)
> http://www.teaguesauto.com
> >teaguesauto@w...
------------------------ ---------------------~-->
FREE COLLEGE MONEY
CLICK HERE to search
600,000 scholarships!
http://us.click.yahoo.com/47cccB/4m7CAA ... /XoTolB/TM
---------------------------------------------------------------------~->
To unsubscribe from this group, please send an email to:
BC-BFLegacyWorks-unsubscribe@egroups.com
trying to put any DOHC heads on a turbo block because the gain is not
very much unless you are prepared to go all the way and reset the cam
timing and all and you would have to make oil lines and a oil drain
for the turbo. All of this for a very marginal gain as the VE of the
turbo engines is up there already so flow is already good also you
would be installing interferance heads and that means if the timing
belt goes the valves will probably get bent and the whole thing
weighs
more. other than that ?? If any thing I would get some EJ2.0t heads
and do what the Autospeed article describes it works and they say the
increase in torque help quite a bit.
--- In BC-BFLegacyWorks@y..., ssspoon@a... wrote:
> ----- Original Message -----
> From: >Ssspoon@a...
> To: >teaguesauto@w...
> Sent: Sunday, September 23, 2001 5:39 AM
> Subject: 2.5 heads on 2.2 turbo block?
>
> Hi Dale and Teague's Auto
>
> I've been searching for info off and on for a few months about
swapping the 1999-2000 2.5 heads onto the 2.2 Turbo Legacy block.
> Answers have come back from both ends of the spectrum and a few in
between;
>
> I've seen two sides of the compression issue;
> "It was stated that putting the DOHC heads on will definitely work,
but your compression ratio is going to drop to about 7.7:1"
> "If you're changing over to the EJ25 Phase 2 SOHC heads, you'll
raise your compression from ~ 8.5:1 to ~ 9.2:1"
>
> I've seen engine management issues;
> "The cam profiles might indeed screw up the timing of the injectors
and spark. Maybe this is why most people doing this swap usually have
a boatload of piggyback controllers or a whole new engine management
system."
>
> I've seen disagreement with the whole idea;
> "If you already have the 2.2 heads, take the time to work them.
They can outflow and outperform the 2.0 and the 2.5 heads. Valve
size
can be increased to be larger than the 2.0 heads or the 2.5 heads."
>
> I saw on your website where your Imprezza project car was using 2.5
heads on a 2.2 turbo block. All of the above have come from opinion,
theory, and conjecture from individuals that had not actually
completed a 2.5 for 2.2 swap. But all suggest a swap can be
accomplished.
> Then how do we explain the most curious of all, from a Subaru 1991
Model Year Update Course Reference Booklet, comparing 2.2 turbo heads
to 2.2 normally aspirated heads, which I have assumed would be true
for the 2.5 N/A heads;
>
> "The turbo block enjoys a closed deck vs an open deck for the N/A
block. The cylinder heads have been modified and the coolant
passages
in the heads have been changed to match the new block design. The
heads are NOT interchangeable side to side nor with the N/A
engine...there are 3 holes in the right head for the turbo oil
supply,
oil return, and coolant return. The new heads require new head
gaskets with water ports repositioned to match the passages in the
cylinder block. A right side camshaft support has been added to the
turbo engine in order to supply oil to the turbo and return coolant
from the turbo. The camshaft has a new profile designed to match the
characteristics of the turbo engine."
>
> So would you please provide some insight on the issues above? I'm
sure a whole bunch of people on a Turbo Legacy email list I'm a
member
of, would really appreciate your experience with this swap.
>
> Thank you very much,
>
> Larry Witherspoon
>
>
> Subj: Re: 2.5 heads on 2.2 turbo block?
> Date: Mon, 24 Sep 2001 9:14:56 AM Eastern Daylight Time
> From: "Teague's Auto" <teaguesauto@w...>
> To: <Ssspoon@a...>
>
> I have had several customers do the swap. The Single overhead cam
2.5 heads stock will flow better than the 2.2 turbo heads after they
have been ported and polished. So that means if you port and polished
the 2.5 heads they would flow even better. As far as issue of the
ports lining up and the water jackets that can not be a issue since I
have sold so many 2.5 single over cam heads and 2.2 turbo blocks.
Someone would have said they had problems... Whether it is a better
combo than another setup I do not know because I don't think anyone
has run the setup on a dyno. But I can tell you it is a lot more
reliable than turboing a 2.5 block or a 2.2 N/A block since the 2.2
turbo is made for forced induction. The 2.5 block runs good with a
turbo but it will not last long. I know from first hand because I
sell
the blocks to the customers who have them turboed and tell everyone
on
the message boards they don't have problems. They don't list how many
short blocks they have blown in the process.
>
> Thank you for your request.
> Dale Teague (Teague's Auto)
> http://www.teaguesauto.com
> >teaguesauto@w...
------------------------ ---------------------~-->
FREE COLLEGE MONEY
CLICK HERE to search
600,000 scholarships!
http://us.click.yahoo.com/47cccB/4m7CAA ... /XoTolB/TM
---------------------------------------------------------------------~->
To unsubscribe from this group, please send an email to:
BC-BFLegacyWorks-unsubscribe@egroups.com