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Old 06-28-2000, 02:47 PM   #1
Trey
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Member#: 670
Join Date: Dec 1999
Chapter/Region: TXIC
Location: Austin, the Republic of Texas
Post Attn: All '98 2.5RS Owners - Survey

To all '98 2.5RS owners,

Please take a lot at the following picture


The little red hand above it pointing to a location on the side of the engine closest to the air box, furthest from the battery. There will be a raised casting mark which runs parallel to the the front of the engine. It's located right in front of the "JAPAN" and Fuji Logo. If you have two, they will be within 1 inch of eachother.

Here's what I need to know.
1) In the location shown below, do you have one raised ridge or two.
2) Vehicle Production month/year (found on driver's side inner door sill.)

For example:
1) 2 ridges
2) 2/98

If there are any questions, please let me know.

I really appreciate the help. I doing a bit of research and will post my findings once I get all the data sorted out.

Take care,
Trey
CobbTuning.com
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Old 06-28-2000, 03:28 PM   #2
DAVE98RS
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Location: Drives a Ford Interceptor
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<<98 2.5RS(RIP)>>
02, Cobb stg 2.5, FMIC

Post

Trey,
Mine has two ridges and the production date is 7/97. What's this about if you don't mind me asking?
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Old 06-28-2000, 04:42 PM   #3
Trey
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Post

Ok, here's the deal. Hopefully this information will encourage some of you to go outside for a second and pop your hood for me so I can collect some of this data.

If you have 1 ridge, you have a Phase II block with DOHC heads. If you have 2 ridges, you have the Phase I block. Andre dropped off his old engine out of his MY98 and when I pulled it apart I realized it was a Phase II block. This means Subaru, at some point, possibly began using Phase II blocks in some MY98 2.5RS models (or maybe they just gave Andre a special one for being a nice guy). I'm hoping to figure out a timeframe in which Subaru made the switch.

Thanks to everyone who helps us with this survey,
Trey
CobbTuning.com

Oh and Andre, what's your production date?
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Old 06-28-2000, 05:01 PM   #4
Andre Vandenberg
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1998 2.? RS Turbo ;)
RBP

Post

05/98
I believe mine was in the last batch of MY98's produced.
See this Sat. Trey, Cant wait to try the car with all the goody's!!!!
Andre
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Old 06-28-2000, 05:13 PM   #5
bill harvey
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2005 Legacy Gt wagon
Garnet red pearl

Post

well i can't see the marks i am looking for in the pic but my car was made 10/97. i think dale teagues can tell you when the switched hopefully since mine was made after daves i hope i have the phase 2 block also.
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Old 06-28-2000, 08:14 PM   #6
Scoobaru
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Post

My car has 2 stamps (if I looked in the correct spot) the stamps are a 2 and a 6 if that means anything.... And the production date is 01/98
What would the differences be between a phase 1 and a phase 2 engine for those of us who don't have a clue
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Old 06-28-2000, 08:17 PM   #7
Multiapex
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Post

well that's interesting! here you go:
1)2 ridges
2)1/98
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Old 06-28-2000, 08:49 PM   #8
Joel Gat, 1.8L
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Post

Hello,

I'll edit this later and let you know what's on my known-to-be phase-ii bottom end/phase-i top end engine Trey, I'm a little surprised that "when [you] pulled it apart [you] realzed it was a Phase II block." How many bolts does it use to hold the tranny? Or are you saying that Subaru changed the internals before changing the entire casting for the engine?

Joel
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Old 06-29-2000, 06:41 AM   #9
Trey
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Post

Joel,

No, the casting is a Phase II casting for the 7-bolt tranny. The motor had already been disassembled once and didn't even have the crank in it so I wasn't taking my usual time to study every detail. I was too much in the "zone" to see what the bearings looked like after seeing the state of dispair his crank was in. I had the engine sitting bellhousing side down on the workbench and didn't even look.

When I spent all of 5 minutes to split the block I immediately noticed the thrust bearing location and THEN looked at the rear casting where the transmission bolts up. Of course a good forehead slapping was in order after I looked at the transmission bolt hole locations. I just wasn't expecting a MY98 2.5RS to have the hybrid block in it. I knew some of the '99 Legacy's had them (like the block you have Joel) but didn't think they did that with the Impreza 2.5RS. Guess I was wrong!

There are alot of differences in the casting (including the way the transmission bolts up), but I figured those ridges on the front are the easiest to see when the engine assembled and in the car.

As for the difference between the Phase I and Phase II, it was an evolutionary change in how Subaru built their engines. I'll have a section up on our web site documenting the differences.

Thanks,
Trey
CobbTuning.com
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Old 06-29-2000, 07:07 AM   #10
BoomerRS
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Vehicle:
98 RS
****in Rally Blue

Post

I will check at lunch time
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Old 06-29-2000, 07:55 AM   #11
Mike Moffa
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9805 STi V3 -LegGT05
Rally Blue - Satin White

Post

Oh nice. I cant wait to check that out.. I know that my car (98RS) was made in 98 not 97.. my car is at the dealer right now, but I should check that tonight.

I will let you know.
take care
Mike M
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Old 06-29-2000, 08:12 AM   #12
ColinL
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'01 Erion CBR 929

Post

Trey, do the hybrid DOHC Phase II blocks also have regular pistons or are they still using the skirtless type?
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Old 06-29-2000, 09:30 AM   #13
BoomerRS
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Member#: 1271
Join Date: Apr 2000
Location: W Hartford, CT USA
Vehicle:
98 RS
****in Rally Blue

Post

OK... I did not think I was looking in the right spot but I was... two lines. Production date for mine is 8/97.
The Phase I and II blocks are different visually correct? One obvious difference is the placement of the spark plugs... on the Phase I they are lower on the block. On the Phase II they are up higher and angled. Am I right on this?
Trey let us know what you find.
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Old 06-29-2000, 09:32 AM   #14
FatChanceTi
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Post

Manuf. 4/98
My car appears to have one raised ridge (if that is what you are referring too. It is a raised rib that is just in front of the JAPAN stamping.

Last edited by FatChanceTi; 09-16-2006 at 12:11 AM.
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Old 06-29-2000, 09:39 AM   #15
boxerman
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Location: Hoboken, NJ, USA
Post

Boomer,
Spark plug location is dependant on the heads you are using (DOHC or SOHC) rather than the type of block (phase 1 or 2). I suppose the easiest way to tell without getting under the car is Trey's.
Tim
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Old 06-29-2000, 10:47 AM   #16
98Gal
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1998 Impreza 2.5rs
Black - SOLD

Post

That's pretty neat .. mine is

1 ridge .. made in 11/97
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Old 06-29-2000, 03:10 PM   #17
Black98RS
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Post

I have one ridge on my block and my car was manufactured in 4/98.
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Old 06-29-2000, 03:19 PM   #18
bill harvey
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2005 Legacy Gt wagon
Garnet red pearl

Post

Trey i emailed dale teague and he said that the phaseII started 7/98 i think you should talk to him perhaps he isn't aware of a hybrid. personally i hope i have the phase II even though dale says i have the phase I
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Old 06-29-2000, 07:50 PM   #19
Mike Moffa
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Join Date: Jun 1999
Location: Montreal, Quebec, Canada
Vehicle:
9805 STi V3 -LegGT05
Rally Blue - Satin White

Post

Hi Trey, I also check my car tonight. I only have 1 ridge.. my date is 02/98...
I tell that to my dealer (who are installing my turbo) and they did not know anything about that, but he told me, that I was having a 4 bolts transmission..

Maybe it will explain why that I dont have any trouble with my engine, even after all the race I done with it..

Hope that you are right..

Take care
Mike M


[This message has been edited by Mike Moffa (edited June 29, 2000).]
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Old 06-30-2000, 12:01 AM   #20
nativo
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Join Date: Aug 1999
Location: Coamo, Puerto Rico
Vehicle:
1998 JDM STIv8 6sp
Rally Blue Pearl

Talking

One Ridge
4/98

Nativo

[This message has been edited by nativo (edited June 29, 2000).]
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Old 06-30-2000, 12:11 AM   #21
Steph
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Post

1 ridge... 03/98

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Old 06-30-2000, 12:13 AM   #22
8Complex

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Post

DAVE98RS - 2 ridges, 7/97
nativo - 1 ridge, 4/98

Methinks Subaru just used whatevre block they could find at the time or something. Unless they had to use phase II blocks because all they have was Phase II tranny's at one point (maybe because more Phase I trans's were on backorder).

Interesting... Mine is a MY00, but I'll have to check sometime as well just for my own curiousity.
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Old 06-30-2000, 12:25 AM   #23
Trey
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Location: Austin, the Republic of Texas
Smile

8 - Not necessarily. If it's a production date switch then right now it looks to be sometime between 8/97 (BoomerRS) and 11/97 (98Gal).

We need more owner input but it might be a production date when they made the swap, or it maybe be random. That's what we're trying to figure out.

Good stuff everyone, keep it coming!

Trey
CobbTuning.com
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Old 06-30-2000, 06:15 AM   #24
Boxer4Racing
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Location: Marshall, North Carolina
Post

Bill the results now have me wondering if SOA knows what SOJ put in the car. By the book the Phase II did not start until 7/98 but with the results of some of the members it shows that the phase II was in the cars before that production date. The numbers in the book may be a result of SOA not knowing what SOJ has done. As I have found in the past the book is not always right. But I would say in the end if you have a early production date 98 ie:7/97 then you will have a phase I

So go out and pop those hoods and lets get some good data.

Dale Teague (Teague's Auto) http://www.teaguesauto.com
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Old 06-30-2000, 01:47 PM   #25
bill harvey
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Vehicle:
2005 Legacy Gt wagon
Garnet red pearl

Post

ahhhhh i still can't find the stupid things
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