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Old 01-10-2011, 06:29 PM   #1
PowerShift408
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Default Where can I get an EJ251?

I bought a 99 RS off of here with a blown motor a couple weeks ago and am selling my 93 L to fund a new motor for it. I am not sure exactly what is wrong with the motor, spun bearing is the first guess, but let's put it this way, if you start the car, it is not a pretty sound. Judging by the raucous created, I think I will be best suited to find a new motor for the car. I've searched and searched for a used motor and haven't found **** thus far. If anybody could send me in a good direction to find a replacement motor, I would really appreciate it.
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Old 01-10-2011, 10:26 PM   #2
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Classifieds here or RS25, Craigslist, local junkyards, ect.
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Old 01-10-2011, 11:35 PM   #3
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I have one sitting in my closet in case my worn motor takes a turn for the worse. www.rs25.com has a pretty regular flow of motors and motor parts. That's where I got mine. I'd also suggest looking into simply getting the motor fixed. If you can do most the work yourself, you can buy replacement hardware pretty cheap. This of course depends on what's really wrong with it. You may take it apart and deem it to be a complete loss. You can buy short blocks brand new for not too much or used a good bit cheaper. Heck, you could probably find someone selling another old Impreza with a good engine and something else bad for $200. Just shop around.
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Old 01-11-2011, 12:38 AM   #4
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Just so you know man, the '99 engine is the EJ253, not EJ251.

An EJ251 would work, you'd just have to use the intake manifole from the EJ253.
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Old 01-11-2011, 02:44 PM   #5
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Quote:
Originally Posted by T Wrex--OH View Post
Just so you know man, the '99 engine is the EJ253, not EJ251.

An EJ251 would work, you'd just have to use the intake manifole from the EJ253.
Really? Everything I have seen has left me under the impression that the 253 didn't come out until 05. I very well could be wrong though.
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Old 01-11-2011, 03:15 PM   #6
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Quote:
Originally Posted by T Wrex--OH View Post
Just so you know man, the '99 engine is the EJ253, not EJ251.

An EJ251 would work, you'd just have to use the intake manifole from the EJ253.

UM this is wrong. They didn't make the Ej253 until 05. 99' is a EJ251 DOHC I believe
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Old 01-11-2011, 04:05 PM   #7
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That's what I thought. 99 is actually SOHC though.
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Old 01-11-2011, 06:43 PM   #8
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I was under the impression that the MAF cars, 99, 05+ are EJ253. The MAP cars, 00-04, are EJ251.
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Old 01-11-2011, 06:53 PM   #9
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Quote:
Originally Posted by GEE-OTTO View Post
99' is a EJ251 DOHC I believe
And, UM, this is most definetely wrong. The EJ25D was the DOHC MAF engine used in '98 RS.

EJ251 and EJ253 are SOHC engines.
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Old 01-11-2011, 07:35 PM   #10
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Originally Posted by T Wrex--OH View Post
And, UM, this is most definetely wrong. The EJ25D was the DOHC MAF engine used in '98 RS.

EJ251 and EJ253 are SOHC engines.
Um this is most def lame.

All the OP needs to know is where to get a cheap EJ251 the answer is RS25.com they are up for sale frequently and in most cases running. You can get a used one for under $1000.00 and more like under $800.00. You could get a phase 1 EJ253 from a 05 Impreza 2.5i or Legacy 2.5i the revised EJ253 from a 06-11 impreza
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Old 01-11-2011, 08:43 PM   #11
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Quote:
Originally Posted by GEE-OTTO View Post
Um this is most def lame.

All the OP needs to know is where to get a cheap EJ251 the answer is RS25.com they are up for sale frequently and in most cases running. You can get a used one for under $1000.00 and more like under $800.00. You could get a phase 1 EJ253 from a 05 Impreza 2.5i or Legacy 2.5i the revised EJ253 from a 06-11 impreza

I'm not trying to start a pissing match. I'm simply trying to provide a fact here, and you blatantly call me wrong. The EJ253 is a MAF regulated engine found in the '99 RS, 05+ RS. The EJ251 is a MAP regulated engine found in 2000-2004 RS. Either engine will work just fine in the OP's case, but if an EJ251 is picked up, the intake manifold will have to be swapped with the manifold from the original engine in his '99 RS, the EJ253. The block and heads are basically the same in these engines, major difference being the way intake volume is calculated, MAF vs. MAP.
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Old 01-12-2011, 10:35 AM   #12
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I'll help clear this up... and if not... Fix wikipedia:

EJ25

* Displacement: 2457 cc
* Bore: 99.5 mm
* Stroke: 79.0 mm
* Compression Ratio: 9.5:1 - 10.0:1 Naturally Aspirated
* Compression Ratio: 8.0:1 - 9.5:1 Turbo
* Fuel Delivery multi point fuel injection

[edit] EJ25D

The EJ25D has demonstrated leaking head gasket issues on occasion. There were (at least) two variations of the EJ25D sold in the US market. The engine was introduced in 1996 in the Legacy 2.5GT and LSi and Legacy Outback. That version of the engine used HLA heads, was recommended to be run on 91 octane fuel, had lower power and torque ratings than the later '97-99 EJ25D, and was only offered with an automatic transmission. In 1997 a revised engine was introduced that used heads with shimmed bucket lifters (versus the HLAs), was designed to run on 87 octane fuel, and was available with either a manual or automatic transmission.

DOHC (1996) - SAE - 155 hp (116 kW) @ 5600 rpm
140 ftlbf (190 Nm) at 2800 rpm
DOHC (1997–1999) - SAE - 165 hp (123 kW) @ 5600 rpm
162 ftlbf (220 Nm) at 4000 rpm

Usage

* Impreza 98
* Legacy/Outback 96~99
* Forester 98

[edit] EJ251
Flat four EJ251

SOHC Intake volume is calculated by the use of a MAP sensor, unlike the EJ253 which uses a MAF sensor. Compression ratio is 10.0: 1.

Power ISO: 123 kW (165 hp) @ 5600 RPM
226 Nm (167 ftlbf) @ 4000 rpm

Usage:

* Impreza 2.5RS, 2.5TS 99-04 (US)
* Impreza Outback Sport 02-04 (US)
* Forester 99-04 (US)
* Legacy 00-04 (US)
* Outback 00-04 (US)
* Baja 03-05 (US)

[edit] EJ252

SOHC Power ISO 115 kW (156 hp) Usage:

* Legacy/Outback 00
* Forester 00

[edit] EJ253

SOHC - ISO 173 hp (129 kW) @ 5600 rpm, 166 ftlbf (225 Nm) torque @ 4000 rpm. Intake volume is regulated by use of a MAF sensor, unlike the EJ251 which is regulated by a MAP sensor. I-Active valves (VVL intake side) on 06+ models.

* Impreza 05+
* Legacy, Outback USA 05+
* Forester 05+
* Baja 05+
* Saab 9-2x Linear 05, 06

[edit] EJ254

SOHC 16 valve Power SAE 121 kW (165 hp), 2005–present - 175 hp (130 kW).

Usage:

* Impreza RS 02~04
* Forester 04
* Legacy/Outback 02~04, 05-present
* Subaru Lagacy Lancaster RHD 1999-2003

[edit] EJ255

DOHC turbocharged, with sodium-filled valves originally designed for North American market, now sees usage in some European Imprezas and Legacies destined for Australia and South Africa. Power 230-265 hp

Usage in North America:

* Impreza: 2006–present
* Forester: 2004–present
* Legacy/Outback: 2003–present
* Baja: 2004 - 2006

Usage in the rest of the world:

* Legacy/Outback: 2007–present
* Impreza: 2006–present

[edit] EJ257

DOHC 16 valve turbo. Originally designed for the North American Impreza STI in 2004 with AVCS and DBW. The same exact shortblock as EJ255 except the EJ255 has a different domed piston vs the EJ257. The heads also have different components. Subaru of America designates the same part numbers for an EJ255 shortblock, and EJ257 shortblock with the exception of the pistons.

Usage:

* US Market Impreza WRX STi MY04~MY07 (300 hp, 293 hp (New SAE standard))
* US Market Impreza WRX STI MY08~MY10 (305 hp (New SAE standard))
* US Market Subaru Legacy/Subaru Outback MY05~MY06

* Asian, European Market Impreza WRX STi 05~present (280 hp, 40KGh/m)

* JDM Forester STI MY05~present
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Old 01-12-2011, 12:44 PM   #13
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Quote:
Originally Posted by T Wrex--OH View Post
EJ253 is a MAF regulated engine found in the '99 RS

Wrong. EJ253 Phase 1 05+ ALL N/A Subaru's, Phase 2 AVLS and internal component change ALL N/A Subaru's 06-11, Phase 3 EJ253 12'+ N/A Subaru's.
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Old 01-12-2011, 03:55 PM   #14
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I'm sorry to have started this pissing match, I'm just trying to find and EJ251 short block at this point as I have found some heads and have been all over RS25 and was hoping to get lucky over here.
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Old 01-12-2011, 04:49 PM   #15
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Well if you have to hot tank and deck the block you could buy this one:
http://www.rs25.com/forums/f177/t149...0mm-150-a.html
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Old 01-12-2011, 04:49 PM   #16
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Correction you should hot tank and deck ANY used block that hasn't been
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Old 01-12-2011, 04:51 PM   #17
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Old 01-12-2011, 05:02 PM   #18
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Quote:
Originally Posted by Instanced View Post


[edit] EJ251
Flat four EJ251

SOHC Intake volume is calculated by the use of a MAP sensor, unlike the EJ253 which uses a MAF sensor. Compression ratio is 10.0: 1.

Power ISO: 123 kW (165 hp) @ 5600 RPM
226 Nm (167 ftlbf) @ 4000 rpm

I'm just sayin'...

OP, just a question, Does your car have a MAF or MAP sensor?
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Old 01-12-2011, 05:37 PM   #19
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Quote:
Originally Posted by GEE-OTTO View Post
Well if you have to hot tank and deck the block you could buy this one:
http://www.rs25.com/forums/f177/t149...0mm-150-a.html
This block is Phase 1 EJ25D block from what I can tell and the OP doesn't want/need that. Wording is confusing on that post lol.
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Old 01-12-2011, 06:39 PM   #20
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Quote:
Originally Posted by T Wrex--OH View Post

OP, just a question, Does your car have a MAF or MAP sensor?
Or, better yet OP, "settle" this dispute once and for all and take a look at your VIN plate in the engine bay, It will have a section titled "engine type".
This way, one of us can say we were wrong, and we can find you the info/engine you need.
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Old 01-12-2011, 06:39 PM   #21
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Ebay dude!
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Old 01-13-2011, 12:09 AM   #22
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Well ****, looks like I was wrong, it is an EJ253 according to the engine plate. 1 point for T WREX! At this point, all I need is a short block though, bought a set of heads today w/ some Delta cams.

Also, the car is MAF-based. I was thinking there were MAF 251s for some reason, so negative a point for me.
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Old 01-13-2011, 12:20 AM   #23
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Quote:
Originally Posted by PowerShift408 View Post
Well ****, looks like I was wrong, it is an EJ253 according to the engine plate. 1 point for T WREX! At this point, all I need is a short block though, bought a set of heads today w/ some Delta cams.

Also, the car is MAF-based. I was thinking there were MAF 251s for some reason, so negative a point for me.
Thank you. Did you check your RS25 thread? I made a suggestion in that one.
Any phase 2 EJ25 shortblock will work. All you need to use is your intake manifold+intake tract. Hope everything goes well. You'll love a cammed RS. Trust me, I know all about it.

Gee-Otto, if you're still in this thread, we can still be internet friends.

Just know that I'm stubborn as hell, and when I KNOW I'm right, I will back my s*** up.

I won't even get into the phase 1 & 2 discussion.
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Old 01-13-2011, 12:26 AM   #24
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Quote:
Originally Posted by T Wrex--OH View Post
Thank you. Did you check your RS25 thread? I made a suggestion in that one.
Any phase 2 EJ25 shortblock will work. All you need to use is your intake manifold+intake tract. Hope everything goes well. You'll love a cammed RS. Trust me, I know all about it.

Gee-Otto, if you're still in this thread, we can still be internet friends.

Just know that I'm stubborn as hell, and when I KNOW I'm right, I will back my s*** up.

I won't even get into the phase 1 & 2 discussion.
So it has to be a phase 2 short block? I assumed that I could swap over the entire top end onto basically any EJ25x and everything would work just fine? But as we've seen, I can be wrong, I'm still a rookie to the Subaru stuff even though this is my 3rd one.
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Old 01-13-2011, 08:49 AM   #25
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As long as we can eHug im cool and Ej253 before 2005 is a mystery seeing as how it was produce until 04 in Japan. There is no way you a Ej253 in a car made in 99-03 impossible
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