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Old 03-11-2006, 06:37 PM   #1
ROC pit-bull
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Join Date: Aug 2004
Chapter/Region: Tri-State
Location: rochester ny
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1995 legacy L
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Default Ej257 Build

I need a little advice on how to build this engine. I'm realy poor, but when i get an opportunity to get something to get closer to finishing this engine i do it.

Before i get too invested in something i want to make sure i do this the right way.

I was thinking of making this whole block a N/A motor. But i have gotten all turbo internals for the engine. And i want to get heads which will be able to handle a turbo. If one day i can get eneough money to put all of what necesary to do that.

I would like to know which direction to go reguarding the heads i should get?
should i go with ej257 heads? would that be able to run NA (i'm sure it could but i don't know for sure)?

Should i go with the 1999 legacy, or the 98 rs, V7 dohc heads?

I know i asked alot of questions here but i just want to make sure i know fully what i'm going to need to look for...


thanks

scott
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Old 03-11-2006, 06:48 PM   #2
keaniegenie
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Quote:
Originally Posted by ROC pit-bull
I need a little advice on how to build this engine. I'm realy poor, but when i get an opportunity to get something to get closer to finishing this engine i do it.

Before i get too invested in something i want to make sure i do this the right way.

I was thinking of making this whole block a N/A motor. But i have gotten all turbo internals for the engine. And i want to get heads which will be able to handle a turbo. If one day i can get eneough money to put all of what necesary to do that.

I would like to know which direction to go reguarding the heads i should get?
should i go with ej257 heads? would that be able to run NA (i'm sure it could but i don't know for sure)?

Should i go with the 1999 legacy, or the 98 rs, V7 dohc heads?

I know i asked alot of questions here but i just want to make sure i know fully what i'm going to need to look for...


thanks

scott

If it's made for turbo, make a turbo. Even if you're poor, you can build it for cheap if you get the right parts.

The cheapest heads that will work are WRX heads. The cams are somewhat restrictive, so look for STI cams for a good price. Both are easy to come across since WRX and STi owners are always upgrading. You may be able to get both for around $500.

Look for a used VF39 or VF22 for a turbo. Tons of VF39's since all the STI guys are upgrading. Lots of VF22's since they've been out for a while.
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Old 03-11-2006, 07:22 PM   #3
ROC pit-bull
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I'm not in a hurry to quickly slap everything togather. I'm trying to avoid as much time away from the machinist. I'm sure there's some machining that needs to be done if i were to go with the wrx heads..
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Old 03-11-2006, 10:33 PM   #4
Rally_wgn
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Roc its likely no machining will be required. The EJ series motors are suprisingly compatible across diffrent years and displacements.

One example the frankenstien hi compression hybird. You take the heads from a 2.2L motor, preferablly a pre-'97 and slap them on a EJ25 2.5L Block, the newer phase II is prefered. and you end up with a 11:1 or so compression ratio powerhouse with no rewiring and very little cash. I know this isnt neccesarily your intent but it is a remarkable example of the flexibility of the EJ series.

If i were you i would head down to the conversion forum and do some searching and browsing you will be amazed at the variations available. I would also search here under Matt Monson's name and check out his contributions on the NA side.

Im a big fan of the NA formula but with keaniegenie that if you have a EJ257 with stock internals you could source a lot of stuff used and build a nice, powerful turbo motor for not a lot of cash and it would have a lot of upgrade potential down the road.

I think you'll find the NA route would require a lot more money for the same power. I believe Mr Monson or some other NA guru type is building an NA motor using the EJ257 short block and they have a thread either here or in the conversion forum. Hope this helps, if I said anything wrong in here I hope someone corrects it soon, I would hate to be misleading.
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Old 03-12-2006, 11:44 AM   #5
JonofScio
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if you went n/a with the stock internals and planned to turbo later, it would not really have much oomph to it because of the low compression.

if you want, I suggest turbo. and as far as heads, you need to use whatever style of head your engine management in the car uses. if it is SOHC, you'll need SOHC heads. if it's coming out of a 2.5RS with a DOHC motor, use those heads.

Any 2.5L head will still give you a very close to stock STi compression. and you won't need to rewire your ecu. but then again, if you want to turbo it reliably, you'll need engine management, so depending on which one you go with, choosing the heads could possibly not matter at all.
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Old 03-12-2006, 07:20 PM   #6
ROC pit-bull
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As far as the internals i have for the ej257 block it goes i have con rods (steel) from cobb. forged aluminum turbo pistons (cobb), titanium pins (cobb), blue printed and coated rod, and main bearings, and subaru ring set.

from what i read earlier, I can just bolt on my 2.2 soch heads and not have to change ecu or wiring?
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Old 03-13-2006, 10:43 AM   #7
EastsideLegacy
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I think if you bolted the 2.2L heads with stock DOHC intake manifold, from N/A 2.5L motor, with the EJ257 shortblock you may not need to change the wiring in your Leggy. . . Thats if its a 2.5L DOHC N/A.

But in your profile it says you have a legacy L so there should be some wireing required mabe for EJ257 shortblock.

But i recall that you can put the 2.5 DOHC N/A intake manifold on a 2.2L SOHC and get better flow but you have to use old injectors or somthin of that sort....

Correct me if im wrong..
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Old 03-13-2006, 02:48 PM   #8
swapstar
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how are cams restrictive. cams are not restristive, heads and valvetrains are restrictive.
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Old 03-13-2006, 03:16 PM   #9
ROC pit-bull
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would it require some wiring because some of the newer intake manifolds have the drive by wire? would i have to rewire if the intake manifold was a drive by cable?
I was also wondering what could i take off of the block and reuse on the 257 block? ie... water pump, oil pump ect.

Yes it is a 95 legacy 2.2 awd sohc

scott
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