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Old 03-07-2009, 07:20 PM   #1
mt72
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Default Wrx 2.5L short block with STI internals CP 99.5 bore mandley rods ?

Can I use a wrx 2.5L engine for my build ?

I have all STI spec internal except crankshaft but it's way cheaper to get a 2.5L from wrx here ?

Let me know if this is possible

I am on a budget just trying to save a bit of $$$

Thanks
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Last edited by mt72; 03-07-2009 at 08:17 PM.
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Old 03-07-2009, 07:22 PM   #2
Letze
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phase 2 cranks are all forged... STi specifically offers no advantage

I'm using an EJ25D shortblock with a phase 2 crank out of an RS, STi Connecting rods/Pistons and 2.0 Heads...

With the machine shop labor to get it cleaned/honed and have everything checked out its about 800 some in parts/labor and you have to assemble it yourself.

You also have other stuff to factor in like gaskets that you'll already be doing IMO... get a 2.5 WRX, beat on it till she blows then deal with a rebuild with real internals...

Last edited by Letze; 03-07-2009 at 07:31 PM.
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Old 03-07-2009, 08:14 PM   #3
mt72
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Quote:
Originally Posted by Letze View Post
phase 2 cranks are all forged... STi specifically offers no advantage

I'm using an EJ25D shortblock with a phase 2 crank out of an RS, STi Connecting rods/Pistons and 2.0 Heads...

With the machine shop labor to get it cleaned/honed and have everything checked out its about 800 some in parts/labor and you have to assemble it yourself.

You also have other stuff to factor in like gaskets that you'll already be doing IMO... get a 2.5 WRX, beat on it till she blows then deal with a rebuild with real internals...
Well I have real internal like CP piston stock bore Mandley rods , 272 Crower cams + valve + spring + retainer .

My question is can i put all theses into 2.5 WRX short block ?
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Old 03-07-2009, 08:24 PM   #4
Letze
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In a word... Yea
Phase 2 EJ25 blocks can swap internals all day
Phase 2 EJ25 blocks CANNOT accept Phase 1 Rotating assembly it doesn't fit
Phase 1 EJ25 blocks can accept Phase 1 and 2 EJ25 rotating assembly, but cannot mix and match phase 1 and 2 rotating assembly parts (for example phase 1 crank, phase 2 rods and Vice-versa) phase 2 crank shaft uses a center thrust bearing, unless machined to have a #5 thrust bearing you MUST run a #5 Thrust bearing in the #3 slot (keep in mind this wont be entirely to spec but its tolerable
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Old 03-07-2009, 08:31 PM   #5
mt72
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Quote:
Originally Posted by Letze View Post
In a word... Yea
Phase 2 EJ25 blocks can swap internals all day
Phase 2 EJ25 blocks CANNOT accept Phase 1 Rotating assembly it doesn't fit
Phase 1 EJ25 blocks can accept Phase 1 and 2 EJ25 rotating assembly, but cannot mix and match phase 1 and 2 rotating assembly parts (for example phase 1 crank, phase 2 rods and Vice-versa) phase 2 crank shaft uses a center thrust bearing, unless machined to have a #5 thrust bearing you MUST run a #5 Thrust bearing in the #3 slot (keep in mind this wont be entirely to spec but its tolerable

could explain what is phase 1 and 2 ? i don't understand
Thanks for your help
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Old 03-07-2009, 08:44 PM   #6
Letze
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phase 1 98 and back
phase 2 99 and forward
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Old 03-07-2009, 08:54 PM   #7
mt72
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Quote:
Originally Posted by Letze View Post
phase 1 98 and back
phase 2 99 and forward

Hahaha thanks Mate !!! the engin will be 2005-2006 or something like that

Will the 6 speed tranny will bolt right up ?

I am glad you clarified those for me !!!
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Old 03-07-2009, 09:00 PM   #8
Letze
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All EJ series motors/transmissions will bolt up...

Phase 1 Blocks have 4 Mounting Bolts and the second starter bolt has to be tapped in order to mount

Phase 2 Blocks have 6 Mounting points (1 of which is the second starter mount hole)

As long as you have the associated Clutch/Pressure Plate/Flywheel/starter for your transmission you're fine. (this is for hydro clutch users only, if you're still on "Ye old Cable Clutch" its time to upgrade)
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Old 03-07-2009, 09:04 PM   #9
mt72
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Quote:
Originally Posted by Letze View Post
All EJ series motors/transmissions will bolt up...

Phase 1 Blocks have 4 Mounting Bolts and the second starter bolt has to be tapped in order to mount

Phase 2 Blocks have 6 Mounting points (1 of which is the second starter mount hole)

As long as you have the associated Clutch/Pressure Plate/Flywheel/starter for your transmission you're fine. (this is for hydro clutch users only, if you're still on "Ye old Cable Clutch" its time to upgrade)
I have 06 STI with 6 speed tranny ... here in canada you can get a 06 wrx 2.5L longblock for 800 $ . I was think if only I could build this engin that would be a cheap road for the same benefit .

Are the 06 WRX engin call EJ257 ?
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Old 03-07-2009, 09:12 PM   #10
Letze
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STi's are 257's
WRX's LGT's and FXT's are 255's
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Old 03-07-2009, 09:26 PM   #11
mt72
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Quote:
Originally Posted by Letze View Post
STi's are 257's
WRX's LGT's and FXT's are 255's
Thank you for your great help it's was very instructive
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Old 05-26-2009, 12:41 AM   #12
TaurusMcRae007
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So would the EJ257 or EJ255 bolt up to a 5MTX from a '99 Legacy GT, that was previously mated to an EJ25D? At what point must you also purchase an ECU?
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