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Old 06-06-2005, 03:40 AM   #1
marios03wrx
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Default What years 2.5RS's have Phase 1 center thrust cranks?

Can someone please help me w/ this? I'm trying to find out what years where phase one cranks available in 2.5RS? I have searched w/ no real straight foward answers yet. I here its June 99 and earlier, but if i could get a straight foward answer on what years 2.5RS had center thrust cranks i be happy.


Thank you
mario
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Old 06-06-2005, 05:32 PM   #2
Matt Monson
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'98...
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Old 06-06-2005, 06:09 PM   #3
allsubaru83
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^yep the '98s do.
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Old 06-06-2005, 06:33 PM   #4
Matt Monson
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And your info is correct, they went phase II mid-model year on the '99. Early production had phase I and late production phase II...
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Old 06-06-2005, 06:57 PM   #5
marios03wrx
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Alright!!!!

Thanks guys for the replies
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Old 06-06-2005, 11:17 PM   #6
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whats the diff?
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Old 06-07-2005, 12:06 PM   #7
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I hope this is right?

Phase one cranks are center thrust cranks so they have a different bearing location (in the center) when place inbetween the two block halves VS Phase two cranks are rear thrust have that bearing location in the rear. Hope that answers your question.

Now i just need to find a Phase I crank for sale.

mario
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Old 06-08-2005, 12:41 AM   #8
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so one isnt better then the other its just location?
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Old 06-08-2005, 10:51 AM   #9
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Quote:
Originally Posted by assassin_2.5
so one isnt better then the other its just location?
Do you really think they would make such a major design change and recast their blocks for no good reason? The center thrust bearings were subject to crank walk and the bottom end going bad, especially at higher power levels.
By putting the thrust bearing at the flywheel end of the block, it is more stable.

Phase II also have the bearing girdles reinforced, the piston top volume reduced by around 10cc, and the piston tops no longer clear the deck.

Phase I engines are not bad engines. I have built a number of engines with them, but if you are looking to make some serious power, or want to be able to bump the CR using thin head gaskets, or shaved heads, they are the way to go. The only way to bump CR on a phase I is to change the pistons...
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Old 06-08-2005, 11:20 PM   #10
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cool. so whats the best subby engine all and all for high n/a power capability, i'v always been a fan of the sr20det angine and wondered if subby had a rock solid contender too.
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Old 06-09-2005, 10:57 AM   #11
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If you are going to be making in excess of 240hp, there's two routes to go. Take a phase I EJ25 and have it converted to a closed deck by Cobb, TWE or Crawford, along with high CR forged pistons.

OR, get an EJ257 STI semi-closed deck engine, and do the same with the pistons. If you go the STI route, you will want to change rods as well. The STi rods are pretty heavy to be used in a high revving NA engine...
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Old 06-09-2005, 05:55 PM   #12
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whats the $$ for this kinda mods and can i use my ej25 in my 05 wagon as a base?
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Old 06-12-2005, 12:43 AM   #13
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Quote:
Originally Posted by Matt Monson
Do you really think they would make such a major design change and recast their blocks for no good reason? The center thrust bearings were subject to crank walk and the bottom end going bad, especially at higher power levels.
By putting the thrust bearing at the flywheel end of the block, it is more stable.
never heard of crankwalk problems at high HP level from the aussys or on the legacy turbo block and its at the rear because its to help NVH(thats what subaru said) plus the main journal size was increased from 48mm to 52mm

and from pics of a phase 1 to phase 2 where are the girdles because i have only noticed this on the ej257 block and no ej251 have i noticed
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