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Are all 8 bolt EJ25 blocks Phase 2?


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11 replies to this topic

#1 franklinstower

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Posted 24 January 2013 - 02:18 PM

i just realized my EJ25 block for my frank build has the 8 mounting holes. The vin on the block is:4S3BG6856W7655075 - the VIN indicates it is a 1998 block, but doesn't the 8 bolt holes indicate this is one of the factory hybrids with the phase 2 block (larger rod bearings and thrust bearing moved to #3) with ph1 square dished pistons and ph1 dohc heads?

#2 987687

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Posted 24 January 2013 - 03:27 PM

I guess it's possible that late model year 98s have a phase2 block. Do you know the manufacture date of the car the 2.5 came out of?

#3 GeneralDisorder

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Posted 24 January 2013 - 03:28 PM

Maybe. Phase-II is larger rods and #5 thrust. Pull the pan and look.

GD

#4 franklinstower

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Posted 24 January 2013 - 04:49 PM

Maybe. Phase-II is larger rods and #5 thrust. Pull the pan and look.

GD


Pan is off, engine is on my bench, what exactly am I looking for?

#5 987687

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Posted 24 January 2013 - 05:15 PM

Hmmmm. Interesting. So I was just out in the garage. The original 2.5 from my 98 legacy is an 8 bolt bellhousing. Unfortunately I don't know the manufacture date of that car since I've sold it, but iirc it was early 98. I know for sure it had a 4 bolt bell housing, though. I can't figure out how to see where the thrust bearing is... All I can see from the bottom are crank and rods.

#6 franklinstower

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Posted 24 January 2013 - 05:16 PM

Maybe. Phase-II is larger rods and #5 thrust. Pull the pan and look.

GD


Pan is off, engine is on my bench, what exactly am I looking for?

#7 grossgary

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Posted 24 January 2013 - 05:24 PM

No reason for alarm, you have exactly what you thought you had - a 1998 Phase I EJ25.

doesn't the 8 bolt holes indicate this is one of the factory hybrids with the phase 2 block

No.

Re: Are all 8 bolt EJ25 blocks Phase 2?

No.

Either way it doesn't matter and will work...but I guess you want performance and want to know what kind of compression/power you're making and want it to be more of those.

#8 GeneralDisorder

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Posted 24 January 2013 - 05:29 PM

Pull off a rod cap and measure the rod journal diameter.

GD

#9 franklinstower

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Posted 24 January 2013 - 05:33 PM

Pull off a rod cap and measure the rod journal diameter.

GD


54 ph 2, 48 ph 1?

#10 franklinstower

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Posted 24 January 2013 - 05:42 PM

No reason for alarm, you have exactly what you thought you had - a 1998 Phase I EJ25.

No.

No.

Either way it doesn't matter and will work...but I guess you want performance and want to know what kind of compression/power you're making and want it to be more of those.


I just found this on the Forester forum posted by Ferret:

"The phase has to do with the crankshaft thrust bearing placement ( moved from center to rear ), changes to the internal oil passages, coolant passage shapes changed and 8 bolts between the transmission and the engine.

It has been loosely thrown around that phase II was SOHC only. Not true. I have a Subaru Tech Reference manual that describes this in detail."


As you state, it doesn't really matter to me, except for my own knowledge and the fact of it being a Ph1 or Ph2 block. I like the idea of the stronger internals too!

#11 GeneralDisorder

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Posted 24 January 2013 - 05:48 PM

52mm vs. 48mm

GD

#12 franklinstower

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Posted 29 January 2013 - 02:36 PM

FYI - I also found this out: Phase 1 ej25 blocks had two ridges next to the "japan" by the #1 Cylinder, Phase 2 blocks have a single ridge at that location.

Phase 2 - Single Ridge:
Posted Image

Phase 1 - Double Ridge:
Posted Image

These two blocks both are stamped W in the Vin on the side of the block.

Good information for anyone else trying to ID whether they have an early Phase 2 or Phase 1 block.

I assume since these were both out of 1998 Legacy outback wagons - the Phase 1 block has the early crank and the Phase 2 uses the updated crank. But they both have the the phase 1 pistons and heads.

Paul




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