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Old 05-08-2001, 11:25 AM   #1
Farfrumgerman
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Question Trey? update on phaseI/II rib marks???

I was exploring a archived thread concerning PhaseI / PhaseII "hybrid" engines... from June 2000 - started by Trey.

Has anyone come up with a solid answer? My '98 GT has the 1 rib on the block - is it a phaseII or no? can I look at the tranny or something to confirm?

I hope it is!! it is in great shape - I run the hell outta it, 59K mi, and only eats 1/3 qt of oil between every oil change....

anyone...anyone... bueller....

thanks,
Chad
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Old 05-08-2001, 03:30 PM   #2
Farfrumgerman
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TTT - - and soooooo soon

common - someone has to know!?

pleeeaaassse
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Old 05-08-2001, 03:35 PM   #3
8Complex

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I'm pretty sure that was the definitive answer. Phase II's had 1 ridge while Phase I's had 2.
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Old 05-08-2001, 05:58 PM   #4
Cobb Tuning
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Originally, we thought that all Phase 1 blocks had 2-ridges, and the Phase 2 blocks only had one.

Unfortunately, during our regular engine building duties we've found that Subaru has mixed and matched a few blocks, particularly in '98 when the changeover occured. They'd use Phase 2 cases machined to accept Phase 1 cranks and thus, rods.

That is extremely rare though. If you have 1 ridge, I would suspect it's a Phase 2 block. MY98 is a weird year though, Subaru was making quite a few changes so we never know exactly what we're going to deal with when we get our hands on one of those engines.

Thanks,
Trey
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Old 05-08-2001, 06:22 PM   #5
8Complex

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Trey - Got something I can measure in there to tell the difference? Crank dia. or something?
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Old 05-08-2001, 06:28 PM   #6
Safir
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where are said ribs located? we have a 98 RS around here and we are trying to figure it out. I understand what you said about things changing a lot in 98 but it'd be nice to have an idea.
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Old 05-09-2001, 11:11 AM   #7
Farfrumgerman
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Talking

Thanks for the info!!

I am stoked that my GT has what most likely is a phaseII!!

Safir - - The ribs are located (looking at the engine from the front) on the left (pass.) side, top & front of the block -(not the head). Look for the EJ25 stamping, then look a little left and more forward from there - the rib(s) will be parralel to the front of the car - and are .75-1" long. they are raised off of a round smoothed area of the block 1" in Dia.

thanks again!
Chad
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Old 05-09-2001, 11:17 AM   #8
Joel Gat, 1.8L
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Hello,

See my post in the thread on "calling all '98 owners" or something like that. I still think at least as accurate as the marks on the block are the number of bolts to the tranny. The block itself is a phase-II block if it is designed for a 7-bolt tranny.

Sure, there may be some internal differences and I guess you can't be sure without looking at the crankshaft, but still, just crawl around and count the attachment points - is the starter mounted on a stud that comes from the engine, through the tranny or is it attached to the tranny itself off a tranny-stud?

there are several ways to test this visually...

Joel
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Old 05-09-2001, 01:32 PM   #9
SubyTechMaster
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I have both EJ25 Phase I and Phase II engines here and upon inspection they both have a single rib as desrcribed. Your best bet is to count Bellhousing bolts. Regardless of which heads it has (single or double cam), a Phase II case will have an 8-bolt bellhousing.
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