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Old 06-12-2006, 09:12 PM   #1
93L-RS
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Default True or False: Early EJ18's had JDM STI cranks and rods

I seem to remember reading somewhere that the 1993 Ej18's (1.8L) came from the factory with STI cranks and con rods. Is there any merit to this? If so, did it continue past '93? IIRC, it was either Subachad, Matt Monson or Storm that said this.
If i have a '93 crank and a '95 crank sitting side by side, how do I tell if one is forged (STI)?
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Old 06-12-2006, 09:22 PM   #2
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I have never heard of this, but it would be cool if it were true, I have a 93 1.8 sitting in my garage.
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Old 06-12-2006, 11:00 PM   #3
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I heard the same thing. I think this actually comes from Mike Shields SPD site.

P.S. www.uniquemotorsports.com is coming back online, I'm uploading the site now.
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Old 06-13-2006, 03:52 AM   #4
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I'd like to find out the true story to this. Anyone have any ideas where to find out?
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Old 06-13-2006, 10:25 AM   #5
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Yes its true. ALL early blocks had the same internals. JDM and USDM EJ18, early EJ20, EJ22 na and EJ22t all the same goodies. All cranks are forged.
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Old 06-13-2006, 10:48 AM   #6
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Quote:
Originally Posted by Scoobie Steve
Yes its true. ALL early blocks had the same internals. JDM and USDM EJ18, early EJ20, EJ22 na and EJ22t all the same goodies. All cranks are forged.
What Steve wrote above is true, but calling them the same as STi cranks is untrue. The first 4-5 years that STI was around, it was different than it is today. Stock vehicles and engines were taken off the production line and sent over to STI for hand blueprinting. There was no difference to the cranks when compared to a WRX or an Ej18, for that matter. But the STi cranks were knife edged, dynamically balanced with rods and flywheel, and then the engine was assembled, with forged pistons and the hand ported numbered heads. The cranks were also signed. I think I have pictures of my signed crank somewhere in my directory. I will see if I can find them.
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Old 06-13-2006, 11:02 AM   #7
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Mike is good for old school random facts like that.
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Old 06-13-2006, 12:34 PM   #8
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from what I've been told and seen pics of the old EJ18's 93-94 had STi cranks and rods as well as upper ("dogbone") engine mount...
I know mine had the dogbone and guess I need to crack open the old block and find out what's really inside...
what Matt said I know to be true with the old STi RA internals...
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Old 06-13-2006, 01:59 PM   #9
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Well,
wouldn't it still be more correct to say that STi's used a standard production crank than to say that Ej18's got STi cranks? I know it's just a question of terminology, but if we want to be correct about it that's what happened...
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Old 06-13-2006, 02:00 PM   #10
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Quote:
Originally Posted by Matt Monson
Well,
wouldn't it still be more correct to say that STi's used a standard production crank than to say that Ej18's got STi cranks? I know it's just a question of terminology, but if we want to be correct about it that's what happened...
yeah, that would make more sense...but who know's for sure that the STi's didn't get a little bit of massaging...?...
anyone have an old school STi (not RA) crank that they can take pics of to compare?...weight would be a good factor too...
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Old 06-13-2006, 02:15 PM   #11
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I do have an STI crank at home. It's from an RS-RA Legacy, but it's still an STi crank. This crank has been massaged for sure, and like I said, it's signed in Japanese. I compared it to my standard Ej20G crank and there were differences. I'll see what I can do for pictures...
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Old 06-13-2006, 03:06 PM   #12
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RS-RA...was that not the RA of the legacy's when they were used for rally...?...
that would make it massaged like any other sti RA...we know those were balanced by hand...

was your EJ20G from a baseline turbo or sti ?
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Old 06-13-2006, 03:18 PM   #13
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I guess we need to do some more digging. I was always under the impression that both STi and STi-RA engines were massaged, and only the standard WRX and WRX-RA's were not. My Ej20G was a standard auto engine from a '93 Legacy GT. The RS-RA was the only STi variant back in '90-93 before the WRX's came out.

I have also been trying to figure out when they stopped numbering the heads. The catch is that the numbers are behind the exhaust cam gears, and unless someone pops their engine, they don't ever go into the engine that deep. Even for a timing belt change, they aren't going to take off that gear where they could see the numbers...
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Old 06-13-2006, 04:46 PM   #14
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Quote:
Originally Posted by 93L-RS
I seem to remember reading somewhere that the 1993 Ej18's (1.8L) came from the factory with STI cranks and con rods. Is there any merit to this? If so, did it continue past '93? IIRC, it was either Subachad, Matt Monson or Storm that said this.
If i have a '93 crank and a '95 crank sitting side by side, how do I tell if one is forged (STI)?
Well, I might be able to help out.

Take a look at the EJ18 rods and crank:

Crank



Rods



There are a couple of things you can tell from these sheets:

As far as the crank goes, the AA031 was superceded by the AA080, then the AA081. Given the break out, it looks like AA081 is a very new update, as up to the 97MY came with the 080. Also notice that for the very first set of production for MY93 (June 92-Jan 93), the AA080 is the final superceding part number. Usually if there is a new crank , it would be usable in all of the previous configs. It is possible this is a data error, as I have seen this mistake before (meaning you could only order the AA081 now).

I will look in the JDM catalog and see what the STI crank number is.

It is also interesting to note that the crank is the same one used in the 94,95 and 96 EJ22.

As for the rods, the AA041 is superceded by the AA042 and AA051. However in mid MY 97, the rods went to a new part, the AA140. Given that this is not listed as a supercede, I suspect there was a change in the piston as well.

Again, I will check the Japanese catalog and see what the 93 STI had.

Cheers,

Jeff Sponaugle
PDXTuning.com
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Old 06-13-2006, 05:01 PM   #15
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funny the aa031 isn't showing superceded by the aa081 now...still shows aa080...
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Old 06-13-2006, 05:34 PM   #16
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sponaugle to the rescue...
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Old 06-13-2006, 05:40 PM   #17
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so, will those numbers be on the crank?
The dilemna I'm having is this: I have my old '93 EJ18. I also have two "newer" '95 EJ18's.
I'm building a 1.8 for boost. Is it advantageous to take the '93 crank and rods and dump them into the '95? Either way, the motor is getting a full rebuild (bearings, seals, valves, etc. etc.)
The '93 is not in the best condition. I had a hard time getting the motor and tranny apart when i did the 2.5 swap. I wasn't at all gentle with the B.F.H., and the block is pretty much toast (on the outside, anyway)
The '95 is in decent shape on the outside, so I wanted to use the '95 block, '93 internals, if that gives me any added durability.
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Old 06-13-2006, 05:58 PM   #18
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Quote:
Originally Posted by Homemade WRX
funny the aa031 isn't showing superceded by the aa081 now...still shows aa080...
I confirmed that on the JDM Impreza 2.0Ls, the AA080/AA081 was used.
It was used on the Version 4 and 5 EJ20K, the Version 3-Version 6 STI and STI RA, as well as the S201 and 22B.

It is possible however that an early 93 1.8 would have the older AA031, not the newer AA080/81.

As for the rods:

The 41/42/51 rod was used in the version 2 STI, but was superceded by the AA150 very quickly. All of the Version 3 and Version 4 has the AA150. Version 5,6, and 7 had 210/240, which is the current 'JDM STI' rod as well as the same rod used in the USDM STI.

So, it looks like the rods you have from the 93 or 95 are not the same as the JDM STI ones.

Jeff
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Old 06-13-2006, 06:06 PM   #19
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So this begs the question, how could they use that crank on the v5-v6 engines if they were phase II with an end thrust bearing?
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Old 06-13-2006, 06:23 PM   #20
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Quote:
Originally Posted by sponaugle
I confirmed that on the JDM Impreza 2.0Ls, the AA080/AA081 was used.
It was used on the Version 4 and 5 EJ20K, the Version 3-Version 6 STI and STI RA, as well as the S201 and 22B.

It is possible however that an early 93 1.8 would have the older AA031, not the newer AA080/81.

Jeff
By this, it would appear that rods don't really matter which year they come from, and I would be better off using the AA080 crank?
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Old 06-13-2006, 07:25 PM   #21
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so my MY94 1.8 shows AA080...

does that mean its thesame as the forged JDM?
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Old 06-13-2006, 08:11 PM   #22
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Quote:
Originally Posted by Matt Monson
So this begs the question, how could they use that crank on the v5-v6 engines if they were phase II with an end thrust bearing?
You took the words out of my mouth, Also I question the ver5-7 rods all being the same. It would be great if they are but I have a feeling Ver 7 got the bolt style instead of the older Ver 5/6 stud rods.
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Old 06-13-2006, 08:48 PM   #23
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pulled some numbers off of the '93 crank and rods. Don't know if they mean anything....
Crank: CBBCC IIII
below that, it reads: 822552 L

Rods: one reads: AGD GD44
another reads: AGI GI44
mean anything?
Tomorrow I'll have the '95 block pulled apart, and I'll see what that has to say......
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Old 06-14-2006, 12:42 PM   #24
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I hope to be able to pull apart my my94 (will check production date) EJ18 and see what she says...
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Old 06-14-2006, 02:12 PM   #25
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Very interesting thread...
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