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Old 07-11-2012, 04:03 AM   #1
eg33GC
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Default 207 differences

I'm sold on a 207 block, but of course the v7 is rice taxed stateside, and abroad they are still more expensive than their 5/6 counterparts. An 8 is a bit tough to find without heads,which I am not interested in.

what is the differences among the 5/6/7 207s?
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Old 07-11-2012, 06:00 AM   #2
Marnix
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V5/6 EJ207 is open deck, stock EJ18/20/22 rods and forged pistons
V7/8 EJ207 is semi-closed deck, uprated EJ207/255/257 STI rods and forged pistons

The V9/10 EJ207 has the STI rods but no longer has forged pistons
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Old 07-11-2012, 08:46 AM   #3
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V10 block is a different casting.
Also, I think OP is only interested in V5-8 short block differences, otherwise there are many more.

Also, for a pre-assembled V7 brand new factory short block sold by the dealer, there is one in NZ, I think that was posted in the EJ207 thread.
Freight shipping will also not be that expensive.
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Old 07-11-2012, 05:37 PM   #4
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Yes the V10 has beefier cylinder walls.

O and the V7-on has double cross drilled crank whereas the V5/6 has a 'normal' cross drilled crank.
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Old 07-11-2012, 06:40 PM   #5
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Quote:
Originally Posted by Vlad
V10 block is a different casting.
Also, I think OP is only interested in V5-8 short block differences, otherwise there are many more.

Also, for a pre-assembled V7 brand new factory short block sold by the dealer, there is one in NZ, I think that was posted in the EJ207 thread.
Freight shipping will also not be that expensive.
A dealer here in NZ will rape you with a razor blade embedded cactus using sand and metal shards for lube. They use the exchange rate as an excuse, even though Subaru NZ set pricing.
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Old 07-12-2012, 02:07 AM   #6
eg33GC
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The brits say the 6 is mechanically identical to the 7, which is why I was looking, but thanks for clearing that up. They sure say a lot.

How capable are the rod bolts for 7+? I am ditching the G block solely because of their rod bolts. I may as well build the g...
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Old 07-12-2012, 04:16 AM   #7
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No, the V5/6 are identical, the Brits should know that

The V7+ rod bolts are much better than the V6- bolts. The V7/8+ can do 400-450 HP (crank) on stock internals. If you replace the V6- bolts with ARP bolts and nuts they are quite strong aswell, atleast you won't have to be afraid of higher rpm's anymore. Though the rods are a bit less beefy than the V7+ rods so they can handle a bit less torque.
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Old 07-12-2012, 04:35 AM   #8
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Quote:
Originally Posted by eg33GC
The brits say the 6 is mechanically identical to the 7, which is why I was looking, but thanks for clearing that up. They sure say a lot.

How capable are the rod bolts for 7+? I am ditching the G block solely because of their rod bolts. I may as well build the g...
You might want to stay away from them. I mean ****.
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Old 07-17-2012, 01:58 AM   #9
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Quote:
Originally Posted by Marnix View Post
V5/6 EJ207 is open deck, stock EJ18/20/22 rods and forged pistons
V7/8 EJ207 is semi-closed deck, uprated EJ207/255/257 STI rods and forged pistons

The V9/10 EJ207 has the STI rods but no longer has forged pistons
I was just about to say "i thought they went hypereutectic pistons on v8+?" but then i checked my chart and it seems they all (v7+ STi) have A piston 12006AC430 (even version 9? [2005])
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Old 07-17-2012, 08:31 AM   #10
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No, I checked the piston part number, it changes with V8.
Check under PDXtuning, keyword bonanza.
There's a table that Sponaugle had for all part numbers.

Still, the V9+ are stronger than V7, because it's not about resisting the dammage of knock, it's about not causing the knock in the first place (or delaying it's appearance much more).

The whole system became much more ballanced with equal length exhaust and the long runner manifold.
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Old 07-18-2012, 02:42 PM   #11
elislider
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Quote:
Originally Posted by Vlad View Post
No, I checked the piston part number, it changes with V8.
Check under PDXtuning, keyword bonanza.
There's a table that Sponaugle had for all part numbers.

Still, the V9+ are stronger than V7, because it's not about resisting the dammage of knock, it's about not causing the knock in the first place (or delaying it's appearance much more).

The whole system became much more ballanced with equal length exhaust and the long runner manifold.
i have that chart (in excel form, not pictures) and you can clearly see at least in that chart that the piston numbers (well, it only lists the A pistons) all the STi models use the ...430 piston
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Old 07-18-2012, 03:34 PM   #12
Vlad
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One of the piston designations (not oversized for repair) is "Standard A", probably means a dimensional/weight category.
For each revision of engine there are amny piston categories.
So, to compare apples to apples, we compare standard A to standard A
With V7, (revisions A and B), this piston is
12006AB430

Vith V8, 9 (rev C,D,E,F, G), the piston is
12006AC430

Not the same part number.
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Old 07-20-2012, 01:25 AM   #13
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Here's the definitive word on the EJ207 pistons:

12006AB230 SIZE A used from April 1st 1998 until July 31st 2000 on STI V5 and V6 (forged)
12006AB430 SIZE A used from February 1st 2000 until October 31st 2002 on STI V7 (forged)
12006AC430 SIZE A used from September 1st 2002 until April 30th 2007 on STI V8 and V9 (hyperteutic cast)
12006AD610 SIZE A used from March 1st 2007 on the GRB V10 STI (hyperteutic cast)
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