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Old 08-05-2017, 03:42 PM   #151
SajmonLP
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Hello everyone, I have a question. I do not speak English very well. I have a Subaru WRX 2.5T US EJ255. I have a damaged left head (D25), right is good. I'm doing engine repairs.

What best to do? Look for a second D25 head, replace it with a Forester B25 or STi head? Can I replace the internal heads like the B25 with the Forester XT?

Can I buy a B25 cylinder head and change camshafts from D25 or valves will not fit?

Head gasket 1mm. Forged pistons 99.75mm

Thank you for your answer.
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Old 08-12-2017, 02:42 PM   #152
neg_matnik
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Quote:
Originally Posted by SajmonLP View Post
Hello everyone, I have a question. I do not speak English very well. I have a Subaru WRX 2.5T US EJ255. I have a damaged left head (D25), right is good. I'm doing engine repairs.

What best to do? Look for a second D25 head, replace it with a Forester B25 or STi head? Can I replace the internal heads like the B25 with the Forester XT?

Can I buy a B25 cylinder head and change camshafts from D25 or valves will not fit?

Head gasket 1mm. Forged pistons 99.75mm

Thank you for your answer.
You should look for another D25 head; it's easier/simpler.
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Old 02-03-2018, 02:06 PM   #153
SpreadmasterFresh
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Some good info here
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Old 06-06-2018, 12:48 PM   #154
tbirdx9
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Default EJ255 vs Ej257 short block

My friend has a 2011 WRX sedan (original owner), and he is rebuilding the engine. Attached are pictures of his old short block and a new short block he got from a certified distributor. I've spent a few hours on this thread and other forums reading up on what the differences between STI and WRX blocks are, and everyone seems to think they are the same. My question is, why is the new short block the company sent him completely open deck, while his OEM engine is clearly a semi closed deck? Is the one they sent him an STI EJ257? Both engines have the EJ25 stamp on the top, and yet they are clearly different with the decks, and even the outer rim shapes are different as shown in the pictures where I traced the lines. Someone please tell me what the heck my friend drove 3 hours to pick up when he told them what car he has and everything. Thanks in advanced.





Last edited by tbirdx9; 06-06-2018 at 12:49 PM. Reason: Picture links weren't correct
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Old 06-06-2018, 01:12 PM   #155
EVL RS-T
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There are different casting series for EJ257 (e.g. B25 703, 704, 705, etc). What you have pics for there is a Z25 306 casting... I can't find definitive info for it, but that might be a block from an NA Subaru.

https://forums.nasioc.com/forums/sho....php?t=2173848

Quote:
Originally Posted by tbirdx9 View Post
My friend has a 2011 WRX sedan (original owner), and he is rebuilding the engine. Attached are pictures of his old short block and a new short block he got from a certified distributor. I've spent a few hours on this thread and other forums reading up on what the differences between STI and WRX blocks are, and everyone seems to think they are the same. My question is, why is the new short block the company sent him completely open deck, while his OEM engine is clearly a semi closed deck? Is the one they sent him an STI EJ257? Both engines have the EJ25 stamp on the top, and yet they are clearly different with the decks, and even the outer rim shapes are different as shown in the pictures where I traced the lines. Someone please tell me what the heck my friend drove 3 hours to pick up when he told them what car he has and everything. Thanks in advanced.




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Old 06-06-2018, 01:38 PM   #156
tbirdx9
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Okay so it seems like this is a EJ 251 or EJ 253 block possibly...except the piston grooves seem very aggressive. They must have mixed up which short block he needed. What do you think?

Quote:
Originally Posted by EVL RS-T View Post
There are different casting series for EJ257 (e.g. B25 703, 704, 705, etc). What you have pics for there is a Z25 306 casting... I can't find definitive info for it, but that might be a block from an NA Subaru.

https://forums.nasioc.com/forums/sho....php?t=2173848

Last edited by tbirdx9; 06-06-2018 at 01:47 PM. Reason: Added more context
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Old 06-06-2018, 01:54 PM   #157
Delphi
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That is an AVLS EJ253 Shortblock there. Your friend either got had or bought the wrong block. Don't use it with a turbo set up.
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Old 06-06-2018, 02:03 PM   #158
tbirdx9
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It seems so...the company definitely messed up and got him the wrong one. He won't be using it for sure. The closest thing I found to the Z25-306 casting numbers was this listing on ebay: Z25-303 from a 2008 Outback, pic below. He won't be too happy when I tell him, thanks everyone.


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That is an AVLS EJ253 Shortblock there. Your friend either got had or bought the wrong block. Don't use it with a turbo set up.
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Old 07-10-2019, 06:43 AM   #159
Garnet Suss
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Default Whaaaaat? Does that mean my '06 OBXT has the same short nlock as the EJ257?

Whaaaaat? Does that mean my '06 OBXT has the same short block as the EJ257 and can basically bolt on better heads and a larger turbo without needing to first beef up the short block internals?

Quote:
Originally Posted by sponaugle View Post
Indeed this exact topic, and said measurements came up in this thread:
http://forums.nasioc.com/forums/show...t=EJ255&page=2

a few months ago.. In that thread I posted the following:








My numbers are slightly different then the ones you got. For my 06 WRX EJ255 piston, the dish measured slightly larger. Both pistons were new, and I used a similiar technique. I still have the pistons so I could measure them again.

As for the head volumn, I have measured several new and used EJ257 heads and they always meaure out at 56-57ccs. I believe a few other builders have measured the same range, but it is difficult to be precise given the lack of measureing standards and conditions.

My resulting compression ratio values are similar, but not the same.

The head gasket thickness I used is .60mm, which is .0236". This is based on measuring several different used gaskets, and using the caliper to compress the gasket in a way similiar to the conditions it is clamped in.

If I were to adjust the piston dish to be the same, the numbers would be almost identical.

It is important to correct one thing:

It is not proper to catagorize these pistons as EJ255 pistons. There are two variants of the EJ255 shortblock. The first EJ255 shortblock used in the 05/06 Legacy GT, 04/05 *CORRECTED* Forester, and the Turbo Baja is identical to the EJ257 shortblock.

Thus you want to avoid grouping all EJ255 motors together, as the statements saying such would be incorrect. The correct way would be to either indicate the SB number 10103xxyyy.

Jeff
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