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Old 09-18-2012, 06:20 PM   #1
twistymaster
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Default NEED HELP!! What Pistons are THESE ??AND Block if you have the time.

Bought this motor out of a local rally track shop.
Not sure what pistons are in the block or really what year and model the block is from, Paid to have it refreshed and I need to make sure that they are not low compression pistons.




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Old 09-19-2012, 10:17 AM   #2
subi400
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It looks to be a ej25D shortblock to me. 96-97 outbacks had them and then the legacy gt's 96 to 98 had them I believe including the 98 RS.

What are your plans with this motor?
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Old 09-19-2012, 10:54 AM   #3
twistymaster
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Drive it all over texas with light autoX play. Have ported sohc heads to install.


Just an na rebuild

Last edited by twistymaster; 09-19-2012 at 11:02 AM.
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Old 09-19-2012, 01:23 PM   #4
Matt Monson
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Looks phase I to me. Be sure to get the early thick head gaskets or your pistons will hit the bottom of your cylinder heads at TDC.
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Old 09-19-2012, 10:04 PM   #5
twistymaster
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WHAT GASKET ?? DERP, for witch year,
I was just going to put a 01 2.5 rs headgasket in there, Would this be a mistake ?
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Old 09-19-2012, 11:04 PM   #6
cal_look_zero
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They installed your pistons wrong... fyi. Dots forward and letters up. Not sure how much it matters at this point. They're EJ25D pistons which are dished and technically lower compression than the 251/253 pistons:



If it's a whole EJ25D short block, you have 48mm rod journals and a #3 thrust bearing; invest in a good oil pressure gauge and run a 9mm or 10mm oil pump; make damn sure the pressure relief valve is polished. EJ25Ds eat rod bearings.
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Old 09-20-2012, 12:10 PM   #7
Matt Monson
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Quote:
Originally Posted by cal_look_zero View Post
They installed your pistons wrong... fyi. Dots forward and letters up. Not sure how much it matters at this point. They're EJ25D pistons which are dished and technically lower compression than the 251/253 pistons:



If it's a whole EJ25D short block, you have 48mm rod journals and a #3 thrust bearing; invest in a good oil pressure gauge and run a 9mm or 10mm oil pump; make damn sure the pressure relief valve is polished. EJ25Ds eat rod bearings.
His pistons are installed the same way as the piston in your picture. And the rest of your post is regurgitated internet gibberish. The only good piece of your post is that he should run a 9mm (which is stock on Ej25s) oil pump...
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Old 09-20-2012, 04:51 PM   #8
cal_look_zero
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Quote:
Originally Posted by Matt Monson View Post
His pistons are installed the same way as the piston in your picture. And the rest of your post is regurgitated internet gibberish. The only good piece of your post is that he should run a 9mm (which is stock on Ej25s) oil pump...
Or maybe it's speaking from personal experience in every single core ej25d I've ever acquired having spun 1 or more rod bearings? Or making the mistake of not checking the pressure relief and seeing my oil pressure drop to almost 0?

And no, the picture I posted has the dot facing to the front of the engine. Sorry if you can't figure that out from the case casting and location of the oil galley.
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Old 09-20-2012, 09:10 PM   #9
twistymaster
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Installed wrong? Could I get a confirm on that. I have a sti pump from my hybrid that i am installing as well as a killer b oil pickup.
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Old 09-20-2012, 09:17 PM   #10
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I have a friend parting his 2000. 2.5 rs here at my house. Would it be more worth it for me to buy his engine set up, "sell this block", or should i just throw my heads on this block and let her rip? I was under the impression that all na ej25`s were 10 to 1 comp.
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Old 09-20-2012, 09:48 PM   #11
cal_look_zero
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Sorry, I was being a **** about the "installed wrong".

TECHNICALLY they're installed wrong, but the dish on those is symmetrical; I think. Some pistons have asymmetrical dish and will ruin your day if they're flipped. I would throw it up in the "Built motor" section for another opinion.

As far as CR goes, here's your breakdown:
1996 EJ25D: 10:1
EJ25D - 9.5:1
EJ251/2/3/4: 10:1
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Old 09-21-2012, 01:23 PM   #12
Matt Monson
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Quote:
Originally Posted by cal_look_zero View Post
Or maybe it's speaking from personal experience in every single core ej25d I've ever acquired having spun 1 or more rod bearings? Or making the mistake of not checking the pressure relief and seeing my oil pressure drop to almost 0?
What do you expect from a core? A core is a core because it needs to be rebuilt. The OP had this shortblock refreshed. Different than your junkyard experience...
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