2.5 STi block w Forged Pistons (pics)

MJU1983 · 04-06-2004, 01:52 AM

Thought these were neat pictures that I took so I thought I would post them.

-Mike

* Registered users of the site do not see these ads.

joebud · 04-06-2004, 01:58 AM

what's the price on that bad boy?

volkl23 · 04-06-2004, 02:20 AM

so shiny and clean!

wRxbeater11 · 04-06-2004, 10:31 AM

Hmm, Mikey mine are different Por que?

-Melo

F22-Raptor · 04-06-2004, 10:33 AM

What pistons are those CP?

WRXpkr · 04-06-2004, 11:03 AM

cp in a 2.5 block?

F22-Raptor · 04-06-2004, 01:34 PM

Quote:

Originally posted by WRXpkr
cp in a 2.5 block?

I just was wondering since I have CP going in my 2.5 block currently.

RiftsWRX · 04-06-2004, 04:59 PM

Hey Mike, is that my motor?

I was going to say, I had forgotten to ask you guys to snap pictures hehe

Jorge (RiftsWRX)
www.ProjectWRX.com

Achilles38WRX · 04-06-2004, 05:04 PM

almost to pretty to use.....nah!

MJU1983 · 04-06-2004, 05:29 PM

Quote:

Originally posted by RiftsWRX
Hey Mike, is that my motor?

I was going to say, I had forgotten to ask you guys to snap pictures hehe

Jorge (RiftsWRX)
www.ProjectWRX.com

yes sir

STiTuner · 04-06-2004, 05:32 PM

Quote:

Originally posted by F22-Raptor
What pistons are those CP?

yup, they sure look like CP's

the mother of all pistons !!!

Brad

mlambert · 04-06-2004, 10:13 PM

NICE jorge, finally you go with the good stuff

RiftsWRX · 04-06-2004, 11:37 PM

Quote:

Originally posted by mlambert
NICE jorge, finally you go with the good stuff

Heh, thanks! Hopefully tommorow I'll have the last of what I need (plugs, some more header wrap, and the up-pipe to the header back from the welder), then she's ready to go in.

Let's do it all over again!!!

Jorge (RiftsWRX)
www.ProjectWRX.com

Wombat North · 04-07-2004, 12:21 AM

Jorge

I guess we will see how out of round the stock liners go.

What rods did you end up with?

RiftsWRX · 04-07-2004, 03:20 PM

Stock USDM rods. I'm really not looking at pushing this. Honestly if the motor ever saw more then 17 PSI by redline I'd be surprised.

Jorge (RiftsWRX)
www.ProjectWRX.com

big_adventure · 04-07-2004, 04:26 PM

Quote:

Originally posted by RiftsWRX
Stock USDM rods. I'm really not looking at pushing this. Honestly if the motor ever saw more then 17 PSI by redline I'd be surprised.

Jorge (RiftsWRX)
www.ProjectWRX.com

yeahhhhh, riiiiiight.

RiftsWRX · 04-07-2004, 04:33 PM

Quote:

Originally posted by big_adventure
yeahhhhh, riiiiiight.

That's my story, and I'm sticking to it! heh

Jorge (RiftsWRX)
www.ProjectWRX.com

Wombat North · 04-07-2004, 05:34 PM

Quote:

Originally posted by RiftsWRX
Stock USDM rods. I'm really not looking at pushing this. Honestly if the motor ever saw more then 17 PSI by redline I'd be surprised.

Jorge (RiftsWRX)
www.ProjectWRX.com

Are pistons special built for your motor? The stock rods are tapered on the end so how did Mike get them to fit on the stock rods. Would like to see a pic of that if possible.

RiftsWRX · 04-07-2004, 05:43 PM

Quote:

Originally posted by Wombat North
Are pistons special built for your motor? The stock rods are tapered on the end so how did Mike get them to fit on the stock rods. Would like to see a pic of that if possible.

I'll let those gurus comment

.

Jorge (RiftsWRX)
www.ProjectWRX.com

totoherbs · 04-07-2004, 07:28 PM

Quote:

Originally posted by Achilles38WRX
almost to pretty to use.....nah!

Ya.... it would look nice hanging on the wall right?

Quote:

Originally posted by big_adventure
yeahhhhh, riiiiiight.

Lets start a pool... when will Jorge brake his only 17psi rule?

Good luck dude!

Are the pistons lighter then the stockers?

Crawford Performance · 04-07-2004, 07:57 PM

What is the compression ratio with that small dish?

Quirt Crawford
www.crawfordperformance.com

RiftsWRX · 04-07-2004, 08:19 PM

Quote:

Originally posted by Crawford Performance
What is the compression ratio with that small dish?

Quirt Crawford
www.crawfordperformance.com

Between the combustion chamber work, head gasket, and pistons it should be around 8.0-8.1:1.

With a stock set of WRX heads, and stock 257 gasket.. no clue. I'll let the guys at Axis chime in.

Jorge (RiftsWRX)
www.ProjectWRX.com

MJU1983 · 04-07-2004, 09:40 PM

With those pistons and our cometic head gaskets, compression ratio should be ~8.5/8.6:1

With the thinner gasket, it will be a little higher.

Talking about installing with WRX heads.

-Mike

Wombat North · 04-07-2004, 10:26 PM

Quote:

Originally posted by Wombat North
Are pistons special built for your motor? The stock rods are tapered on the end so how did Mike get them to fit on the stock rods. Would like to see a pic of that if possible.

Mike can you answer this or is it TS. Thanks

boogerwrx · 04-07-2004, 10:50 PM

The pistons are designed specially for the ej257 motor. They use the piston dish of our 2.35, which with unmodified wrx heads and Cometic gaskets yeilds about 8.5-8.6:1. Jorge's heads were slightly modified, so I would say his final cr will be around 8.0-8.1:1.

When using stock ej257 gaskets, you can figure on about 8.8-8.9:1 cr with wrx heads.

The pistons themselves have a modified compression height, so the bottom oil control ring does mount slightly lower than it does on the stock piston. All 3 rings were lowered a bit to give more crown and a thicker top ring land for strenghth. The pistons should be able to take more than 30psi without hassles, but I doubt the stock rods will take much more than 24-25psi and still stay together. We usually suggest that the ej257 block not see more than 24psi if you want it to live for more than a couple months.

Ron

04-06-2004, 01:52 AM	#1
MJU1983 Scooby Specialist Member#: 14364 Join Date: Jan 2002 Chapter/Region: MWSOC Location: Saint Louis, MO Vehicle: 2003 WRX, '06 Armada 05 Vette & 05 STi (sold)	2.5 STi block w Forged Pistons (pics) Thought these were neat pictures that I took so I thought I would post them. -Mike * Registered users of the site do not see these ads.

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04-06-2004, 11:03 AM	#6
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RiftsWRX Scooby Guru Member#: 6124 Join Date: Apr 2001 Chapter/Region: MWSOC Location: Glendale Hts, IL, USA Vehicle: 2000 NFR AP1 S2000 '07 Honda FIT sport (5MT)	Hey Mike, is that my motor? I was going to say, I had forgotten to ask you guys to snap pictures hehe Jorge (RiftsWRX) www.ProjectWRX.com

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mlambert Scooby Guru Member#: 13831 Join Date: Jan 2002 Location: 99 problems but a bitch aint 1	NICE jorge, finally you go with the good stuff

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Wombat North Scooby Specialist Member#: 21267 Join Date: Jul 2002 Location: Eats, roots and then leaves Vehicle: STI, EWG 8cm Green UTEC/ECUtek/WI & SD tune	Jorge I guess we will see how out of round the stock liners go. What rods did you end up with?

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RiftsWRX Scooby Guru Member#: 6124 Join Date: Apr 2001 Chapter/Region: MWSOC Location: Glendale Hts, IL, USA Vehicle: 2000 NFR AP1 S2000 '07 Honda FIT sport (5MT)	Stock USDM rods. I'm really not looking at pushing this. Honestly if the motor ever saw more then 17 PSI by redline I'd be surprised. Jorge (RiftsWRX) www.ProjectWRX.com

04-07-2004, 07:57 PM	#21
Crawford Performance NASIOC Vendor Member#: 42075 Join Date: Aug 2003 Chapter/Region: SCIC Location: Oceanside	What is the compression ratio with that small dish? Quirt Crawford www.crawfordperformance.com

04-07-2004, 09:40 PM	#23
MJU1983 Scooby Specialist Member#: 14364 Join Date: Jan 2002 Chapter/Region: MWSOC Location: Saint Louis, MO Vehicle: 2003 WRX, '06 Armada 05 Vette & 05 STi (sold)	With those pistons and our cometic head gaskets, compression ratio should be ~8.5/8.6:1 With the thinner gasket, it will be a little higher. Talking about installing with WRX heads. -Mike

04-07-2004, 10:50 PM	#25
boogerwrx Scooby Specialist Member#: 13448 Join Date: Dec 2001 Vehicle: 2002 wrx wagon silver	The pistons are designed specially for the ej257 motor. They use the piston dish of our 2.35, which with unmodified wrx heads and Cometic gaskets yeilds about 8.5-8.6:1. Jorge's heads were slightly modified, so I would say his final cr will be around 8.0-8.1:1. When using stock ej257 gaskets, you can figure on about 8.8-8.9:1 cr with wrx heads. The pistons themselves have a modified compression height, so the bottom oil control ring does mount slightly lower than it does on the stock piston. All 3 rings were lowered a bit to give more crown and a thicker top ring land for strenghth. The pistons should be able to take more than 30psi without hassles, but I doubt the stock rods will take much more than 24-25psi and still stay together. We usually suggest that the ej257 block not see more than 24psi if you want it to live for more than a couple months. Ron