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Old 04-06-2004, 02:52 AM   #1
MJU1983
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Default 2.5 STi block w Forged Pistons (pics)

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

-Mike









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Old 04-06-2004, 02:58 AM   #2
joebud
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what's the price on that bad boy?
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Old 04-06-2004, 03:20 AM   #3
volkl23
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so shiny and clean!
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Old 04-06-2004, 11:31 AM   #4
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Hmm, Mikey mine are different Por que?

-Melo
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Old 04-06-2004, 11:33 AM   #5
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What pistons are those CP?
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Old 04-06-2004, 12:03 PM   #6
WRXpkr
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cp in a 2.5 block?
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Old 04-06-2004, 02:34 PM   #7
F22-Raptor
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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.
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Old 04-06-2004, 05:59 PM   #8
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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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Old 04-06-2004, 06:04 PM   #9
Achilles38WRX
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almost to pretty to use.....nah!
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Old 04-06-2004, 06:29 PM   #10
MJU1983
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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
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Old 04-06-2004, 06:32 PM   #11
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Quote:
Originally posted by F22-Raptor
What pistons are those CP?
yup, they sure look like CP's


the mother of all pistons !!!


Brad
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Old 04-06-2004, 11:13 PM   #12
mlambert
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NICE jorge, finally you go with the good stuff
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Old 04-07-2004, 12:37 AM   #13
RiftsWRX
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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)
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Old 04-07-2004, 01:21 AM   #14
Wombat North
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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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Old 04-07-2004, 04:20 PM   #15
RiftsWRX
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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
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Old 04-07-2004, 05:26 PM   #16
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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.
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Old 04-07-2004, 05:33 PM   #17
RiftsWRX
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Quote:
Originally posted by big_adventure
yeahhhhh, riiiiiight.
That's my story, and I'm sticking to it! heh

Jorge (RiftsWRX)
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Old 04-07-2004, 06:34 PM   #18
Wombat North
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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.
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Old 04-07-2004, 06:43 PM   #19
RiftsWRX
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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
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Old 04-07-2004, 08:28 PM   #20
totoherbs
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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?
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Old 04-07-2004, 08:57 PM   #21
Crawford Performance
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What is the compression ratio with that small dish?

Quirt Crawford
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Old 04-07-2004, 09:19 PM   #22
RiftsWRX
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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
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Old 04-07-2004, 10:40 PM   #23
MJU1983
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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
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Old 04-07-2004, 11:26 PM   #24
Wombat North
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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
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Old 04-07-2004, 11:50 PM   #25
boogerwrx
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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
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