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Old 04-06-2008, 12:23 AM   #1
DJIMPREZA
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Member#: 1199
Join Date: Apr 2000
Location: Caracas, Venezuela
Vehicle:
1994 Supra+1K, 22b
alike, 07STI

Default CP drop in pistons with 07 sti heads????

so what`s the final compresion ratio on a sti MY07 using off the shelf drop in cp pistons made for the older stis??

The 07 head is different with egr provision and smaller ports...

My static compression is 105 psi with stock 07 sti heads and cams

Any insight ideas regarding this????


Thanks

DJ
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Old 04-06-2008, 12:41 AM   #2
n2oiroc
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Member#: 141952
Join Date: Feb 2007
Chapter/Region: MWSOC
Location: milwaukee, wi
Vehicle:
03 11 wrx/13 brz

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i really wish someone would cc a set of 07 heads!
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Old 04-06-2008, 01:13 AM   #3
Valhakar
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Member#: 39514
Join Date: Jul 2003
Chapter/Region: SWIC
Location: Avondale, AZ
Vehicle:
2003 WRX 2.5L Hybrid
Mostly Blue

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I just pulled my CP drop in pistons. They were loud as hell and would let oil blow by like crazy. I dropped the stock STI pistons back in and the engine is back to running perfectly.
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Old 04-06-2008, 01:21 AM   #4
DJIMPREZA
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Join Date: Apr 2000
Location: Caracas, Venezuela
Vehicle:
1994 Supra+1K, 22b
alike, 07STI

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Mine are perfect and zero blow by, just a though on a possible lower CR than previous years...

Cossworht offers a different head set combo for 07 stis... maybe just provision for egr..
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Old 04-07-2008, 01:01 AM   #5
DJIMPREZA
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Member#: 1199
Join Date: Apr 2000
Location: Caracas, Venezuela
Vehicle:
1994 Supra+1K, 22b
alike, 07STI

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anyone???
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Old 04-07-2008, 01:13 PM   #6
DJIMPREZA
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Member#: 1199
Join Date: Apr 2000
Location: Caracas, Venezuela
Vehicle:
1994 Supra+1K, 22b
alike, 07STI

Default

what`s the static compression test results on a 07 sti? around 140 right?
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Old 04-07-2008, 03:01 PM   #7
jays05
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Join Date: Dec 2004
Chapter/Region: South East
Location: SC
Vehicle:
05 STI 35r + e85

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With off-the-shelf CP 100mm pistons, OEM head gaskets, and .003" off the cylinder heads, I had 120 compression. 135 on the stock motor with the same gauge. MY05 heads.
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Old 04-07-2008, 06:10 PM   #8
MartinSTi05
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Join Date: Apr 2007
Chapter/Region: MWSOC
Location: Rockford, Il
Vehicle:
2006 wrx STi

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I have the equipment to CC heads if anyone near N illinois has a set of heads they want CC'ed
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Old 04-08-2008, 04:45 PM   #9
cdigerlando
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Member#: 6070
Join Date: Apr 2001
Chapter/Region: South East
Location: Longwood, FL
Vehicle:
2015 STi
Dark Gray Metallic

Default Your CP pistons

Quote:
Originally Posted by Valhakar View Post
I just pulled my CP drop in pistons. They were loud as hell and would let oil blow by like crazy. I dropped the stock STI pistons back in and the engine is back to running perfectly.
What bore clearances were you running?
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Old 04-08-2008, 08:39 PM   #10
ronzogonzo
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Join Date: Jan 2007
Chapter/Region: MWSOC
Location: Bartlett,Il
Vehicle:
WRX HTA GT3076R
9cm2 eWG'd It's ALIVE!!

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I'm running CP'S haven't done a comp test yet, but I'm having issues with rogue smoke at start up once in a while I'm kinda concerned I guess. I mean I kinda figured that there would be alittle blow by, but it seems kinda odd that there is no pattern its just random.
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Old 04-09-2008, 02:52 AM   #11
DJIMPREZA
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Join Date: Apr 2000
Location: Caracas, Venezuela
Vehicle:
1994 Supra+1K, 22b
alike, 07STI

Default

Quote:
Originally Posted by ronzogonzo View Post
I'm running CP'S haven't done a comp test yet, but I'm having issues with rogue smoke at start up once in a while I'm kinda concerned I guess. I mean I kinda figured that there would be alittle blow by, but it seems kinda odd that there is no pattern its just random.
Seems like and error on rings posture on pistons or either cyl wall premature wear or something.. I have done many drop in cps with no smoke at all

Check your pcv system?
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