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So_CalXDSM
Post Master
Joined: Thu Jan 28, 2010 2:51 pm Posts: 611 Location: Oxnard,CA
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Evo 9 pistons on 2g 7 bolt?
Looking for a light forged setup and came across the evo 9 oem forged pistons. From what I've read they fit and drop good. But the difference in the combustion chamber affects the compression. It drops from 8.8:1 to somewhat 8.0:1. Has anybody used this setup?? And does a compression this low really affect performance enough to say don't get it?
_________________ ///BBR Tuned
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Sun Aug 29, 2010 8:43 pm |
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Wally
Senior Member
Joined: Wed Feb 18, 2009 1:59 pm Posts: 2238 Location: Los Angeles 90006
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Re: Evo 9 pistons on 2g 7 bolt?
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Sun Aug 29, 2010 8:51 pm |
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So_CalXDSM
Post Master
Joined: Thu Jan 28, 2010 2:51 pm Posts: 611 Location: Oxnard,CA
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Re: Evo 9 pistons on 2g 7 bolt?
True, but I'm not looking at making HUGE numbers nor want to keep it at stock levels. This is why, these are perfect.
_________________ ///BBR Tuned
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Sun Aug 29, 2010 9:09 pm |
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fmedgsx
DSM Regular
Joined: Sun Dec 20, 2009 6:48 pm Posts: 267 Location: san diego the whales vagina
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Re: Evo 9 pistons on 2g 7 bolt?
you would be better off with 2g pistons as alot of people have been pulling the wrist pins out of the evo 9 pistons in our configuration due to having to rotate the piston 180 degrees. normally around 400-450 hp.
_________________ Kris Albee 1997 pearl grey gsx project Holly Wood 1991 tsi awd stock bottom end w/ 2g head, kiggly springs, HKS 272's, RC1200's, shep4, QM twin, fp manifold, full megan exhaust, hx35 in bep housing, ets 4" fmic, BJ'sSMIM, Tial bov, tial 41mm, v3 ecmlink SD, 30psi, E85, 99 problems and this Bitch is one
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Sun Aug 29, 2010 9:26 pm |
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So_CalXDSM
Post Master
Joined: Thu Jan 28, 2010 2:51 pm Posts: 611 Location: Oxnard,CA
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Re: Evo 9 pistons on 2g 7 bolt?
What does rotating pistons mean?
_________________ ///BBR Tuned
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Sun Aug 29, 2010 9:35 pm |
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fmedgsx
DSM Regular
Joined: Sun Dec 20, 2009 6:48 pm Posts: 267 Location: san diego the whales vagina
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Re: Evo 9 pistons on 2g 7 bolt?
inorder to run the evo9 pistons they must be rotated on the rod 180* due to a 1mm offset.
_________________ Kris Albee 1997 pearl grey gsx project Holly Wood 1991 tsi awd stock bottom end w/ 2g head, kiggly springs, HKS 272's, RC1200's, shep4, QM twin, fp manifold, full megan exhaust, hx35 in bep housing, ets 4" fmic, BJ'sSMIM, Tial bov, tial 41mm, v3 ecmlink SD, 30psi, E85, 99 problems and this Bitch is one
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Sun Aug 29, 2010 9:40 pm |
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clockworktoy
Squish Face
Joined: Tue May 22, 2007 7:08 pm Posts: 4327 Location: LBC
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Re: Evo 9 pistons on 2g 7 bolt?
Evo pistons in their stock configuration are 8.8:1, in a dsm 7bolt motor with a head that's been milled before your compression goes somewhere in the 8.5:1 neighborhood (same as 2g pistons). Evo pistons are forged, and have a friction coating on the skirts like aftermarket forged pistons (why i would prefer them over 2g pistons IF and only if price wasn't outrageous). I have not heard of anyone having any trouble with evo pistons on 2g 7bolt rods (same as stock evo rods) other than having to rotate the piston 180* to have the pin offset correct. With that being said i would say stay away form the pistons dsmgraveyard sells and their rings.
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Sun Aug 29, 2010 9:48 pm |
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fmedgsx
DSM Regular
Joined: Sun Dec 20, 2009 6:48 pm Posts: 267 Location: san diego the whales vagina
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Re: Evo 9 pistons on 2g 7 bolt?
here is a guy that has been running the evo 8 pistons for a while and he explains it a bit more in detail. http://www.dsmtuners.com/forums/newbie- ... lp-me.htmlwhat it comes down to is that if you instal the pistons with the dot facing the timing belt as supposed to then the valve reliefs and wrist pin offset is off. meaning the larger intake reliefs are on the exhaust valves.
_________________ Kris Albee 1997 pearl grey gsx project Holly Wood 1991 tsi awd stock bottom end w/ 2g head, kiggly springs, HKS 272's, RC1200's, shep4, QM twin, fp manifold, full megan exhaust, hx35 in bep housing, ets 4" fmic, BJ'sSMIM, Tial bov, tial 41mm, v3 ecmlink SD, 30psi, E85, 99 problems and this Bitch is one
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Sun Aug 29, 2010 9:56 pm |
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So_CalXDSM
Post Master
Joined: Thu Jan 28, 2010 2:51 pm Posts: 611 Location: Oxnard,CA
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Re: Evo 9 pistons on 2g 7 bolt?
Damn i guess ill look elsewhere.
_________________ ///BBR Tuned
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Sun Aug 29, 2010 10:26 pm |
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clockworktoy
Squish Face
Joined: Tue May 22, 2007 7:08 pm Posts: 4327 Location: LBC
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Re: Evo 9 pistons on 2g 7 bolt?
The reliefs on the pistons being backward didn't have any effect on my motor (stock size valves). So I wouldn't worry to much about it.
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Sun Aug 29, 2010 10:51 pm |
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So_CalXDSM
Post Master
Joined: Thu Jan 28, 2010 2:51 pm Posts: 611 Location: Oxnard,CA
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Re: Evo 9 pistons on 2g 7 bolt?
But I thought u said to stay away from these pistons?
_________________ ///BBR Tuned
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Sun Aug 29, 2010 11:33 pm |
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Wally
Senior Member
Joined: Wed Feb 18, 2009 1:59 pm Posts: 2238 Location: Los Angeles 90006
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Re: Evo 9 pistons on 2g 7 bolt?
Lol he meant to stay away from the evo pistons and rings that dsmgraveyard sells for some reason people have had badluck with the stuff they sell.
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Mon Aug 30, 2010 1:15 am |
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Synthetek
Luvz teh Beer!!
Joined: Tue May 22, 2007 6:46 pm Posts: 2848 Location: La Palma, OC
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Re: Evo 9 pistons on 2g 7 bolt?
You install them with the dot facing the timing side, the wrist pin offset will be correct just the valve reliefs are back wards but it does not matter there is enough clearance because these pistons sit lower than ours. The problem is that the rings are expensive 150 from dsmgraveyard if you can get them and $200 from for OEM, there aren't any other options.
_________________99 GSX - 296.5 AWHP
I'm assuming you all have guns and crack!
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Mon Aug 30, 2010 10:11 am |
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clockworktoy
Squish Face
Joined: Tue May 22, 2007 7:08 pm Posts: 4327 Location: LBC
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Re: Evo 9 pistons on 2g 7 bolt?
Like wally said, i meant stay awar from the ones they sell.
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Tue Aug 31, 2010 12:20 am |
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Illeagle
Talon of Doom
Joined: Wed May 23, 2007 10:07 am Posts: 3615 Location: Long Beach
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Re: Evo 9 pistons on 2g 7 bolt?
Whats wrong with your current engine?
_________________1/4 ET-11.657@121.18mph w/ 1.682 60' 445whp/427tq on RRE Dyno All on 91 pump. Do you need your car tooned? Got some extra cash? PM me for details. I offer street and dyno tunes
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Tue Aug 31, 2010 12:07 pm |
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