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Old 05-24-2007, 07:12 AM   #1
Scooby Newbie
Member#: 126146
Join Date: Sep 2006
Default Ej20g piston replacement help........

Ok guys I would like to know what other ej20 series piston's that are forged that can fit my ej20g. I had 2 of my pistons break at the piston ring area and I want something stronger and better for replacement. We have a version 6 sti pistons available, also a version 4 wrx ra pistons also I think ej20k I'm not sure. The difference is that my stock pistons are taller then the other two, but same 92mm size. Will one of these be an ok replacement or should I find some after market racing pistons? I've really had some badluck with my ej20g cause its my second motor because the previous one melted the pistons after shattering some piston rings. It seems like a weak point of the ej20g I've encountered is the stock pistons. So yes I'm still a noob at the subaru thing so everyone's opinions and info's will help greatly.
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Old 05-24-2007, 05:01 PM   #2
Scooby Guru
Member#: 48199
Join Date: Nov 2003
Location: Maryland
06 WRX


I personally would just find aftermarket pistons. I'd definately do ALL the pistons vs just replacing 2 with different make/model pistons.

Are you leaning that thing out? Seems like yes the pistons might be the weak point but tuning the car not to burn up piston is better then trying to get piston that can accommidate lean/hot conditions. You'll just run into another "weak" point if you do that....IE crank/rods/etc...

Good luck...I know I wasnt to much help but its a free bump...

Also you might want to search or even ask in the 2.0 section. This gets a lot of views here but some of the more experienced members may see it over there...
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Old 05-24-2007, 10:47 PM   #3
Scooby Newbie
Member#: 126146
Join Date: Sep 2006

Thanks for the post, but ya I'm not replacing the 2 broken pistons with other ones. I'm actually replacing all 4 pistons for stronger forged ones. Sorry if I wasn't too clear. Well as for my mods its got a reflashed ecu which was done from japan cause I got the car which was shipped from japan with it, also a fujitsubo tbe, hks bov, hks intake, and hks boost controller. There's not enough knowledge in the island I'm at over here in the philippines about subaru motors.
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Old 05-25-2007, 09:48 AM   #4
Scooby Specialist
Member#: 11620
Join Date: Oct 2001
Location: Ontario
1997 GF4-STiV3 clone


I don't think you want to use K pistons. The combustion chambers are different sizes and your compression would be off. Try your question in the built motor forum. You should likely go aftermarket forged - try wiseco.
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