Sti pistons question
#3
Scooby Regular
iTrader: (1)
You will be fine swapping either the HF forged pistons from the STi V3 for your cast dogbone pistons in your '95 WRX or fitting the STi V3 short motor.
The static CR will be near enough the same due to:
The combustion chamber volume's are the same between the EJ20G and EJ20K heads.
The compressed thickness of the WRX graphite composite head gasket and the STi V3~4 MLS head gasket are the same.
The piston volume of the WRX dogbone piston and the STi V3~4 HF forged piston are within 1~2 cc of each other IIRC.
Your only limiting factor tuning wise are your WRX Hydraulic heads - STi heads would be a far better option.
Hope this helps
Mick
The static CR will be near enough the same due to:
The combustion chamber volume's are the same between the EJ20G and EJ20K heads.
The compressed thickness of the WRX graphite composite head gasket and the STi V3~4 MLS head gasket are the same.
The piston volume of the WRX dogbone piston and the STi V3~4 HF forged piston are within 1~2 cc of each other IIRC.
Your only limiting factor tuning wise are your WRX Hydraulic heads - STi heads would be a far better option.
Hope this helps
Mick
#6
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Join Date: Dec 2009
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standard pistons are classafied into two grades, "A" and "B" these grades should be used as a guide line to selcting the standard sized piston
A = 92.005 -92.015 mm
B = 91.995 - 92.005 mm
this is what is says in my manuel, not quite sure what it means but its a start. i have the whole manuel i can send via a email if u want
A = 92.005 -92.015 mm
B = 91.995 - 92.005 mm
this is what is says in my manuel, not quite sure what it means but its a start. i have the whole manuel i can send via a email if u want