HELP, pistons???
21 February 2009, 03:00 PM
#1
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HELP, pistons???
hi can someone help 
just swaping the bottom end on my V3 type R ( Import )
noticed that the bottom end i have bought has different style of piston?
will this fit?
just swaping the bottom end on my V3 type R ( Import )
noticed that the bottom end i have bought has different style of piston?
will this fit?
21 February 2009, 03:17 PM
#2
Top piston is a Version 7 ~ 8 fitted in a semi-closed deck block.
Bottom piston is a Version 3 ~ 4 standard size piston ( looks like you have big end failure on No.2 Cylinder if the picture is the right way up ).)
Up to and including Version 4 - the piston will sit above the deck height and use a thick Multi Layer Steel head gasket on the STi's ( composite head gasket on your old block - WRX/Type R etc).
Version 5 onwards - the piston normally sits below deck and uses a thin MLS head gasket on the WRX and STi's.
You will prob end up using a thick MLS head gasket on the later STi 7 block but that is dependant on what heads you are using/volume of the heads/ actual piston deck height to keep the Compression Ratio somewhere near.
Mick
Bottom piston is a Version 3 ~ 4 standard size piston ( looks like you have big end failure on No.2 Cylinder if the picture is the right way up ).)
Up to and including Version 4 - the piston will sit above the deck height and use a thick Multi Layer Steel head gasket on the STi's ( composite head gasket on your old block - WRX/Type R etc).
Version 5 onwards - the piston normally sits below deck and uses a thin MLS head gasket on the WRX and STi's.
You will prob end up using a thick MLS head gasket on the later STi 7 block but that is dependant on what heads you are using/volume of the heads/ actual piston deck height to keep the Compression Ratio somewhere near.
Mick
Last edited by merlin24; 21 February 2009 at 03:19 PM. Reason: spelling
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