what size pistons

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10 June 2010, 01:05 PM

kb1

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what size pistons

looking to upgrade my06 WRX 2.5l. with forged pistons

i`m told the bore size is 99.5, would like to go to 99.75.

can any one tell me the correct compression ratio and other bits i need cheers

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10 June 2010, 01:11 PM

bigsinky

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why do you want to change to 99.75? i assume you will be changing rods as well a bearings?

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10 June 2010, 01:53 PM

stephen beynon

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99 is the standard bour 99.5 is the first overbour there is a set of forged pisterns forsale in the forsale section I think it's Fiestaboy selling them

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10 June 2010, 02:28 PM

dynamix

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99.5 is standard.

No reason to go oversize unless your bores are knackered. There isnt a vast amount of meat in the std liners to play with so I wouldnt go oversize unless you can really help it.