WRX RCY

Hi all,

I'm looking for some details on the above pistons. I bought the pistons off ebay. The description said they where 2.0 wiseco pistons, but measured them and their 98mm (2.2). And on the box they where delivered in was a lateral performance wiseco's. So, what I need to know is what measurement I could take to find out i their for a 2.35 build?

Chris

bluerigster

iTrader: (9)

There is a 3mm difference in compression height between a standard and stroker Wiseco piston, a standard 75mm stroke piston has a compression height of 33.25mm and a 79mm stroke piston has a compression height of 30.25mm.

If the series number is still visible on the crown of the piston, it should read
K601M + piston diameter (K601M98) for standard 75mm stroke. Or K602M98 for the longer 79mm stroke pistons.

wrx287

iTrader: (8)

^^^^^^^^^^^^^^^^^^^^^^^^^What he said

WRX RCY

When you say compression height is that from the center of the pin to the top of the piston? If so, they are a 79mm stroke piston. But, the stamp makings on them are 'A3L' and width are 98.2

bluerigster

iTrader: (9)

Yeah the compression height is distance between the gudgeon pin centre and piston crown, the marking must be different as they are made for lateral so probably a different dish cc compared to Wiseco's own pistons.

WRX RCY

Well if that the case I'll be doing a 2.35 build

bluerigster

iTrader: (9)

Technically the engine displacement would work out 2383.57cc.

I personally wouldn't over bore an EJ22t block to 98mm unless completely necessary, as it wouldn't leave much thickness on the liners if your looking towards running big power.

WRX RCY

Bad news they are standard 2.5, and I ain't happy

bluerigster

iTrader: (9)

Were these sold as Wiseco forged pistons on fleaBay?

WRX RCY

No they where sold as 2.0 piston. But after emails back and for, he said they where after market 2.0 wiseco pistons

bluerigster

iTrader: (9)

Standard EJ25 pistons aren't even worth the return postage, how much did you pay for them?