james-wrx

Does anyone have a picture of standard JDM WRX pistons for a classic, I am trying to see if the pistons in my block are standard they are supposed to be forged but i am not sure, they look identical to the Mahle one's but is that because the mahle one's look identical to the standard ones LoL

ticky

If they are forged they will have a smooth surface inside. Where as cast will have a cross hatching pattern.

james-wrx

Ah-Ha thanks for that, will this show even after they have done a few thousand miles?

james-wrx

ok smarty pant's how can you tell if the crank is forged?

ticky

forged sti 2 pistons below:

http://i302.photobucket.com/albums/n...Photo-0112.jpg


cast 2005 wrx pistons below:

http://i302.photobucket.com/albums/n...Photo-0113.jpg

silent running

Exactly as ticky says, standard cast ones have cross hatching underneath, the forged are smooth. Their mileage/age makes no difference to this, as the undersides don't wear.

james-wrx

ok what if they are still in the block?

ticky

remove the sump & use a torch, you might make out the hatching?

james-wrx

And the crank??


Only kidding thanks for youe help!!

but seriously .................the crank?

silent running

No idea. Aren't they all forged? I don't think the standard cranks are considered a weak point anyway. I was under the impression that all classic EJ20 cranks were identical.

dazdavies

iTrader: (22)

Not quite identical.

Some EJ20 have the Centre thrust bearing the later ones have the thrust bearing at the and of the crank, (bellhousing end).

all the EJ20 cranks have a 75mm Stroke.

james-wrx

Ah yes but mine is supposed to have a Billett one!
Quite how you tell is beyond me though

dazdavies

iTrader: (22)

It will be far neater looking than the subaru item.