adzer

iTrader: (13)

will my 93 wrx ra cdb have forged internals or is it just the sti's?

M535I

from what i have seen some of the early wrx's have cdb , see if its got the hash markings by the crank sensor .as for forged internals i couldnt tell you.

adzer

iTrader: (13)

it should be a closed deck block thats fitted but was wanting to know if the internals would be forged

mit

iTrader: (10)

You can never guarantee what engine it has,as it's 15 years old,and an import,it may have been changed.
As said above,check under the alternator to see if the block has the cross hatching first.

TonyBurns

iTrader: (3)

Out of the factory the internals were not forged, forged internals only on the STi models (v2 upwards i think), wrx's are cast.

Tony

Ste98Turbo

What is a closed deck block and how is it better than a normal block?

hux309

My 94 has what appears to be cross hatching right behind the alternator/ac pump, looks like a bunch of crosshairs to me so id assume she is a cdb?

merlin24

iTrader: (1)

Cross Hatching on a CDB

merlin24

iTrader: (1)

Version 3/4 Cast Piston on the left.
Version 3/4 Forged HF Piston on the right.




STi Version 2 + RA Forged Dog Bone Pistons





Mick

adzer

iTrader: (13)

i cant see any markings like that on my block and i'm gutted thought i might of had a decent block to build from lol. but on inspection i notice my heads have the cross hatch markings???? that mean i have special heads lol or am i just wishful thinking?

hux309

Looks more like forged left cast right if im not mistaken.

I have a cdb wahey!

merlin24

iTrader: (1)

Sorry, but your mistaken ( but at least your have a CDB )

Mick

hux309

Odd, i had forged pistons on my pug and it looked like the piston on the left.

merlin24

iTrader: (1)

The WRX heads have cross hatching also,so nothing special about them unfortunately - it just helps heat dissipation on the surface of the heads.

dazdavies

iTrader: (22)

Defo forged on the right. Forged pistons are smoother.
The hatchings are casting marks as shown on the piston on the left.

Incedently an open deck 2.0L block is still good for over 500bhp. Stock liners on the 2.0L are fairly thick unlike the EJ257 Block

adzer

iTrader: (13)

so would it make any difference if i rebuilt a cdb or odb with forged internals? or do u mean they will both make same power ratings but a cdb would be stronger?

dazdavies

iTrader: (22)

if you're looking for around 500bhp the OD 2.0L block will be fine.

Beyond that then I'd suggest closed deck.

st_manic

a closed block is much better than the standard open deck as it increases block regidity so it is able to withstand higher cylinder presures, this is why the common faults with the open deck is the head gaskets blow easily. closed deck the clear winner for higher boost applications

st_manic

Also i wouldnt advise an open deck 2.0 litre for 500bhp!! Go with closed deck!!