this might be a dum question but hey, with oil catch tank you get the tank with two conectors, one is fotr thr pipe that you would conect to the plastic pipe joining both breather things but what gose on the other like?a filter or something?

 

ok iv worked one part of this out, the two breatherson teh rocker covers, join tehm with some hosing, ad a t-piece in the nmiddle and then fom that t-piece to one side of the catch tank, but sdill, where dose the other side go?

 

it vents to the atmos via a breather filter, you will probably find you will need to T in the crank breather and block off the PCV valve before you get anything in the tank mind

 

have you got any pictures? im a bit confused!lol haha

 

in simplistic terms:
there are 3 breathers to an ej20.
The 2 cam breathers, 1 each side on top of the rocker cover.
The 1 crank breather, to the right as you look at the turbo head on.
All 3 need to vent to the catch can, but you need a vent from the catch can to allow the pressure to disperse.
So in effect you need 4 outlets to the catch can, oh and a drain point at the bottom is also bloody handy.
Catch can should ideally be about 1.5 or 2 litres

 

As above if you only connect rocker cover side then it won't blow by the gases meaning the catch can will just look pretty and not function. The idea is to "catch" the dirty oil and return the clean air. Peanuts has it in one

T

 

aaa right, is that the bit thats behinde and to lefta bit of the throtle body? think i understand now, so they all need to be linked and in to the tank then the tank needs to breath, gotcha!lol. ill leave that til the engines back in then, lol, enything the breathers used to lijnk to can they just be blocked off like?

cheers

 

the PCV valve is that the little thing beneath the throtle body?

 

this is my 4 port catch can. make sure the vent port is bigger than the other 3

 

Yes it is.

 

thank you much, lol,

so

i block that of,

take the rocker breathers and the breather from next to the throtle body on the block into the catch tank

then veent the catch tank to atmosfire (via a breather filter)

correct?

 

dont bother with any breather filters

 

so just vent it to air, maby put a pipe from vent port to some where out of the way and tidy,

 

Iv been reading this thread with great interest, you say you need a catch tank with 4 outlets, will this be a custom jobby? or can you just use a "T" peice as most tanks only have 2 outlets....

and secondly you advise of a 1.5 or 2 litre tank, why is this? how much oil should it be catching?

im a little confised.

Cheers

 

Just need to go for a quality one which has been designed for the impreza.
Roger Clark Motorsport - RCM Product Detail

 

I fitted my oil catch can where the original EVAP canister used to be. I also had 3 ports on the tank, one to rocker cover breathers, one to crank-case breather, and then one to atmosphere with no filter. Really easy to install mate. Give me a pm if you struggle.

 

You dont need it to be that big. It collects a fair bit, as the breathers are venting warm vapour from the engine. This causes condensation. What is collected in the can will be a mayo type gunky mess.

 

Cheers guys, just had a look at the RCM one, nice bit of kit, but looks like it will be akward to drain when it gets full....

do you have to remove the inlet manifold to fit a catch can?

 

no

 

thanks for the help guys, going to oder one tonight i think, and find something to block the pcv valve off,

ill have a modefied emision system and fyel system by the time the engine goes back in

 

Sorry to hijack, but what is the PCV? and how do you plan on blocking it....

 

from what i remember it is a 1 way valve that opens up at a set pressure/vacume.

some people take it out and use a big bolt to replace it, i couldnt find one the right thread, so i just jubled a bit of hose over it with a bung in the end. job done.

 

I thought you were meant to retain the PCV valve and block off the vent into the inlet manifold leaving the PCV to vent directly to the catch can?

If you only vent the cam cover breathers to the catch can you'll hardly catch any oil.....if any???

 

mine is over by the turbo



ps. mates hooked his up just to the cam breathers and has never caught anything in about 3 years LOL

 

Exactly, virtually all the oil vapour comes out of the crankcase breather. Also a good idea to retain your PCV too.......

 

with the pcv not blocked up, i never ever caught anything!!

as you can see by my pipes, now i collect stuff

 

So then, just to clarify, you've blocked your crankcase beather at the PCV and are getting oil vapour from your cam breathers????

 

crank and cam breathers T`d together and going into the can, PCV valve is blocked off on the inlet manifold as i did not have a bolt the right size

 

Is there any adverse problems in blocking off the PCV?

Has anyone got a nice little drawing for nuggest head here, who is struggling to figure out what hose to cut into and join up?

I've got a three outlet can, one venting and two for connections somewhere?