si-thee

Was thinking about fitting an oil catch tank to my 06 sti??
Has anyone fitted one? whats best place for tapping in and mounting and have you found it makes a difference??

cheers

si-thee

Butty

iTrader: (2)

I started getting a small oil loss after fitting the TD05/20g and traced it to the crank case vent, as the inlet was pretty oily (head venting was clean).

I've fitted a catch tank which interrupts the crank vent and returns back to the inlet with no more oil loss as the catch tank gets emptied back.
Its mounted on the coolant filler tank.

Nick

si-thee

si-thee

thats the same problem im having with the td05 20g
Have you got a picture of which pipe i need to connect into, looking on that pic i thought the crank case vent was a different pipe dont fancy getting it wrong
cheers

Butty

iTrader: (2)

There is a hose going from the PCV Tee to the inlet tube, next to the recirc hose.
I removed that hose and had the crank vent going to the catch tank and then returning back to the inlet hose.

Nick

si-thee

for some reason i cant upload photos??
but i was going to say i thought the crank case breather was the top left rubber hose connected on the pipe attached to the intercooler??

looking at your photo it seems its not?
do you empty your catch tank manually?

cheers

si-thee

this is what i had in mind

Helix catch can install on WRX - ClubWRX Forum - Subaru Impreza WRX and STi Community and Forums

Butty

iTrader: (2)

The install you've linked to has the head breathers connected to a catch can via the pipe on the IC, but I don't get much (if any) oil lost through there.
I get most oil loss from the crank case main vent on the PCV system.

Once a month I take the can off and manually pour the contents back to the sump.

Nick

si-thee

going to have a play with car tomorrow i will see more with ic taken off will let you know how i get on
thanks for you help

Adam K

OT!: Butty,
What's those sensors on the front of the IC and coolant filler tank?

Butty

iTrader: (2)

They're both pressure transducers for gauges.
IC is the boost and the other is for oil pressure.

nick

si-thee

The Official STi engine Venting, A/O Separators, and Catch Cans Thread!! - IWSTI.com: Subaru WRX STI Forums

this is a good write up

si-thee

all done

what alot of messing for such a simple job
while doing this i had a thought? does the crank case vent need to be connected to the air intake i see no reason why it coulnt be vented to atmosphere rather than putting dirty air back into the engine.

JonMc

iTrader: (51)

It is vented back into the inlet to reduce emissions. The oil vapours are then recirculated and burnt during the combustion process.

Butty

iTrader: (2)

It could be vented to air, but I weighed up the hassle involved - a cap & clamp for the inlet connection and to avoid any odd losses of oil to the engine bay, a long hose woudl eb need to run behind the gearbox to dump fumes there.

The air return back to the inlet seems plenty clean if the catch tank is big enough and the oil build up is kept at bay, so I kept it simple.

Nick

Adam K

When I tried that my VTA rocker cover vent vented a lot more oil,, so it seems the suction is good for evacuating gases from the crank case.
To those that wonders why there is a IM-pipe to complement the inlet vent. The inlet will have higher vacuum at all time (unless the turbo is totally shot), meaning the IM-pipe is there to save the turbo and IC from some of the oil coming from the crank case.

Butty

iTrader: (2)

I've not made it clear that the PCV valve is still retained to draw crank fumes into the inlet when off boost.

si-thee

when i was doing the catch tank i noticed the pipe going to pcv valve was not connected it must of been knocked off when i had turbo fitted

chrisdicko

iTrader: (21)

There is something on here which andy forrest wrote about blanking off the PCV, and it's advantages of doing this.......