Catch Can help GC8

[greatdanz]

morning, i think i have my catch can installed incorrectly, I have been driving around like this for the past month, it just doesn\'t seem right???? (bear in mind my car isn\'t tuned yet)

anyway out of the crankcase is the factory v3/v4 2 outlet fitting to which I have one of the outlets going directly to the PCV valve and the other is T\'d with the drivers side head, towards the catch can as per pic, passenger side head goes straight to the catch can, im pretty sure something has to be connected to the intake somewhere...

anyway here is a pic of how i setup

yellow lines are the rocker cover breathers

red is pcv

[lachlan]

Is your catch van vent to atmosphere ? Or vent back to pcv ?

[greatdanz]

vent to atmosphere

[Guest]

That\'s the way I did mine on the rs. Doesn\'t need to go back to intake. It\'s plumbed after afm so shouldn\'t change anything besides getting oil residue in your intake

[soopersubaru]

 VADZTER said:

That\'s the way I did mine on the rs. Doesn\'t need to go back to intake. It\'s plumbed after afm so shouldn\'t change anything besides getting oil residue in your intake

Absolutly pointless fitting a catch can if you just feeding the crap back to your intake system anyway. Infact by doing what you are doing is stupid. As this just allows moisture build up in your oil because the sump backpressure is now increased and no longer being evacuated correctly under a vacuum which keeps moisture levels low.

The "crap" (moisture/blowby gases) from the sump breathers should be evacuated and dumped. The lower the crankcase/sump area pressure the better.

Some more info here http://www.clubsub.org.nz/forum/index.php/topic,33282.0.html

[soopersubaru]

Ive said it before an i will state it again. Put waste down the waste pipe!.

Catch cans are a WOFT... A correctly designed exhaust venturi breather system will dispose of this waste milky gunk/oil without dripping out the exhaust or causing excessive or visible smoke!

Even on the track or at hillclimbs I have not been advised of an issue.

Only time I have ever had smoke was when the sump was approx 200ml overfull then i took a long tightening 50kph corner at a considerably higher speed...Then it was like a blown turbo smoking...Cleared very quickly!

One other chap mentioned that there was a slight blue whisper of blue smoke from my exhaust on a hillclimb one day.

During normal/highway daily use there is nothing at all!

My forged motor (40,000km) uses/loses around 500ml per 1000km travelled... That\'s sweet F*#*#* all !!

[greatdanz]

cheers for your help guys,

so you saying I should send the crank breathers to the intake?

[Johnnynz]

 soopersubaru said:

During normal/highway daily use there is nothing at all!

My forged motor (40,000km) uses/loses around 500ml per 1000km travelled... That\'s sweet F*#*#* all !!

Thats interesting. So its not that unusual for me to be losing 500ish mills per 2000 KM on a 60,000KM old Forged motor?

[soopersubaru]

 Johnnynz']

[quote name='soopersubaru said:

During normal/highway daily use there is nothing at all!

My forged motor (40,000km) uses/loses around 500ml per 1000km travelled... That\'s sweet F*#*#* all !!

/quote]

Thats interesting. So its not that unusual for me to be losing 500ish mills per 2000 KM on a 60,000KM old Forged motor?

Sounds about right to me.........The more startups per km travelled the more oil used.......pistons need to swell to correct fit by heating up. rings pass oil n gas until "sealed"

[reaperblitz]

Lol. Would the port to Waterloo Quadrant classified as doing hill climbs ? I thought it was the turbo going but it\'s just cause I got too much oil and its swishing out lols