Is a catch-can necessary?

[Wetty]

Hi All
Just a quickie, getting the ERG and Dawes fitted next week by Robsons in Perth, do I need to fit a catch-can at the same time or can it wait for a while? I cleaned the MAF and intake hoses today and there was not a large amount of oil in them (MAF was clean), but the intercooler was quit oily so I flushed it with shellite and blew air through it.
Cheers
Wetty

[nissannewby]

In my honest opinion I don't believe they are worth it (this will maybe stir the pot a little) having old crankcase gases going into the intake is only going to hinder performance and create oil issues for your intake it also throws another variable in their if diagnosing oil in the intake after a catch can is fitted. I have both my patrols just breathing to atmosphere ( just my 2c )

[my third 256]

In my honest opinion I don't believe they are worth it (this will maybe stir the pot a little) having old crankcase gases going into the intake is only going to hinder performance and create oil issues for your intake it also throws another variable in their if diagnosing oil in the intake after a catch can is fitted. I have both my patrols just breathing to atmosphere ( just my 2c )

i think you are wrong in what you have said because in the gu patrols the pipe from the top of the rocher cover returns to the intakeair pipe and if you look at the air filter it will have deposits of oil on the filter and also on the bottom
also gets onto the maf sensor and this can put the car into limp mode
so imho i do think they are worth it but i wouldnt vent the drain back into the crank case

[nissannewby]

I know on the 4.2s the breather vents into the vacuum side of the turbo(intake for turbo) is it different on the 3L patrols?

[nissannewby]

Like he could save himself a lot of money if he breathes the crankcase to atmosphere and blocks off where it use to go in the intake with the same results as fitting a catch can ( no oily air in intake at all) should have worded it better as this is hat I meant by worth it. $10 worth of hose over say 200 for a provent to et the same outcome.

[dhuey85]

Venting crank case gasses to the atmosphere is illegal. Put a decent catch can on like the prevent 200 and you won't regret it.

Dhuey

Sent from my GT-I9100 using Tapatalk 2

[dhuey85]

Venting crank case gasses to the atmosphere is illegal. Put a decent catch can on like the prevent 200 and you won't regret it.

Dhuey

Sent from my GT-I9100 using Tapatalk 2

Sent from my GT-I9100 using Tapatalk 2

[my third 256]

all you are doing is putting the catch can inline and it takes out the oil mist then the drain hose is either to atmosphere with a tap on it to drain or plumbed into the crankcase with a non return valve
so you dont get back pressure
im talking about the crd models but there is a lot of threads on here that go into it a lot more for the older models

[Rusty86]

I caught up with Chaz the other week and he was showing me his catch can, and to demonstrate why it's needed, he took the top off of it and then shut the engine off. A cloud of oily mist came out the top of the can, and this would usually go back and possibly foul the MAF sensor. I would say it's definitely worth it for peace of mind.

[Wetty]

Thanks everyone for the input, the wagon is off to Robson Bros to get the EGR plated and Dawse fitted. Provent CC on it's way thanks to flea-bay and even though l am not sure l need em, Autron gauges and pillar pod also coming courtesy of flea-bay. Fingers crossed the old girl will thank me for the mods and not have a Nissy fit!
Wetty