Removing oil from the intake

[winnie_man]

Ok so I have been doing a bit of investigating into catch can set-ups and I'm yet to find a decent setup for a 3S-GTE.
We all know at the end of the day its all about cleaning the air and keeping the pressure down. Because of the GenII AFM parasite this makes it difficult. You can go to auto barn and grab the nearest $50 "tank" and call it a set up but the truth is its no more better than stock as its generally un baffled and cheap. Generally ends in tears.
Then you have your baffled systems which INCREASE pressure under boost. WTF! This will end up destroying your engine.

So what I want to know is are there any tried and tested systems that people know and use?

[LeeRoy]

Then you have your baffled systems which INCREASE pressure under boost. WTF! This will end up destroying your engine.

Care to explain?

Why not grab a cheap $50 one and fill it with steel wool.

[Draven]

vent to atmo, ftw

[andrew_mx83]

600ml coke bottle
hose
duct tape

[1jz68u]

when i put one on my 3SGTE it took no time at all to get lots of stuff in it. i would recommend if you have a 3SGTE you get one asap. i have known 3 others with GTE's and same thing happened with them all. i think anything would be better than stock as long as its not going back into the intake.

[winnie_man]

[QUOTE=LeeRoy]Care to explain?

The stock setup uses a vacuum generated by the intake to reduce pressure inside the cam cover when the engine in under high loads such as on boost ect. When the engine is idling It drops pressure below atmospheric which is the purpose of the PVC valve to stop the pressure normalising.
Low pressure in the cam cover is a good thing. So when a baffled catch can is used pressure is raised in the cam cover, depends on how crazy you get and how much oil you want to remove. This results in bad things such as crank case (sump) pressure increases which pushes oil up through the rings :O and blows the dipstick out!
The thing with those $50 tanks is they aren't baffled properly, they either don't do the job and are just ricer items or they pressurise the cam cover.

What I want to know is has anyone experimented with routing to the exhaust or using breather systems? Im sure a well baffled catch with a breather between the can and pcv would be fine but I just want to know what works with the AFM. DAM GEN TWO!!!
And is it hard to route back to the crank case?

[LeeRoy]

I think your misguided.

Your not creating pressure in the covers but you are creating a restriction. Without a restriction you will never remove the oil from the air but rather only act to create a larger area for oily air to inhabit.

I'll assume the catch can setup your thinking of does have a return to the intake in which case I think your trying to overcomplicate something that is ever so simple.

Catch cans are a bandaid solution for engine that often have excessive wear, in which case money and efforts could be redirected in areas that are more in need.

The answer is simple, regardless of what you do you will always have oil in the intake tract if you plumb a catch can back up, the only difference is in the quantity. If you want no oil then don't return the line.

[TERRA Operative]

winnie man, the catch can just goes in line with the stock breather. What's stopping what you describe with the stock breather system?

A well baffled can will catch the oil, whether you connect it to the cam cover or sump shouldn't make much of a difference, as it's all connected anyway. Connecting to the sump may cause excess oil to be picked up due to windage and sloshing though.

The breather connects pre-charger, so it never sees boost pressure, and when the car is idling, there should be very little blow-by anyway so a high vacuum in the cam cover in't needed.
As you rev the car, intake vacuum pre-charger will increase, which will suck the blow-by caused by the high revs through the can and create your vacuum in the cam cover.

A restriction in the pipe between the pcv connection and free air will only serve to increase the vacuum present. (Like putting your hand over a vacuum cleaner nozzle) Your AFM will cause this effect in exactly the same way.

[winnie_man]

Really, I always thought a PCV valve was designed to remove pressure in the crank case which is created by blow by gasses, and the reason it is routed to the intake because its lower than atmospheric which helps pull the blow by gasses. Probably should google it .

It is therefore an emissions requirement as well as a functional necessity that the crankcase has a ventilation system. Any cop that knows his shit will be able to check for a return to the intake, and with a coupe 6" of the ground, bonnet scoop, 3" exhaust with a cannon I kind of look obvious (in progress of sleeping it a little I just brought the car as is in June), coppers in Wagga don't like rice very much.

Basically without a return and dumping any atmospheric vapours (they love the wand in Wagga) results in a canary and I don't need that!

[winnie_man]

winnie man, the catch can just goes in line with the stock breather. What's stopping what you describe with the stock breather system?

A well baffled can will catch the oil, whether you connect it to the cam cover or sump shouldn't make much of a difference, as it's all connected anyway. Connecting to the sump may cause excess oil to be picked up due to windage and sloshing though.

The breather connects pre-charger, so it never sees boost pressure, and when the car is idling, there should be very little blow-by anyway so a high vacuum in the cam cover in't needed.
As you rev the car, intake vacuum pre-charger will increase, which will suck the blow-by caused by the high revs through the can and create your vacuum in the cam cover.

A restriction in the pipe between the pcv connection and free air will only serve to increase the vacuum present. (Like putting your hand over a vacuum cleaner nozzle) Your AFM will cause this effect in exactly the same way.

lolz perhaps you misunderstood me? you basically just reassured everything I said. What I meant by routing to the sump was to return oil to the sump from the catch.

Of course it connects pre charger lol hence the need for a low pressure return to pull gasses from the crank case! The reason the crank case sees more pressure under boost is because more fuel being burnt which causes more blow by.

A baffled catch between the intake and PVC is a restriction that's what I'm saying, which causes higher pressures.

[TERRA Operative]

Yes, but the greater vacuum caused by the increased induction counteracts the increased blow-by.

The restriction caused by the catchcan is negligable in the grand scheme of things. If you are worried about it, just run larger pipes and catch can.

Re. draining the oil back, it can be done, but you'll need a non return valve to prevent the oil being sucked into the can from the sump.

Having said that, if you are getting that much oil that it needs to be constantly drained, you need to look at your rings etc........