rickya

iTrader: (18)

Looking to get a 3 port catch can with return to sump, most are not internally baffled/chambered. Is this very important or can it be just open inside? The breather system on the car I just bought is VTA breather & I would prefer a catch can for the odd trackday. I use the car daily & am soon to do a few mods & get it mapped again.

B0DSKI

iTrader: (17)

Not entirely sure the importance of them being baffled, but the one that I had fitted @ Mocom is. I'm sure somebody will be along to explain the difference lol

Butty

iTrader: (2)

The baffling adds internal surface area for the oil mist to condense onto and separate.

Very important IMHO to have baffling - preferably stainless steel mesh rather than a solid wall, but not Brillo pad as it breaks up and can enter the engine.

If the tank isn't catching oil then it either the engine isn't being pushed hard enough to create a hot oil mist or the tank is just a poor design.

rickya

iTrader: (18)

Thanks Butty

velohead66

Can I just ask, as this is new ground for me, if there is no oil catcher, would this 'hot oil mist' vent to atmosphere ?

I do a few trackdays, and notice on the long straight that a puff of vapour escapes from the RHS bonnet vent between gear changes, say 3rd -> 4th, and 4th -> 5th at full throttle.
I presume this IS oil mist ??
Where would it vent from ??

Butty

iTrader: (2)

On a car with a standard breather system the mist is redirected through the inlet pipe and into the engine.

How are your head and block breathers set up?

velohead66

I'm not sure, what options/alternative ways could they be set up ?
Can I find out just by looking ?

Butty

iTrader: (2)

A photo of your engine bay and any catch tank would help

velohead66

The car's in the (SN) garage.
Click on the words...1998 Subaru Impreza ...above the avatar, to see the one pic I uplaoded some time ago.
Not sure if you can tell from the picture, but you can see a few things in the engine bay.

I need to look at the physical engine, I can do that tonight when I get home from work.

Butty

iTrader: (2)

No sig of an obvisous cathc tank and at least one set of bretahers are connected to the air filter housing.
It could be the BOV is puffing out oil on a gear change, but I'm surprised its that obvious unless there is a turbo seal oil leak or the rings are worn.

velohead66

I think the rings are ok, maybe it is the turbo.
It's not a lot of vapour, and the oil does goes down but not by too much.
oh well.