Quick Oil Catch-Can question

[Halon]

Looks like a much better setup. I personally don't use a check valve on the turbo inlet as all it does is create more vacuum at idle/low throttle, but to each their own.

Have you considered a catch can for the turbo inlet line as well?

[mdost03]

Have you considered a catch can for the turbo inlet line as well?

I was, but can't really find a place for a 2nd one in the bay. I might be able to mount it lower by the turbo, but not sure if I want to go that route or not. Do you have one there that you could take some pictures of so I can see how you went about running lines, mounting, etc.?

[Kracka]

Brandon (Halon) is running a single can thats divided so it functions as 2 separate cans.

I'm running a single can between my valve cover and intake pipe, but would like to run a 2nd between my valve cover and intake manifold if I can find the space for another can (or divide mine in half).

[turbotalon1g]

Why don't you guys Y them together into the catch then to a vacuum source?

[Kracka]

A vacuum source during one engine condition can become a pressure source during another.

[Halon]

Like Hughes mentioned, I have a single catch can that is divided in the middle, making it actually 2 catch cans in one. Here's the best picture I have of mine. Basically like your setup, but with a catch can on the Inlet, and no check valve there. Only 1 cheap check valve which is located where you have the other one, betweent the IM and the Catch Can.

http://mitsustyle.com/forums/attachment.php?attachmentid=7498&d=1214007741.jpg

Or you can also kinda see it towards the end of this video.http://www.youtube.com/watch?v=FoNOh750GHU

[mdost03]

Ah ok, that makes sense then. Thanks for posting up the picture. I'll have to search around and see if I can find a smaller catch can for sale somewhere. Thanks for everyone's help!

[turbotalon1g]

Can u explain more please kracka? I am not 100% on what u are saying.

[Kracka]

Why don't you guys Y them together into the catch then to a vacuum source?

This would work fine while the engine is under vacuum, but during an engine load (boost) there will be no place for the blowby and crankcase gasses to go so pressure will build up. To fix that problem though I have a few ideas assuming the 3-port catch-can as pictured in the original post. The top nipple where the filter used to be can either be run to the intake pipe, or, a KV can be placed there between the can and small breather filter. This will prevent incoming air during vacuum conditions, but will allow pressure to escape (with KV/filter) or slight vacuum to be present (routed to intake pipe). Please let me know if this doesn't make sense, I typed this fairly quickly while at work.

[Halon]

Brownman, think about it, at idle the IM is a vacuum source. It is what is drawing the air out at idle.

Under boost, the IM is no longer a vacuum source, it's under pressure. Your PCV (basically a check valve), stops the pressure from going backwards. And now your vacuum source becomes your inlet pipe.

You need those 2 different vacuum sources because like Chris said, the vacuum source under one engine condition, can become a pressure source under a different engine condition.

Chris I just did some quick thinking about what you were saying with a 3 port catch can. Quick thinking about it, I think it'd work.