I think it is ok to add another set of holes, but I do want to make the oil vapor travel the longest distance possible through the condensing media.

comments?

 

compromise is the name of the game... drill the holes halfway down the snorkel... whatcha think?

 

Actually, I think we want the breather line from the valve cover to go through the top of the DC3 into the condensing media, and up the side return fitting. Because we want to keep blow-by from going into the turbo. The worst that could happen in the overflow scenario is that possibly blow-by would get sucked back into the valve cover...but this is where it normally is found.
I am not against adding holes a big higher, but I think that is counter productive to the design.

comments?

 

maybe just a few higher? but thats the can that doesn't fill up as fast, theoretically, right?

 

Correct, I am recommending checking it at every oil change. But a person that loves their car checks it more often.

 

couldnt we keep the pcv valve on the crank case and just put a check valve on the other side of the catch can?

 

relocating the PCV valve is only a suggestion that was made before. It sounds like a good idea to keep it operating best, but I would like to get more feedback about this.

 

The only drawback I can see about an inline checkvalve + PCV setup is that the system would just have to work a little harder to overcome the added force of the spring from the check valve. Honestly judging from the construction of the DC3 it should be able to handle ~20 psi of positive pressure; you might not need to relocate the PCV valve or run an additional check valve. I'm not running one with my current setup and it's been fine. I just put on some teflon tape on all the fittings to prevent any pressure leaks.

Saikou-san: The best placement I've seen for the PCV valve can is where the Perrin catch can is designed to mount (as someone's already brought up). I'll snap a picture of one tonight for reference's sake to give you an idea. It's much closer than the position you're describing.

 

Hey cool deal!

 

I only skipped through this but what is wrong about running two hoses from the crankcase to a single can with a breather at the top of it? Thats what I do. Obviously any pressure that builds up in the crankcase gets vented to my little oil collector guy. This to me seems fine. I dont have any oil in the intake system what-so-ever. Any evaporated sludgey stuff also goes into my little oil collector guy. Maybe I am missing the point but I have done this with many cars and never ran into a problem

 

Technically, if both lines are running to a OCC with a breather, there is no vacuum to draw out the oil vapors from your valve cover. Some oil/ junk may escape because of thermal expansion when the engine heats up. Normally, vacuum from the intake manifold draws out these gases through the PCV line, and the air is replaced through the breather. Your breather is also venting to atmosphere. This is emissions illegal.

I read a very good FAQ on NASIOC, let me see if I can attach it here.

 

My car is so far from emmissions legal the breather is the last of my concerns

As for the sucking out of gasses, I figure enough spraying of oil and such throws enough of it out. And since the gasses will be warmer than the ambient air they should evaporate out into the breather anyhow. I dunno It just seems to me that getting it all in a breather would be safer than trying to reburn all that crap anyways. Not only would it coke up my intake, intercooler, intake manifold but also the pistons and everything else in there. Granted it may not be much but I dont honestly think there is a benifit of trying to suck it all out.

 

The point is that moisture and blow by gases are both corrosive and they build up in your oil if they are not evacuated via the PCV system. Yes some of them come out when it is just vented, but not nearly as much as when sucked out by the PCV system. Haveing a dual catch can setup as discussed results in none of this crap ending up in your intake manifold OR in the intake pipe/turbo/intercooler while maintining the benefits of the PCV system.

Keith

 

Here is a picture of a $9 catch .



I removed the other trap on the plenum runners side for now - the oil that I was catching (2cc/day) may serve a purpose I fear.

They other side works great

 

that picture is way to small to see anything!