Turbo D16 valve cover breather...Does it suck or blow?
 

This is being argued on another site I'm on....Basically...I need to know if it is dangerous to not have your valve cover breather vented. I have a catchcan installed like this:

Attachment 19670

I'm being told that the breather should be open to atmosphere or i'll ---- my ---- up. On the other hand i'm being told there is so much blow-by at the breather on a boosted honda, theres not reason to worry. Thoughts?

Re: Turbo D16 valve cover breather...Does it suck or blow?
 

vacuum on the valve cover breather is ok... thats what it is stock. They only problem would come from if it was being pressurized, and from a quick glance at your diagram, it doesn't look like it is

Re: Turbo D16 valve cover breather...Does it suck or blow?
 

if your conserned just open it up

Re: Turbo D16 valve cover breather...Does it suck or blow?
 

Attachment 19663


The two locations I circled don't really make sense to me (keep in mind I'm a noob) but it seems like you would be able to just plug off the opening at the top of the drawing and eliminate the need for the lower line...

Re: Turbo D16 valve cover breather...Does it suck or blow?
 

You could do that, but then 100% of the remaining vapors coming from the catchcan would be coming out the exhaust eventually leading to some smokage. This way, when theres vacuum, it mimics the stock PCV system and routes it back into the motor. Thats what makes it a 2-way setup, and 2-way owns 1-way, ya heard?