Crankcase Ventilation
 

I've read some posts referencing the negative affects of oil in the intake track lately and wanted to see what others were doing to combat the issue. I have added a catchcan on the intake manifold side of the valve cover which catches a fair amount of oil. My concerns now lie with the turbo side/intake side. I'm curious what others have done to allow proper ventilation while keeping oil out of the intake.

My current setup:

https://www.miataturbo.net/attachmen...1&d=1297964754

I'm thinking I could move the PCV valve so it's between the intake manifold and catch can (so boost isn't entering the can), then run the other line through the catch can as well? Or should I just put a filter on the other valve cover nipple and remove the line completely?

Mine looks exactly like above, but instead of the square being a catch can, it's a check valve.

Are you trying to create negative pressure by using the turbo to suck the air out of the engine?

no, it's to prevent boost from entering crankcase.

When in boost the turbo should hold some minimal negative pressure on the crankcase (as far as I understand it).

You should measure about 1-2~hg on the intake...i dunno what we are getting at.

I have both my valve cover ports venting to a catch can. I'm wondering if I should vent one to a catch can, and the other to the turbo intake? I believe this is the way my old FM2 was plumbed.

its all the same, vta probably allows for best evacuation.

route the line to the downpipe. I will eventually do this.