How does the crankcase ventilates on these engine, is there a line somewhere that lets the crankvase vent to the oil tank?

Also, i see that the oil tank seems to be vented witha T with the turbo drain tanks and that is goes back just behing the throttle body with a bunch of other lines. I don't see any check valve though, how does it prevent the boost from going in the oil tank?

If someone knows that system well, please explain.

thanks a lot.

 

It's a dry sump system so there is always a decent vacuum in the crankcase

 

Yeah i know but where is the vacuum coming from, only from the oil pump that returns the oil in the oil tank? Is there a hose plugged somewhere to achieve that or something else?

 

vacuum comes from the pumps, they are designed to draw more then then would ever need to, lots of air with the oil, so it keeps a nice vacuum on the crankcase which helps in many ways.