That's almost exactly as it's connected in the stock setup. Except that it has the charcoal canister in series. Check the emissions diagrams in the FSM.

 

You could run a line from the fuel tank vent to the air box, so the fumes will just be burn off in the engine. And clamp a crankcase filter/ breather on the crankcase vent.

 

I was going through the FSM for the Series 5 turbo and noticed the vacuum diagram indicates the line between the cannister+top oil filler

nipple and TID has a one way valve which points in the direction of the TID. Doesn't this mean there would be no air passing through the

valve towards the cannister but there would be a vacuum where the vapors from the top nipple+cannister would be sucked through the turbo and

eventually into the dynamic chamber? I was thinking of blocking off the top oil filler nipple and running my line from the charcoal cannister to the

large bottom hose of the PCV via a T which also connects to the centre plate nipple.

Also I have obtained a charcoal cannister from a Series 4 NA and it seems the larger nipple goes to the fuel tank and the smaller one is used

for purging duties. Can anyone confirm this? I blew some air into the larger nipple and it flows fairly easy throughout the cannister. However the smaller

nipple does not allow any air in. Would this be right?

Cheers,
KC

 

The check valve prevents the oil vapours from being blown out of the engine and into the spinning compressor blades when under boost. Droplets of oil hitting the compressor blades at full speed would be a bad thing.


That's not a good way of doing it. Both nipples are there to establish an airflow within the the engine. Air flows from the lower nipple through the center iron to the middle of the crankcase, with picks up all nasties and carries them up to the top nipple on the filler neck.

I think the smaller nipple goes to the fuel tank.

 

The check valve leading to the TID has me confused. The arrow points in the direction of the TID. This will mean the compressor will suck up oil droplets

and fuel vapors from the cannister. The air flows in one direction and that is towards the TID not towards the oil filler neck. The check valve is put in there

I assume to prevent any air blowing back toward the cannister and oil filler neck under boost. I understand what you mean Aaron however why would there

be a check valve with its arrow pointing towards the TID if what you are saying is correct? This will mean air will flow towards the TID not the cannister.

Oil droplets will be drawn in to the compressor. Again it confuses me but that is what I can come up with.