Cuonice,

Sounds like a good idea, I'll give it a try before I try a larger catch tank.

 

This is what I ended up doing for the catch can:


I eliminated the PCV valve by capping both ends. I put a catch can with a breather filter on the large vacuum line from the front of the valve cover.

 

this has always been a go-to guide for me as well, thanks rob!

 

An update on the catch can shown in the pic above. I ran an open practice with the pcv valve capped and the Greddy oil catch can attached to the large front vent hose. I had zero issues with blue oil smoke and my oil level didn't change at all after an hour and five minutes on track. The catch can had very little oil in it. It is the pcv valve line that is causing the blue smoke and drop in oil level on our cars.

 

^Thanks for the info. I still need to get a catch can on my car.

 

hi, are there any negatives to capping the pcv like that?

 

Other than making your car emissions illegal I can't think of any negatives.

 

Big fan of the site. Came across it whenever I was first interested in buying an S about 5 months ago. Very helpful information!

 

I tried a variation on this setup at Infineon yesterday and it caused the dipstick to blow out and oiled my engine bay. Ugh.

Instead of capping the PCV, I capped the large vent hose at the front of the block and instead routed a line from the PCV to the catch can and added a breather filter to the catch can.

 

I'm not sure but I think that the reason this did not work is because the PCV is a valve that opens with the vacume form intake. If you run it to the catch can there will be no vacume therefore the PVC will not open and so you have a closed valve cover with no ventilation. If you take the PCV out and then connect the line to the catch can it should work but would then be like using Robs solution connecting the front line only.

I'm wondering abut the "Krank Vents" http://www.et-performance.com/normal.html.

Has anyone tried these as a solution?

The manufacturer says:
These solve the problem and still maintain crank case ventilation. Small Krank Vent goes in the small hose between the OEM PCV and and the intake. The large one goes in the other larger hose. They say you can use a catch can on the hose from the large port at the front of the valve cover if you want. This system creates negative pressure/vacume in the crank case so no more oil getting sucked out and no need for catch can.