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    1. · Registered
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      A colleague mentioned that his old BMW uses a cyclonic air-oil separator for the crankcase ventialtion.


      Heh, basically a Dyson ... Seeing that video, in typical BMW fashion it's a bitch to get to in a BMW. But I wonder how much it might help for a positive-vented-to-intake setup ?

       
    1. · Registered
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      I have the Radium VTE setup as well, though I did upgrade the exhaust side to AN10 fittings and hose. Also, the fittings into the valve covers are AN10 for the exhaust, and AN6 for the intake. I removed the oem PCV valve, and am using the Radium PCV valve right on the left-side catch-can.

      I figure it works as follows ...

      Under idle or no-boost the intake chamber is under vacuum. So it draws from the intake valve cover via the PCV valve, but it's not a huge draw. Enough to ensure the crankcase area can't build up pressure. The exhaust side is also pulling.

      Under boost the intake-side is out of the equation - the PCV valve is closed so nothing goes through there. The exhaust side however sees a significant vacuum draw from the intake pipe. That with the AN10 sizing ensures that crankcase area doesn't build up pressure.

      The catch-cans will do a good job of separating oil from the vapors. Some will get through to the intake, but not enough to worry about. NOTE I say will - I'm still working on the VVTi head and going-single conversion. If it looks like too much oil going through, I have information on using proper air-oil separators


      Radium makes (as usual) a gorgeous one

      IAG makes them, but they're kind of big - this is used to demo in the video above

      And BMW has one, but ugh, plastic
       
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