It seems to be a design of PCV valve that holds more vacuum on the interior of the engine block, but adjusts it depending on blowby gas amount.
Just like a dry sump oiling system it might slightly improve MPG by reducing windage drag of the moving parts.
The danger of running two conventional PCV valves is that you pull unfiltered outside air from somewhere where the engine is not sealed properly.
Anyone reading this have access to a "Spintron", that can turn the rotating assembly of a V8 and measure the hp needed?
At typical highway cruise rpms in the 1500 to 2000 range, I wonder how much hp is consumed from internal windage? This could be measured on a Spintron by spinning the engine in normal air pressure, then redoing the test with a vacuum pulled on the block through both valve covers.
