It works. Probably not as good as a collector but it works.
We have run both on a blown deal. The zoomie does exactly what the OP said, it pulls enough vac to keep the oil in the engine. Not nearly as much as a collecter will like Fiat said, but enough to accomplish what the OP was hoping for. A dry clean engine.Well it looks like I'm slow at getting things done. I finally got the tubes in the headers. I added a 6" extension so if it didn't work I didn't mess up my zoomies. My goal was to have atleast no pressure in the crankcase to stop leaks. Well it did what I asked. No more oil leaking out everywhere. So, I was wondering if there was any vacuum in the crankcase. I rigged a fitting on one hose so I could use a vacuum gage. Whacking the throttle on the trailer it showed 3". Was suprised to see any. I then put a fitting in the valve cover. Going down the track at 7400rpm, it pulled 5". This is with stamped steel valve covers. I never thought it would get that much vacuum with this set up. I don't know if that's enough for a performance gain , but it does what I wanted.