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10 Posts
I am scratching my head on this PCV system. I understand the PCV valve is integral to the cam cover...got it. Now there is what appears to be a PCV hard tube that connects to the top of the intake and goes the inlet of the turbo air intake.
I orginally thought I read somewhere that it looks like it connects to the intake, but is actually connected to crankcase via channels on the head... If that's true I would expect positive pressure coming out of that male connection when I took off the Plastic PCV tube... Nope that thing was under major vacuum! If it's a vent to the crankcase shouldn't it be positive pressure and using vacuum produced by the air intake to "pull" the vapor out?
Then I move into the oil cap and again am wondering what the heck is going on. Call me crazy but the oil fill hole has both vacuum and positive pressure coming from it. If you take a tissue and put it over the opening it is definetly blowing, but then if you take the oil cap and put it on it, it sucks it down like it is a vacuum source... How is it both?
I orginally thought I read somewhere that it looks like it connects to the intake, but is actually connected to crankcase via channels on the head... If that's true I would expect positive pressure coming out of that male connection when I took off the Plastic PCV tube... Nope that thing was under major vacuum! If it's a vent to the crankcase shouldn't it be positive pressure and using vacuum produced by the air intake to "pull" the vapor out?
Then I move into the oil cap and again am wondering what the heck is going on. Call me crazy but the oil fill hole has both vacuum and positive pressure coming from it. If you take a tissue and put it over the opening it is definetly blowing, but then if you take the oil cap and put it on it, it sucks it down like it is a vacuum source... How is it both?