Quote:
Originally Posted by JCL
You wouldn't just need a hose, you would need a PCV (positive crankcase ventilation) valve, essentially a one-way vent valve that has a variable opening or restriction. It is calibrated to the engine's operation, ie how much vacuum there is in the intake manifold.
PCV valves still need to be maintained. They can get gummed up, and blocked, exactly the same as a CCV. The consequences are the same as with a blocked CCV.
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I remember my old american cars. They had that PCV valve. But I'm 99% sure that my two E30s didn't have a PCV valve nor a CCV. There was a sheet metal plate under the valve cover to keep oil from splashing directly into the hose, and that hose was going to the throttle body.
The X5 draws the fumes into the intake manifold, which is under vacuum, and the possibility of sucking oil is there, in the event of a torn diaphragm. By going to the intake tube, which is at atmospheric pressure, this could not happend.
May be I'm missing something. I will study the system more when the X5 will be in my driveway
