Quote:
Originally Posted by healthservices
Yes like a pcv but because the motor is a flat 6 it has a harder time controlling the oil vapors. Its also different from a pcv in that the porsche uses a close crankcase system with no vent.
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In that case...what does Subaru do? They're the only other flat boxer motors being built today IIUC.
Other cars I've worked on have two vents. One is the PCV valve connecting the crankcase to the intake manifold on the engine side of the throttle plate. The other is a plain tube vent (perhaps with a flow restrictor) connecting the crankcase to the intake plumbing between the MAF sensor and the throttle plate. Is the AOS a combination of these two functions?
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