Quote:
Originally Posted by The Radium King
flow across the end of a tube can create suction, so if the tube is introduced at an appropriate place in the airbox or elsewhere upstream of the throttle then there is opportunity for vacuum, but no idea if sufficient. note the 997.2 that appears to vent the heads directly to the intake tube while the crankcase goes to the plenum via an aos (if i am reading the parts diagrams properly).
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Vacuum levels created by flow across an opening are totally dependent upon flow rates, which are never constant in the intake box. The heads on the 997.2 do not "vent" into the intake tube while the engine is running.
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