944 Models

Blow-by gases leave crankcase through a cast riser bore and then enter ventilation dome in the oil filler neck. The ventilation dome acts as an oil trap for gases. From the trap, gases are routed to engine intake for combustion. Any trapped fresh oil passes through a drain tube and into the oil pan.

Fig 1: Turbo Crankcase Ventilation System

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Fig 2: Crankcase Ventilation System

Courtesy of PORSCHE CARS NORTH AMERICA, INC.