Rotary Engines

The system used on the rotary engine (RX7) is also a closed system and operates basically the same way as the piston engine arrangement.

Filtered air is drawn into the system through the air cleaner, mixed with the gases and vapors that blow by the rotor during engine operation, and is drawn out through a purge valve and into the intake manifold. The purge valve operates as the PCV valve in this system.

Fig 1: Crankcase Ventilation System for Mazda Piston Engines (626 and B2000 Shown)

Courtesy of MAZDA MOTORS CORP.

GLC FWD models have valve located in valve cover