Anti-Afterburn Valve
- Valve prevents afterburn by supplying air to intake manifold during deceleration, gear shifting, and immediately after engine is switched off. Valve operates by pressure difference between vacuum chamber and air chamber, and spring force. Operating time is.7 second when pressure difference is 15.75" (400 mm) of mercury.
- Intake manifold vacuum rises during deceleration and gear shifting, and pressure difference between the two chambers opens valve connected to diaphragm so fresh air is led into intake manifold to correct over rich mixture, preventing afterburn.
- When engine is switched off, solenoid opens sensing line and due to pressure difference between vacuum chamber and air chamber, the valve connected to the diaphragm is opened, and fresh air is led from air cleaner to intake manifold.
- A valance hole in the diaphragm connects vacuum chamber and air chamber to control duration of valve opening. When pressures between chambers are equal, valve is kept closed by spring force. When pressure difference exceeds 3.94" (100 mm) of mercury, valve is opened to lead fresh air from air cleaner into intake manifold. When valance hole equalizes pressure difference, valve is closed and shuts off air.
Courtesy of MAZDA MOTORS CORP.
Courtesy of MAZDA MOTORS CORP.