Coasting Valve

Connected to intake manifold, valve supplies fresh air from air cleaner to intake manifold to correct overrich mixture during deceleration. When coasting valve opens, intake manifold vacuum connected to vacuum chamber of air control valve is released to atmosphere. This shuts off air to air injection nozzles and directs it to the thermal reactor cooling circuit. The rise of intake manifold vacuum during deceleration and gear shifting causes valve to open, and air from air cleaner is directed to intake manifold to prevent afterburn. When engine speed exceeds 1400±50 RPM, control box energizes solenoid which opens vacuum line leading to vacuum chamber. Pressures in vacuum and air chambers are equalized and air from air cleaner overcomes spring force and flows into intake manifold. In addition, when coasting valve opens, vacuum chamber of air control valve is subjected to atmosphere and pressures in vacuum and air chambers are equalized allowing spring force to operate air cut valve.