Air Injection System: Description

The air injection system reduces carbon monoxide (CO) and hydrocarbon (HC) emissions by injecting fresh air from a belt-driven air pump into the exhaust gas stream as it leaves the combustion chambers. The oxygen in the fresh air, plus the heat of the exhaust gases, causes further oxidation (burning) of the exhaust gases, thereby reducing CO and HC emissions. The system consists of a belt-driven air pump, an external air delivery line, a pump pressure relief valve, a check valve, and passages in the cylinder head to complete the air delivery system.