Air Injection System: Notes

The air injection system reduces carbon monoxide (CO) and hydrocarbon (HC) content of exhaust gases. It injects fresh air into exhaust gas stream, which continues combustion of unburned gases. Air can be by-passed to atmosphere by a thermactor air by-pass valve and/or directed near exhaust manifold or catalytic converter.

Depending upon engine size and application, individual systems may vary in number and type of components. All systems use same basic components: air supply pump, air by-pass valve, filter, check valve(s), air control valve, air manifold and air hoses. Some models may use a combined air by-pass/air control valve.