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Air Injection Reactor System: Description

The Air Injection Reactor (AIR) system is used to reduce HC and CO by injecting air into the exhaust ports to continue burning of exhaust gases.

All 4-cyl., 6-cyl. and V8 engine systems includes a belt-driven air pump, specially-designed cylinder head(s), diverter valve with silencer assembly and necessary connecting tubes.

V6 engine (231" Calif. & High Alt.) systems use a specially-designed internal plumbing in the intake manifold which eliminates some of the external passages and tubing. This system also injects air at the 4 outside exhaust ports, rather than at all exhaust ports. This system consists of the belt-driven air pump, special cylinder heads, check valve, vacuum differential valve, air by-pass (diverter) valve and differential delay valve and separator valve assembly.

NOTE: The carburetor and distributor used with this system are specially designed for the special AIR system on these engines. Components are not interchangeable with other engines.
Fig 1: 231" V6 AIR System Schematic (Calif. & High Alt. Only)
G09320678Courtesy of GENERAL MOTORS COMPANY