Exhaust gas control
Page 59
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An AC-Delco air-injection reactor system, designed to control exhaust emission of hydrocarbons and carbon monoxide from petrol engines, is now available for fitting to existing types of power unit. Air under pressure is introduced into the exhaust manifold to promote further burning of the unconsumed exhaust constituents.
An air pump of the non-lubricated semi-articulated type, beltdriven from the engine crankshaft, incorporates a pressurerelief valve and an integral centrifugal air cleaner. A check valve is used to prevent exhaust-gas back flow, which could damage the pump and the hoses connecting the pump to the injection pipes in the exhaust tract and to an intake air bleed (gulp) valve. The gulp valve is piped to the connection between the pump and exhaust tract and is operated by inlet-manifold vacuum to release air from the system during deceleration, which is necessary to prevent explosions in the exhaust pipe. If an engine vvill not accept a gulp valve it can be fitted with a diverter (clump; valve which diverts air from the pump away from the injector pipes during deceleration.
For engines up to approxi mately 2 litres, an 8.7 cu pump is employed, while a 9.'3 cu.in. pump is available for larger engines.
Available from: AC-Delco Division of General Motors Ltd., Dunstable, Beds.