Manifold & exhaust systems (Inlet manifold): Description and operation

INLET MANIFOLD

The inlet manifold is an aluminium casting, which incorporates a throttle housing, MAP sensor, IACV, IAT sensor, fuel rail and injectors. The inlet manifold is attached to the cylinder head and sealed by two locating rings and a gasket.

EXHAUST MANIFOLD

The cast iron exhaust manifold is fitted with a Heated Oxygen Sensor (HO2S). To assist the extraction of exhaust gases the manifold is divided into two outlets, No.2 and 3 cylinders discharge into one half of the manifold and No.1 and 4 cylinders into the other half.

EXHAUST SYSTEM

The exhaust system consists of a front pipe, catalytic converter and a silencer/tail pipe assembly, which incorporates two silencers. Both silencers contain a series of expansion chambers, resonators and baffles designed to give an improved exhaust system, reduce condensation and increase the life of the system.

The catalytic converter operates in ’closed loop’ system. A Heated Oxygen Sensor (HO2S), located in the exhaust manifold is used to monitor the exhaust gases and provide a signal to the Engine Control Module (ECM). The ECM uses this signal to modify the fuelling and maintain emissions acceptable to the catalytic converter. For information on the operation of the catalytic converter. See EMISSION CONTROL, Description and operation.