Manifold & exhaust systems (Exhaust system): Description and operation

EXHAUST SYSTEM

The exhaust system consists of a front pipe, catalytic converter, an intermediate pipe which incorporates a silencer (not ’L’ series) and tail pipe assembly which contains a large capacity silencer.

The ’K’ series engine employs a twin front pipe terminating in an expansion chamber. The ’L’ series front pipe consists of a single constant diameter pipe with integral flexible joint.

All the silencers contain a series of expansion chambers, resonators and baffles designed to give an improved exhaust system, which reduces condensation and increases the life of the system.

Except for ’L’ series which is open loop, the catalytic converter operates in a ’closed loop’ system. The exhaust gases are monitored by the oxygen sensor which provides a signal which is used by the Engine Control Module (ECM) to modify the fueling to maintain emissions acceptable to the catalytic converter. For information on the operation of the catalyst. See EMISSION CONTROL, Description and operation.