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

INLET MANIFOLD

’K16’

The inlet manifold is a one piece plastic moulding attached to the cylinder head with a gasket interposed between the 2 components. The throttle housing is bolted to the manifold chamber, sealing being effected by means of an ’O’ ring. The intake air temperature sensor is inserted at the rear just above the pipe flange.

’K16 with VVC’

The alloy inlet manifold assembly comprises a manifold chamber bolted to the inlet manifold with a gasket interposed between the two components. The throttle housing is bolted to the manifold chamber and sealed with and ’O’ ring.

The manifold chamber incorporates the manifold absolute pressure sensor and brake servo vacuum hose union. The air intake temperature sensor is incorporated in the inlet manifold. The inlet manifold is attached to the cylinder head and sealed with a gasket. A strut between the inlet manifold and the cylinder block supports the inlet manifold assembly.

EXHAUST MANIFOLD

The 4 branch fabricated steel exhaust manifold terminates in a siamised front pipe flange. The heated oxygen sensor is located in the manifold at the rear and in the outlet for numbers 2 and 3 cylinders. The manifold flanges are sealed by gaskets.

EXHAUST SYSTEM

The exhaust system consists of a front pipe, catalytic converter, an intermediate pipe which incorporates a silencer and tail pipe assembly which contains a large capacity silencer.

The ’K’ series engine employs a twin front pipe terminating in an expansion chamber.

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.

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.