Description

Exhaust System

CATALYTIC CONVERTERS
In the catalytic converters, the exhaust gases are passed through honeycombed ceramic elements coated with a special surface treatment called 'washcoat'. The washcoat increases the surface area of the ceramic elements by a factor of approximately 7000. The washcoat contains palladium and rhodium, which are the active constituents for converting harmful emissions into inert by-products. The palladium and rhodium convert carbon monoxide and hydrocarbons into carbon dioxide and water.

FRONT SECTION - 5.0L NATURALLY ASPIRATED AND SUPERCHARGER
The front section is common to both the naturally aspirated and supercharger vehicles. The front section comprises two separate pipes each incorporating a catalytic converter. Each catalytic converter has a welded pipe with a flange, which is flared into a cone which mates with the exhaust manifold. Each flange has two holes which locate on studs in the exhaust manifold and are secured with nuts. Each catalytic converter is fitted with a mid brick catalyst HO2S (heated oxygen sensor).
A straight pipe from each catalytic converter locates into the front silencer inlet pipes of the center section. The LH (left-hand) pipe is fitted with a mass damper which absorbs resonance from the system.

REAR SECTION - 5.0L NATURALLY ASPIRATED AND SUPERCHARGER
The 2 curved pipes from the front section each connect into 2 curved pipes on the front silencer and are secured with clamps. Two pipes from the front silencer connect directly into the center resonator silencer. The center resonator silencer houses perforated tubes separated by baffle plates. Exhaust gasses exit the resonator silencer via 2 outlet pipes. The 2 pipes from the center resonator split the system into 2 sections which each connect to the pipes of the rear section and are each secured with a clamp. Each pipe has a welded hanger bracket which allow the rear section to be supported on mounting rubbers. A further bracket is welded to each pipe which braces the 2 pipes together.
The 2 rear silencers each have a welded inlet pipe which mate with the outlet pipes from the resonator silencer and are each secured with a clamp. The fabricated rear silencers have 2 perforated tubes which are supported on 2 baffle plates. The exhaust gasses are expelled from the rear silencer via a single outlet pipe. The outlet pipe from each silencer has a welded hanger bar which support the rear silencer on mounting rubbers. The outlet pipe is fitted with a polished stainless steel finisher which is secured to the silencer with a Torca clamp.

CATALYTIC CONVERTERS
The engine management system provides accurately metered quantities of fuel to the combustion chambers to ensure the most efficient use of fuel and to minimize the exhaust emissions. A threaded boss is located on each manifold and a and another threaded boss is located between the starter and the main catalyst to house the pre and post catalyst oxygen sensors. The engine management system monitors the sensors and uses the information to further improve the fuelling and exhaust emissions.