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| MBRP Cool Duals
Diesel Exhaust System, MBRP - Exhaust, Mufflers & Tips - Diesel
Exhaust Systems |
Corsa Performance
Exhaust, Corsa - Exhaust, Mufflers & Tips - Performance Exhaust
Systems |
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| Borla Exhaust
Systems, - Exhaust, Mufflers & Tips - Performance Exhaust Systems
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Flowmaster Exhaust
Systems – Force II, Flowmaster - Exhaust, Mufflers & Tips
- Performance Exhaust Systems |
About
Exhaust manifolds and pipe:
The exhaust system in any car has two primary roles, one to expel
the waste gases produced in the combustion chamber into the atmosphere
and secondly to reduce noise created due to the expulsion of these
gases. The
main parts comprise of an exhaust manifold, exhaust pipe and seal,
catalytic converter, muffler resonator, tail pipe and heat shields.
In this issue we concentrate on the types of exhaust manifolds,
their purpose and exhaust pipes.
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| The
exhaust manifold is a bank of pipes that collect the gases from the
engines cylinders and direct them to the exhaust pipe. Cast or nodular
iron is generally used to make exhaust manifolds. Manifold designs
depend on the type of engine (in-line, V type, etc) and the number
of cylinders employed (three, four, six, etc). In-line engines have
one exhaust manifold whereas V type engines have an exhaust manifold
facing each bank of cylinders. Each cylinder is provided with a single
passage that blends into a single passage that connects to the exhaust
pipe.
In modern V-type
engines a dual type manifold is employed. This consists of two identical
yet individual exhaust manifolds. A tailpipe sticking out from the
rear on either side of the car is a clear indication of a dual type
of exhaust manifold. This type of manifold is also preferred only
for large displacement engines and is seldom seen on smaller engines.
The exhaust
pipe is a metal pipe made of either aluminised steel, stainless
steel or zinc plated heavy-guage steel. The exhaust pipe connects
the exhaust manifold and the muffler units and in modern engines
incorporates the catalytic convertor in between. In certain vehicles
emission control devices such as exhaust gas recirculation (EGR)
valves, early fuel evaporation (EPE) valves or heat risers are employed.
These are mounted between the exhaust manifold and the exhaust pipe.
In electronic controlled engines an oxygen sensor is installed in
the exhaust pipe. This device senses the amount of oxygen in the
exhaust gas and sends a signal to the control unit to regulate the
air-fuel mixture supplied to the engine as desired.
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