Car Exhausts - Vehicle Exhausts

New Exhausts For Cars

Exhaust System Fitting

Service Requirement

Exhaust System
The exhaust system vents poisonous combustion gases away from the driver and passenger compartment to ensure they are unlikely to enter the vehicle.

The tiny explosions as fuel and air ignite in the engine cylinders creates a lot of noise. Luckily, the pipework carrying the exhaust gases to safety causes a dramatic reduction in engine noise.

When the exhaust corrodes forming a hole in the tube or baffle wall the dramatic noise increase makes exhaust failure easy to detect.

Exhaust Parts

The Car Exhaust is made from different sections bolted or welded together. The exhaust parts comprise:-

Exhaust Manifold The exhaust manifold attaches to the Engine Cylinder Head and is made-up from a series of pipes designed to carry the vent gases from each ignition chamber. The exhaust manifold pipes usually merge into one vent pipe. Usually the exhaust manifold is made of cast iron although the materials can be used for example: aluminium, steel, or stainless steel.

Header - Manifold The header is a form of manifold allowing the engine to vent exhaust gases from the cylinders. The header is designed to enhance performance reducing exhaust back-pressure that wastes energy and reduces efficiency. This piston can then convert more combustion energy into rotational force and increase the effective engine power.

The exhaust header helps to reduce back-pressure by giving each cylinder its own exhaust pipe. The header pipes are designed to give an identical exhaust gas path into a common collector pipe.

Oxygen sensor - Lambda Sensor
Vehicles designed to use a fuel injected engine have an Oxygen Sensor (Lambda sensor) to monitor how much oxygen is present in the exhaust gas. A computer programmed with engine performance data interprets sensor information to adjust the amount of fuel injected into the ignition chamber for optimal performance.

Catalytic Converter
A catalyst in the converter is arranged to give a high reactive surface area for exhaust gases to flow over. Carbon monoxide and unburnt or partially combusted hydrocarbons (fuel) are converted into carbon dioxide and water. Heat from the engine is used to optimise catalytic efficiency.

Back Box or Muffler
The purpose of the backbox is to ensure sufficient noise reduction. It contains a deceptively simple system of baffles that bounce the sound waves created by the combustion explosions of the engine. As the sound waves bounce back and forth they interfere and mostly cancel out. Some boxes are packed with fiberglass or other sound deadening packing to improve sound deadening performance.

Exhaust pipes
The sections of exhaust tubing connecting the exhaust components together are known as the exhaust pipe. Due to vehicle manufacturing variations; every exhaust pipe is uniquely shaped to fit a particular make and model.

Fitting a larger tailpipe produces the characteristic big-bore sound, as the sound exiting the pipe is richer in low-frequency sound waves.

Exhaust Fittings and Exhaust Suspension
The exhaust uses a series of gaskets compressed between the connective flanges to clamp or bolt the exhaust sections together. The exhaust is normally suspended on a series of rubber hangers that allow the exhaust to flex and reduce vibration and noise transfer into the cabin.

MOT & Servicing

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