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What is Exhaust? What does it do?

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What is Exhaust? What does it do?

What is Exhaust? What does it do?

The "exhaust" system in vehicles allows the waste gases generated during the operation of internal combustion engines to be safely and efficiently expelled. The exhaust system optimizes engine usage, while at the same time reducing harmful emissions that save money and controls the noise coming out of the vehicle.

The main components and components of the exhaust system are;

The waste gases generated during the combustion process of the engine are safely transported to the target of the engine. Thanks to solutions such as catalytic converter, the emission of harmful gases (carbon monoxide, hydrocarbons, nitrogen oxides) is reduced. The silencer reduces the noise generated during the exhaust gas outlet.

Exhaust system

The exhaust system ensures efficient operation of the engine and optimal performance. It is directed to the exhaust pipe by collecting the combustion gases coming out of the engine cylinders.

It is a chemical device whose harmful emissions are converted into less harmful ones. It contains precious metals such as platinum, palladium and rhodium. It reduces noise by absorbing the sound waves generated during the exhaust gas outlet. It expels combustion gases from the vehicle. It is located in the back part of the vehicle.

How Does the Exhaust System Work?

The exhaust system is designed to safely and efficiently expel waste gases produced during the combustion process of internal combustion engines. This system optimizes vehicle use, while reducing harmful emissions and controlling engine noise.

Working Principles of the Exhaust System

The Combustion Process

A mixture of fuel and air is ignited in the cylinders of the engine and the combustion process takes place. As a result of this combustion process, exhaust gases (carbon dioxide, water vapor, nitrogen oxides, carbon monoxide, hydrocarbons) are formed under high pressure and temperature.

Exhaust Manifold

The combustion gases are removed from the cylinders of the engine and are based on the exhaust manifold. The exhaust manifold Decouples these gases together and directs them to the exhaust pipe. The manifold is designed to ensure that gases are expelled smoothly and quickly.

Exhaust system Testing

Catalytic Converter

Exhaust gases enter the catalytic converter. This device uses chemical reactions to convert harmful emissions into less harmful pictures. Precious metals such as platinum, palladium and rhodium are usually found in catalytic converters. These metals are converted into carbohydrates, water vapor and nitrogen, which are less harmful harmful components in gases (carbon monoxide, hydrocarbons and nitrogen oxides).


The exhaust gases are cut off from the muffler and the sound waves are reduced. The muffler reduces the noise caused by the operation of the engine by absorbing or reflecting some of the sound. Silencers usually include various compartments and details for canceling sound waves.

Exhaust Pipe

The cleaned and quieted gases are discharged out of the exhaust pipe. The exhaust pipe is usually located at the rear of the vehicle and allows gases to be safely expelled.

Additional Components and Functions Oct.

Exhaust Sensors: Programs such as oxygen sensors (O2 sensors) monitor the distribution of exhaust gases and provide feedback to the engine control unit (ECU). These sensors optimize the engine's air-fuel mixture and increase the emission control system.

Particle Filter

Controls and periodic examinations of exhaust gases and other diseases in diesel engine vehicles, diesel diseases (DPF).

The Importance of the Exhaust System

It protects the air of the parts from harmful gas emissions. Engine noise makes for a quieter ride. It ensures efficient operation of the engine and increases fuel economy. The exhaust system is a critical component both in terms of vehicle performance and maintenance, and its proper operation is an important part of vehicle maintenance.

Which Vehicles Are Not Subject to Exhaust Inspection

Exhaust emission is made mandatory for certain types of substances and for the purpose of controlling the environment. However, some vehicles are exempt from this inspection. There are vehicles that are exempt from exhaust emissions according to the legal regulations in Turkey.

Here Are Some Vehicles That Are Exempt;

Exhaust Emission Measurement

Electric Vehicles

Vehicles that are completely electrically powered and do not have exhaust gas emission.

Hybrid Vehicles

The flexibility (for example, when working only with an electric motor) may vary, but this depends on the type of vehicle and its settings.

Motorcycles and Mopeds

Motorcycles and mopeds with small engine volumes are usually examined from their exhaust.

Agricultural and Forestry Vehicles

Certain agricultural and forestry vehicles, such as agricultural tractors and forestry machinery.

Public Vehicles

Some public service vehicles, such as police vehicles, ambulances and fire trucks.

Historical and Classic Vehicles

Classic vehicles of historical value and a certain age can usually be exempted with special permits.

How much are the Exhaust Inspection Fees for 2024?

as of 2024, the exhaust emission measurement measurements in Turkey are as follows;

Exhaust Emission Measurement Fee: 256 TL

It should be done every two years for passenger vehicles and once a year for commercial vehicles. These fees, T.C. It has been determined by the Ministry of Environment, Urbanism and Climate and is valid for the year 2024. Prices can be updated periodically.

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