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What is the filter on top of an engine called?

The filter on top of an engine is called an air filter. The air filter is a critical component of an engine that helps ensure efficient and clean combustion by removing dust, dirt, and other airborne particles from the air before it enters the engine.


Understanding the Role of the Air Filter


The air filter is responsible for cleaning the air that is drawn into the engine's intake system. This is important because the engine requires a steady supply of clean air to mix with the fuel for combustion. If the air entering the engine is contaminated with dirt, dust, or other particles, it can cause significant damage to the engine's internal components, such as the pistons, cylinders, and valves.


The air filter is typically located at the top or front of the engine, where it can easily capture the incoming air before it reaches the engine's intake system. The filter is made of a porous material, such as paper or foam, that traps the particles while allowing the clean air to pass through.


Types of Air Filters


There are several different types of air filters used in engines, each with its own advantages and disadvantages:



  • Paper Air Filters: These are the most common type of air filter, made of pleated paper material that effectively traps larger particles. They are relatively inexpensive and easy to replace.

  • Foam Air Filters: These filters are made of a porous foam material that can capture smaller particles than paper filters. They are often used in high-performance or off-road vehicles.

  • Oiled Air Filters: These filters are coated with a thin layer of oil, which helps them capture even smaller particles. They are more effective than paper or foam filters but require more maintenance.

  • Reusable Air Filters: Some air filters are designed to be cleaned and reused, rather than replaced. These are often made of a washable material, such as cotton or synthetic fabric.


Regardless of the type, it is important to regularly inspect and replace the air filter to ensure optimal engine performance and longevity.

Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.