How does it work?
The main purpose of the Air Filter is to remove harmful dirt particles from the
Intake Air by introducing a filter media between the Air Intake and the entry
into the cylinder(s), in Petrol Engines prior to the carburettor. The Air is
directed through a Filter Cartridge that normally features a Pleated Paper
element. However other media is used dependent on the Filtration Efficiency
required, space available, cost etc. The amount of airborne contaminant
reaching the filtration element can also be reduced by introducing different
stages into the Air Filter Housing, and directing the airflow.
Positioning the Air Inlet Tube to avoid the worst effects of water ingress is
also part of the overall design brief. In Commercial Vehicle Air Filters the
housing may contain a water dump valve as part of the Air Filter Housing
design. The Air filter Housing and Inlet Tubing is also often designed to carry
Air intake Temperature control sensors and valves. Regulation of Intake Air
temperature is an important part of controlling efficient combustion and
therefore exhausts emission quality and is now commonplace on Petrol engines.
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