Air suspension with a lot of dust, these small particles suspended in the main ingredient is silica (Sio2) --- more than a hard metal material. Installation of air filter can reduce the cylinder, piston and piston rings and other parts of wear and tear. According to the information reported: If we do not install car air filter, cylinder wear and tear will increase 7-fold increase by 3 times the piston wear, an increase of 8 times the piston ring wear. Therefore, in the modern automobile engine carburetor (or EFI engine intake control device) equipped with front air filter.
In accordance with the filter principal, air filter can be divided into the filter, centrifugal, oil bath type, composite of several. At present, the engine air filter used in inertial main oil bath type air cleaner, dry paper air filter, air filter, such as polyurethane filter several. Inertial-type oil bath air filter has been carried out for the inertia-type filter, oil bath type filter, three-filter filter filter, the latter mainly through the two air filter filter filter filter. Inertial type air cleaner oil bath with a small intake resistance, and more able to adapt to the work of sand dust environment, the advantages of long life, in the past in a variety of models of cars, the engine of tractor use. However, this filter less efficient air filter, weight, and the high cost of maintenance of inconvenience in the automotive engine is gradually phased out. Dry-type air filter paper element of dealing with the adoption of resin made of porous filter paper, filter paper porous, loose, folded, a certain degree of mechanical strength and water resistance with high filtration efficiency, simple structure, light weight, low cost, easy maintenance, etc., is currently the most widely used for automobile air filter. Polyurethane air filter element of the filter using soft, porous, polyurethane sponge is made of strong adsorption capacity, the air filter with a dry-type air filter paper the advantages of low mechanical strength but, in the Car engines are more widely used. After the shortcomings of the two air filter is a shorter service life in harsh environment conditions unreliable.