There are generally two types of air filters: paper and oil bath. Due to the advantages of high filtration efficiency, light weight, low cost, and easy maintenance, paper filters have been widely adopted. The filtration efficiency of paper filter cartridges is over 99.5%, while the filtration efficiency of oil bath filters is 95-96% under normal conditions. The widely used air filters on cars are paper filters, which are divided into dry and wet types. For dry filter elements, once immersed in oil or water, the filtration resistance will sharply increase. Therefore, it is important to avoid contact with water or oil during cleaning, otherwise a new component must be replaced.
When the engine is running, the intake air is intermittent, causing air vibration inside the air filter housing. If the air pressure fluctuates too much, it can sometimes affect the engine's intake air. In addition, this will also increase the intake noise. In order to suppress intake noise, the volume of the air filter housing can be increased, and some even have partitions arranged in it to reduce resonance.
The filter elements of air filters are divided into two types: dry filter elements and wet filter elements. The dry filter element material is filter paper or non-woven fabric. In order to increase the air passage area, filter elements are mostly processed into many small wrinkles. When the filter element is slightly damaged, compressed air can be used to blow it clean. When the filter element is severely damaged, a new core should be replaced in a timely manner.
The wet filter element is made of sponge like polyurethane material. When installing, some engine oil should be added dropwise and kneaded evenly by hand to absorb foreign objects in the air. If the filter element is dirty, it can be cleaned with cleaning oil, and if it is excessively dirty, it should be replaced with a new filter element.
If the filter element is severely blocked, it will increase intake resistance and decrease engine power. At the same time, due to the increase in air resistance, it will also increase the amount of gasoline sucked in, resulting in a rich mixture ratio, which can worsen the engine's operating state, increase fuel consumption, and easily cause carbon deposition. You should develop the habit of regularly checking the air filter element in daily life.