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There is a positive crankcase ventilation system (PCV) inside the engine. The principle is to absorb the blowby formed in the crankcase through the negative pressure in the intake manifold, and then lead it to the combustion chamber to participate in combustion again. The blowby is mainly composed of oil vapor and combustible mixture. The oil is viscous. If it enters the intake pipe directly, it may stick to the wall of the intake pipe, which may cause carbon deposition to block the air intake. It seems that it can only be directly discharged into the atmosphere, but it is also because there are combustible gasoline molecules in the channeling time. If it is directly discharged into the atmosphere, it will damage the fuel economy and cause a more serious problem: air pollution. In response to the above problems, the oil catch can appears on the body of the refitted car. These small devices are installed between the PCV valve and the port of the intake manifold to capture oil and debris that may start to accumulate on the vehicle intake valve. They usually have filters that separate the oil from the air so that the oil settles at the bottom of the trap tank and does not spray back into the engine. This prevents carbon deposition on the intake valve. In this way, it is not only environmentally friendly, but also does not cause the air inlet to adhere to oil. It can only prevent the formation of carbon deposits, but not remove the carbon deposits.


Oil catch cans are simple devices that can greatly benefit direct-injected engines. They prevent oil and other contaminants from causing buildup inside your engine's intake manifold. Why does this specifically affect direct-injected engines? Well, The caking on intake valves is only a problem with direct injection engines. For all other engines that use port injection, the gas is introduced before the combustion chamber which means it flows over the intake valves and enter the combustion chamber premixed with the air. This action of the fuel flowing over the intake valves actually cleans the valves from any oil that make already be on there. The oil never has the chance to cake on the valves in port injection engines. Since direct injection engines shoot fuel directly into the cylinder, there's nothing preventing gunk from building up.

How to choose an oil catch can?

At present, there are three different types of oil catch cans: filter type, whirlpool type and empty shell type. Filter type, relatively complete filtration, the combustible gas recovered to the combustion chamber no longer has waste oil retention, the effect is the best, but due to the characteristics of this kind of filtering, the oil catch can is not particularly stable, so it is often necessary to observe the filtering effect to ensure the filtering function. Vortex type is actually a kind of gas channel composed of guide vanes to separate oil and gas. It is relatively reliable and stable to work. However, due to its working principle, the relative cost will be high. The other one is actually a shell without any separation process. It is only because the volume of the empty shell is larger than that of the pipeline. After the waste gas enters, the flow rate slows down, and the waste liquid will be precipitated.

Misunderstandings of oil catch can

1. Some people say that it's not easy to drain oil. The oil has to be put in hot car, otherwise the oil is thick, it is not easy to put. When unscrewing the filter pot, pay attention to the sealing gasket! 2. Some people are worried that the crankcase will be short of oil if there is so much oil filtered out of the filter pot. The original design of automobile oil gas cycle combustion system is good. It sucks the exhaust gas from the engine crankcase into the intake manifold for two times of combustion. However, in fact, the oil and gas in the manifold will be cooled and deposited into carbon deposit, and a small part of it can be burned in the cylinder. The original intention of installing the oil catch can is to reduce the amount of oil and gas entering the manifold, filter the oil and gas, and prevent it from entering the intake system to produce carbon deposition. Then the result is very clear, whether I install it or not, oil and gas will be generated. My filter pot is nothing more than changing the gas oil into liquid oil and collecting it. If the pot is not filled, part of the oil and gas will become carbon deposit and part of it will be burned, and it will also be gone. Some people say that you can save a pot of waste oil in two weeks. If you come down in two or three months, you will be short of oil. In fact, it's not exactly the oil that is filtered. Engine oil accounts for about 60% of the components. The filtered waste oil mainly contains 60-80% oil vapor, about 30% gasoline vapor passing through piston rings, and little water vapor. (there is plenty of water in winter, which is cold and hinders water. The composition of water can even account for more than 30%, so waste oil should be released as soon as possible in winter.)

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