![]() ![]() Therefore, the purpose of a catch can is to help minimize this buildup the only thing passing through the intake should be clean air. Given time, this can lead to buildup on the valves and preventing them from fully closing. With direct injection feeding gasoline straight into the combustion chamber, the gasoline does not have the opportunity to clean the intake valves. This is especially bad on direct injectors cars, such as the FA20 WRX. The problem is that oil vapors will often condense in this process, resulting in liquid oil that can gunk up sensors, dirty intake valves, and result in poor performance. For emissions standards, this is directed back into the intake so that any harmful fumes or oils can be burnt off in combustion. The crankcase of your engine has a one way valve which diverts excess gaseous air pressure from building within the engine. ![]() A catch can is traditionally a can or container which captures oil that passes through the crankcase ventilation system of the engine.
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