![]() The above figure looks at wet and dry pressure drop at different flow rates. ![]() Vahid Golkarfard, Ramanathan Subramaniam, Jonathan Broughton, Andrew King, andīenjamin Mullins, Curtin University, Australia It breaks down the methods used, and analyzes other OEM and OEM style oil separators. The figures below show the results of 3 aftermarket catch cans compared to a highly effective OE version. This test was performed on diesel vehicles, but still provides insight into the overall effectiveness of aftermarket catch cans. Open catch cans in particular (those without any filtration or baffling) are extremely ineffective. But, how well they work depends a lot on the design of the catch can.Ī paper published by SAE found that based purely on filter quality, airflow drop rate, and particle capture efficiency, aftermarket catch cans fell far below OEM and OEM style systems. When considering whether or not they catch and collect particles from engine blow-by, then yes, they do work. The clean air makes its way out and enters the intake with less harmful particles. the oil vapor and other contaminants from engine blow-by are condensed or absorbed, remaining in the bottom of the catch can. Inside, the air is forced through a system of baffles, filter, or an open container depending on the design. Air and particles enter the catch can when they are purged from the crankcase via the PCV valve. Oil catch cans capture vaporized oil, fuel, and other particles, condensing them into a liquid. Oil catch cans collect and condense the vapor into a liquid, reducing the amount entering the intake. ![]() These particles may contaminate the air-fuel mixture in the cylinder, reducing power output. The harmful vapors that are purged from the crankcase can cause carbon buildup on the intake valves and manifold, a dirty throttle body, and liquid in the intercooler on vehicles with forced induction. While the PCV system keeps harmful vapors out of the crankcase, saving the engine from acidic oil, excessive crankcase pressure, and damage from water condensation, it’s not foolproof. ![]() The PCV (Positive Crankcase Ventilation) valve redirects this vapor out of the crankcase and back into the intake. On an engine’s combustion stroke, a small amount of vaporized air, fuel, and oil makes it past the piston rings and enters the crankcase. The goal of an oil catch can is to intercept fine oil particles in the PCV system before they are recirculated through the engine intake. Are catch cans better at preventing carbon build-up than the systems cars come with from the factory? Read on to learn the function of an oil catch can and see if it’s worth installing one on your car! What Does an Oil Catch Can Do? Oil catch cans are a popular modification on high performance and tuned vehicles, but there is a lot of speculation and general confusion as to what they do and whether or not they work. ![]()
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