What's wrong with the OEM PCV valve? The short answer is nothing as long as you never reach maximum boost of the factory tune. Throughout the life of the catch can, the perforated filter plates will never break down or need to be replaced like catch cans with screens and mesh filter material. Oil that accumulates on the filter plates runs off and is collected in the bottom where a large 5/8" quick drain makes emptying the catch can a breeze. As the gases flow through the plates, the oil sticks and the gas is all that reaches the outlet at the top of the catch can. The oil then begins to fall out of suspension as it flows through a series of 3 perforated filter plates. This is why an OCC is a must have for the Ford Focus RS.Īs the PCV gases enter the catch can a pressure drop occurs. This is especially a problem for the 2.3L motor because there's no fuel (Direct Injection) passing over the valves to wash and keep them clean. Over time a thick crust forms significantly reducing performance and potentially leading to a costly cleaning or repair. Before ever making it into the cylinders, some of that oil mist and other contaminates adhere to the backside of the hot intake valves. ![]() Details: During everyday engine operation, blow-by gases, as well as oil vapor from the engines rotating assembly, pass through the PCV valve and are routed into the intake for the engine to burn off.
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