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The check valve helps to prevent boost past the PCV valve, thus reducing crankcase pressure and blow-by out of the valve cover Entrained oil in blow-by captured by the OCC To learn more about how our OCC kit prevents oil from recirculating into the intake, click here, and select your car. A check valve is in place to prevent boost from entering in the system, mainly to prevent it from reaching past the PCV valve. Here we have our standard Oil Catch Can kit setup: An OCC is put in place between the intake manifold port and PCV valve, to capture the entrained oil in the blow-by. Stock cars or vehicles with little modifications, where the effects of oil contamination are not a concern to the owner PCV valve prone to leaking can further increase crankcase pressure

Does not address excess crankcase pressure on high boost, tuned cars Entrained oil in blow-by allowed into the intake manifold, and intake tract Sufficient to maintain proper crankcase evacuation for a stock, or lightly modified engines Some of the pressure can make it past the valve, and into the crankcase. However, the factory PCV valve may leak under boost, as there is not a true seal in the valve. Under boost, the intake tube pulls a slight vacuum onto the crankcase, and the PCV valve attempts to prevent boost pressure from entering the crankcase. The PCV valve meters the flow of air on the crankcase, getting a fresh air source via the valve cover to intake connection. Under vacuum the intake manifold pulls a vacuum on the crankcase via the PCV valve. To show what can be done to avoid excessive oil in the intake, and to relieve excess crankcase pressure, here’s some diagrams of common oil catch can set-ups, including set-ups with additional crankcase ports, via a PCV plate.įirst let’s look at the stock system under both boost and vacuum.