These designs of using the engines own vacuum to keep pressure down in the crankcase does have its downside. Below are examples of the check valves you will need: Some OEM manufacturers have run vent lines to other area’s of the intake pre-throttle body, but you will notice that they install check valves on these lines so that once the car or truck engine makes boost the check valve will close and pressure will not have access to the valve cover or crankcase. In forced induction applications the lines are usually run to the intake tube before the turbo or superchargers intake, where they will be subject to vacuum the entire time the engine is running. They are always pre-throttle body so that they are always seeing vacuum. Therefor engine manufactures want to make sure that a small amount of vacuum is always applied to the crankcase and valve covers.Ī factory designed crank case pressure system will usually just have a couple of lines that run from the valve covers and crank case over to the intake in some area.
Read our article on dry sump systems to find out more information on this. In fact, running a small amount of negative pressure actually shows an increase in engine power. This reduces the ability of the rings and other seals to do their job. This pressure often gets into the crankcase as some of the cylinder pressure gets past the rings or from the piston travel itself and then moves on into the valve cover. As a piston goes up and down in the cylinder it creates pressure areas both in the cylinder and the crankcase as the speed of the piston itself in its return stroke is moving a lot of air. While most people understand that a forced induction motor (one that is turbo or supercharged or bottle fed) has pressure many don’t know that N/A motors do as well. No matter what, a good catch can will have some sort of aerator or separator located inside. Some of them will have breathers on top, while others will be a closed system. These cans are sometimes large and others times not so much. Know-it-all! What is a catch can?Ī catch can is a container that is plumbed into the car engine in a manor that will catch oil vapors. You’ll learn something you probably didn’t know Mr. This article will talk about what a catch can is and why you should be running one. It seems like every company out there now is offering a catch can set-up for a certain car or truck and there is good reason. Why every car/truck, especially force induction cars, should be running a catch can
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