Next, determine where you will mount the catch can.Īll of our catch cans are assembled with the feed (inlet) on the left and the return (outlet) on the right. When installing your catch can, first identify the components of your PCV system and determine where you will locate the feed and return lines. Special crankcase ventilation methods are required in boosted engines, such as more sophisticated oil separation devices and/or catch cans. Turbocharged engines pose special problems since boost pressure increases blow-by volume and can easily turn manifold vacuum into boost pressure greater than crankcase pressure, disrupting normal PCV flow. This reduces oil consumption and protects sensors and catalytic converters from contamination, however in many cases they are not completely successful at removing all of the oil.
To minimize the amount of liquid oil drawn through the PCV valve, many modern engine designs – including those from Euro car manufacturers, now include a separator that removes liquid oil from recirculated gases and returns it to the crankcase before it can be sucked back into the intake. More importantly, the system replaces blow-by contamination with fresh, filtered air that dilutes contamination to reduce concentrations of acids, oxidants, and water in the engine oil. The modern PCV system draws these harmful blow-by gasses and vapors back to the intake plenum where they make up a small part of the combustion air charge. This was not only polluting the atmosphere but was inefficient and left a lot of raw blow-by gas and water inside the crankcase, where it quickly contaminated the engine oil, creating sludge and oil breakdown. Pre-PCV cars vented crankcase pressure to the atmosphere through a vent pipe or mesh restriction, commonly located in the oil fill cap. The fuel and water also contaminate the engine oil. If the pressure gets too great, it will push engine oil past seals and gaskets causing multiple oil leaks. These blow-by gasses will accumulate and build pressure inside the crankcase. The gas contains exhaust fumes, raw fuel, and water. Some combustion gas blows past the rings into the crankcase on each power stroke.
PCV, or Positive Crankcase Ventilation, is an emission control which has been mandated for use since the 1960’s. We will begin here with a quick run-down of the PCV system.
OIL CATCH CAN INSTALL
In order to properly install a catch can on any application, you must first have a basic understanding of the PCV system operation on your car so you can determine the correct position of the feed and return lines.
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