The vacuum also allows leftover combustion gasses to be recirculated and burned again, making for a more environmentally friendly vehicle and less sad dolphins. The longer these vapors stay in the crankcase, the more likely they will condense, causing damage to internal engine components and thinning the oil. This vacuum helps clear oil and, more importantly fuel vapors, from the crankcase faster. Many modern PCV systems utilize intake vacuum to pull blow-by from the crankcase, in the case of the BMW N55, blow-by is routed before the turbo.Īnother issue with simply venting the catch can to atmosphere is the fact that most modern crankcase ventilation systems are under vacuum from the intake manifold. Even if your state doesn’t perform emissions inspections, venting a PCV system that is not vented from the factory is prohibited by federal law in the United States. In most states a catch can that is vented to atmosphere will not pass inspection. While this may seem like the best solution, it’s not very nice to the polar bears, and there are some legal issues associated with it as well. This method completely eliminates the possibility of blow-by being recirculated into the intake. Some catch cans simply have one line coming from the crankcase to the can and then use a small breather filter to allow pressure to vent out of the top of the can. However, how that is done is a controversial topic. It makes sense that a catch can would still have to allow blow-by gasses to be vented from the crankcase after all, that’s the entire purpose of the PCV system.
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