What is the primary function of closed crankcase ventilation systems?

The primary function of closed crankcase ventilation (CCV) systems is to aid in the prevention of air contamination. These systems are designed to manage the gases that accumulate in the crankcase by rerouting them back into the intake system to be burned in the combustion process rather than allowing them to escape into the atmosphere. This helps minimize the release of harmful pollutants, thus improving air quality and adhering to environmental regulations.

While there are benefits associated with the use of CCV systems, such as potential indirect improvements in fuel efficiency and oil circulation, those are secondary effects rather than the primary purpose. The reduction of engine weight does not directly relate to the function of closed crankcase ventilation systems. Hence, focusing on the prevention of air contamination captures the main objective behind implementing these systems in modern engines.