What type of crankcase breather system do modern engines incorporate?

Modern engines typically incorporate a closed crankcase breather system. This system allows for better control of emissions and maintains pressure equilibrium within the crankcase. The basic function of a closed system is to recirculate gases that escape from the crankcase back into the intake manifold, where they can be burned during combustion rather than being released into the atmosphere.

This design not only helps in reducing harmful emissions but also aids in maintaining the efficiency of the engine. By preventing the release of crankcase vapors, the closed system mitigates the risk of particulate and smoke pollution that can occur with open systems, which simply vent to the atmosphere. Additionally, it helps to improve engine performance by ensuring that the engine can operate under optimal conditions without the interference of crankcase pressure fluctuations.

Overall, the implementation of a closed crankcase breather system aligns with modern environmental regulations and efficiency standards in the automotive industry.