How does the PCV Hose Combination regulate the pressure in the engine?

The PCV Hose Combination regulates the internal pressure of the engine through a sophisticated mechanism to ensure that the engine runs efficiently and environmentally friendly. The PCV valve, as the heart of the PCV Hose Combination, is a one-way flow control valve that can automatically adjust the gas flow between the crankcase and the intake manifold according to the engine operating conditions. Its core design is to balance the internal pressure of the crankcase, prevent oil vapor and incompletely burned fuel vapor from escaping into the atmosphere, and guide these gases back to the combustion chamber for secondary combustion, thereby reducing harmful emissions.
When the engine is idling or under low load, the vacuum in the intake manifold is high, which attracts the PCV valve to open, allowing the mixed gas in the crankcase (mainly composed of oil vapor, fuel vapor and a small amount of air) to flow into the intake manifold through the PCV hose, and then be sucked into the cylinder for combustion. This process helps to maintain the stability of the pressure in the crankcase and prevent the accumulation of oil vapor from causing oil deterioration or leakage. When the engine is under high load or accelerating, the vacuum of the intake manifold decreases, and the opening of the PCV valve is reduced or completely closed accordingly to reduce the amount of crankcase gas entering the intake manifold and prevent the combustion efficiency and power output from being affected by excessive unburned mixture entering the cylinder.
As a bridge connecting the crankcase and the intake manifold, the PCV hose must have good flexibility and sealing to ensure smooth and unobstructed gas flow while preventing gas leakage. High-quality hose materials can withstand the high temperature, oil stains and vibration environment in the engine compartment and maintain long-term reliability.
Through the precisely designed hose path and diameter, the PCV hose not only transmits gas, but also participates in regulating the pressure balance between the crankcase and the intake manifold. Reasonable hose layout helps to reduce gas flow resistance and improve the overall efficiency of the PCV system.
The PCV hose combination effectively reduces crankcase emissions, which is crucial to meeting increasingly stringent environmental regulations. By reintroducing crankcase gas into the combustion cycle, the emission of harmful substances such as HC (hydrocarbons) and CO (carbon monoxide) is significantly reduced.
By maintaining a stable crankcase pressure, the PCV Hose Combination helps reduce oil consumption, keeps the oil clean, and thus extends engine life. At the same time, it reduces the accumulation of oil mist and gas in the crankcase, improves the engine's intake efficiency, and improves fuel economy and power performance.