Why is the crankcase breather hose important to engine performance?

When the engine is running, the high-pressure gas in the combustion chamber will enter the crankcase through the gap between the piston rings. This phenomenon is called "blow-by". These gas accumulations will cause the internal pressure of the crankcase to increase, which may cause problems such as oil leakage and oil pan deformation. As a key component of the PCV system, the crankcase breather hose can timely introduce these blow-by gases into the intake system for secondary combustion.

The working principle of the crankcase breather hose is to maintain a slightly negative pressure state inside the crankcase. By continuously discharging excess gas, the crankcase breather hose effectively prevents pressure accumulation and protects the sealing performance of the engine. Without the normal operation of the crankcase breather hose, the engine may have various faults due to pressure imbalance.

Blow-by gases contain harmful components such as fuel, water vapor and acidic substances, which will contaminate the engine oil and reduce the lubrication effect. The role of the crankcase breather hose is to discharge these pollutants in time and keep the engine oil clean. Through the continuous operation of the crankcase breather hose, the formation of sludge and carbon deposits can be significantly reduced.

The exhaust function of the crankcase breather hose is crucial to the life of the engine. When the crankcase breather hose works properly, it can effectively prevent acidic substances from corroding metal parts and avoid premature deterioration of the engine oil. Regularly checking the unobstructedness of the crankcase breather hose is an important measure to ensure the long-term stable operation of the engine.

The crankcase breather hose re-introduces the combustible gas in the crankcase into the combustion chamber. This design brings multiple benefits. First, the crankcase breather hose recovers unburned fuel and improves fuel utilization; second, through the function of the crankcase breather hose, the generation of harmful emissions is reduced.

When the crankcase breather hose is blocked, it will cause the mixture ratio to be unbalanced, affecting the engine performance. Keeping the crankcase breather hose unobstructed can ensure that the engine obtains the best air-fuel ratio, thereby maintaining good power output and fuel economy. Although the crankcase breather hose is small, it has a significant impact on the overall efficiency of the engine.

The failure of the crankcase breather hose will cause a series of problems. If the crankcase breather hose is clogged, crankcase pressure will increase abnormally; if the crankcase breather hose is broken, unfiltered air will enter the engine. Both of these problems can cause serious engine damage.

It is very important to check the condition of the crankcase breather hose regularly. Checking the crankcase breather hose for aging cracks, whether the connection is firm, and whether the internal flow is smooth can prevent major repairs. Replacing an aged or damaged crankcase breather hose is one of the most cost-effective engine maintenance measures.