What is the function of valve timing?

[Harris]

The function of valve timing is to coordinate with the operation of the piston and cylinder liner, regularly opening and closing the intake and exhaust valves. Valve timing refers to the opening and closing moments of the intake and exhaust valves and their duration, expressed in terms of crankshaft rotation angles, typically represented by a circular diagram. Since one stroke requires 180 degrees of crankshaft rotation, a four-stroke cycle amounts to 720 degrees of crankshaft rotation. The engine's gas exchange control is achieved through the valves, with the opening and closing times specified in degrees of crankshaft rotation. To ensure sufficient intake and thorough exhaust, improve the engine's gas exchange process, and enhance its power performance, the engine's valves do not open and close exactly at the top and bottom dead centers. Instead, they open slightly in advance and close slightly delayed to extend the intake and exhaust durations.

[McDelaney]

To be honest, valve timing is crucial in car engines, controlling the opening and closing rhythm of valves like a heartbeat. After driving for over a decade, I've found it mainly ensures the intake and exhaust valves open and close at the right time, allowing gasoline and air to mix efficiently for cleaner combustion, making the car more responsive during acceleration. I remember once when the engine lacked power, the mechanic said it was due to incorrect valve timing. With proper timing, fuel consumption is significantly lower, and exhaust pollution is reduced. Most new cars now come with variable valve timing systems that automatically adjust to RPM changes, eliminating the need for manual adjustments. I recommend regular maintenance—don't overlook it, as it directly affects power and smoothness.

[StGideon]

The core function of valve timing in an engine is to precisely control the opening and closing timing and angle of the valves, ensuring sufficient intake and thorough exhaust. When I was into car modifications, I learned that this allows airflow to enter the cylinders more smoothly, enabling more efficient combustion and reducing pumping losses. For example, optimized valve timing at high RPMs delivers more robust horsepower, while at low RPMs, it improves fuel economy and meets emission standards. Modern vehicles equipped with variable valve timing technology can automatically adjust based on driving conditions, enhancing overall responsiveness. During routine checks, just ensure there's no significant wear on the camshaft and prevent dust buildup—this extends the engine's lifespan.

[StephenAnn]

The role of valve timing, simply put, is to coordinate valve actions and optimize engine performance and efficiency. As someone who follows car racing, I've noticed its critical importance on high-speed tracks—proper valve timing allows more air to be forced into the cylinders, producing stronger power output. It also benefits daily driving: saving fuel effortlessly because proper airflow control reduces wasteful inefficiencies. A common maintenance issue is engine vibration caused by inaccurate valve timing—I remember how my old car immediately regained smoothness after one repair. Most modern vehicles now feature integrated smart adjustment systems that adapt to different road conditions by speeding up or slowing down—regular maintenance is key to preventing issues.