VVTjärjestelmät

VVTjärjestelmät, short for Variable Valve Timing systems, are an automotive technology that optimizes engine performance and fuel efficiency. These systems allow the engine's valve lift and timing to be adjusted while the engine is running. By altering when the intake and exhaust valves open and close, VVT systems can improve volumetric efficiency across a wider range of engine speeds. This leads to better torque delivery at lower RPMs and increased horsepower at higher RPMs.

The primary benefit of VVT is enhanced fuel economy. By optimizing valve timing, the engine can burn fuel more completely, reducing emissions and improving efficiency. Another advantage is a smoother engine idle and a broader power band, making the vehicle more responsive and drivable in various conditions. Different manufacturers employ various VVT technologies, such as variable intake timing, variable exhaust timing, or a combination of both. Electronically controlled systems are most common, using sensors and actuators to precisely manage valve timing based on engine load, speed, and temperature.

The implementation of VVT systems has become widespread in modern internal combustion engines due to its significant advantages in performance and environmental impact. It is a key component in meeting increasingly stringent fuel economy and emissions regulations.