What does variable valve timing technology mean

Variable valve timing (VVT) technology is an engine technology that improves air charge volume, increasing the charge coefficient, which allows for further enhancement of engine torque and power output.

The variable valve timing system is an electronically controlled mechanism that alters valve opening timing or duration. By optimising valve opening and closing timings across different engine speeds, it improves torque delivery consistency, boosts engine performance and reduces fuel consumption.

Conventional engine valve timing systems employ fixed camshaft phasing - a rigid mechanical system where valve opening and closing remain constant. Such systems struggle to meet varying engine demands across different operating conditions, failing to deliver optimal power output throughout the rev range.

Valves serve the specific function of admitting air into the engine and expelling exhaust gases post-combustion. Structurally, engines feature both intake valves (which draw air into the combustion chamber for mixing with fuel) and exhaust valves (which discharge burnt gases and facilitate heat dissipation).

From an engineering perspective, variable valve timing (VVT) is a method to fine-tune engine breathing. By altering valve lift and duration, it optimises airflow into cylinders. This adjustment is typically managed via hydraulic or electronic actuators that rotate the camshaft. The result? A broader powerband, fewer compromises between low-end torque and high-end horsepower, and cleaner combustion.