VVEL

VVEL stands for Variable Valve Event and Lift, a valve-control technology developed by Nissan and used on some Infiniti and Nissan engines. It is designed to optimize the intake valve’s timing and the amount the valve opens, with the goal of improving engine breathing across a wide range of speeds and loads. By adjusting both when the valve opens and how far it lifts, VVEL aims to deliver better low- and mid-range torque, smoother throttle response, and improved efficiency without requiring a completely different camshaft profile.

The core idea of VVEL is to vary the effective cam profile through a hydraulic or mechanical actuator that changes the relationship between the camshaft and the valve train. This allows the engine control unit to select different valve events for different operating conditions, such as idle, cruising, or high-load acceleration. In practice, the system coordinates valve opening timing with valve lift to optimize airflow into the cylinder, reducing pumping losses at low rpm and increasing charge motion at higher rpm.

VVEL has been implemented on various Nissan and Infiniti engines since the late 2000s, often in combination with other variable valve technologies. It is distinguished from simple variable timing systems by its additional capability to vary valve lift, providing a broader range of breathing optimization. Potential trade-offs include added complexity, weight, and maintenance considerations, balanced by gains in performance and efficiency.

Overall, VVEL represents an approach to engine breathing that seeks to enhance power delivery and efficiency by dynamically altering both when and how much the intake valve opens.