What is VVA?


All internal combustion engines use valves to control the flow of gases into and out of the combustion chamber.  The precise timing, duration and extent to which these valves open significantly affects all aspects of engine performance – from power and torque to fuel economy and emissions.

With fixed valve events, it is impossible to optimise an engine’s performance over the complete range of operating conditions without significant compromise.   Variable valve actuation removes this constraint by allowing us to change the valve event to give optimum performance whenever it is required.







The impact of valve events on engine performance and emissions