Variable valve timing

Cylinder head of Honda K20Z3. This engine uses continuously variable timing for the inlet valves

Variable valve timing (VVT) is the process of altering the timing of a valve lift event in an internal combustion engine, and is often used to improve performance, fuel economy or emissions. It is increasingly being used in combination with variable valve lift systems. There are many ways in which this can be achieved, ranging from mechanical devices to electro-hydraulic and camless systems. Increasingly strict emissions regulations are causing[1] many automotive manufacturers to use VVT systems.

Two-stroke engines use a power valve system to get similar results to VVT.

  1. ^ US EPA, OAR (9 September 2016). "Regulations for Greenhouse Gas Emissions from Passenger Cars and Trucks". www.epa.gov. Retrieved 12 July 2022.