In internal combustion engines, variable valve timing (VVT) is the process of altering the timing of a valve lift event, 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 devic...
Found on
http://en.wikipedia.org/wiki/Variable_valve_timing
An engine feature that allows the lift, timing or duration of the engines valvetrain to be changed dynamically while it is in operation.
Found on
http://www.edmunds.com/glossary/
No exact match found.
