Posted on 5/4/2023
VVT (Variable Valve Timing) and VVL (Variable Valve Lift) Systems Many modern vehicle manufacturers incorporate VVT (Variable Valve Timing) and/or VVL (Variable Valve Lift) systems in their engines to gain maximum fuel efficiency while maintaining power output and smooth engine operation. To understand how this technology benefits the driver, we need to understand the basics of engine operation. A vehicle engine is essentially an air pump that controls the explosion from a fuel/air mixture and transfers the explosion energy into rotating movement. Thus, propelling the vehicle forward. Nearly all vehicle engines use the four stroke, Otto engine design. See illustration. The valves control the flow of air/fuel into the cylinder and the exhaust out of the cylinder once the combustion process takes place. They must be timed to open and close at precisely the correct points of crankshaft rotation to maintain engine op ... read more