Variable Valve Timing (VVT) systems advance or retard the timing of the engine's valves to optimize engine performance across different speeds and loads. Advancing VVT effectively opens the intake valves earlier, which can boost power at higher engine speeds. 111 ste Retarding VVT opens the intake valves later, which can improve fuel economy and reduce emissions at lower speeds. #vvt #mechanism #timing #mechanical #enginework #usaengine #usamechanic #usareels #ngkcoils #usaautomobile #IgnitionCo