What does VVT mean?
2 Answers
VVT stands for Variable Valve Timing in engines. Here are the relevant details: 1. DVVT: The DVVT engine is an advancement of VVT, addressing technical challenges that VVT engines couldn't overcome. DVVT, or Dual-Variable-Valve-Timing, represents the most advanced form of variable valve timing system technology currently available. The DVVT engine operates on a principle similar to the VVT engine, utilizing a relatively simple hydraulic cam system. However, while VVT engines can only adjust the intake valves, DVVT engines can adjust both intake and exhaust valves, offering superior characteristics such as high torque at low RPM and high power at high RPM, making it technologically leading. Simply put, it's like human breathing, capable of rhythmic control as needed. 2. VVT Technology: The VVT technology in Korean cars is derived from imitating Toyota's VVT and Honda's VTEC technologies from Japan. However, compared to Toyota's VVT-I variable valve timing technology, VVT only involves variable valve technology without the timing aspect. Therefore, while VVT engines are indeed more fuel-efficient than standard engines, they still fall short of the fuel efficiency offered by Japanese cars like Toyota and Honda.
When I first learned car repair, I also often confused these abbreviations. VVT stands for Variable Valve Timing system, which is like installing a smart switch for the engine. It adjusts the camshaft angle through oil pressure, allowing the valve opening and closing timing to change with the engine speed. For example, when you drive slowly, it delays closing the intake valve to let more exhaust gas escape from the cylinder, saving fuel and ensuring smooth operation. But when you floor the accelerator, it closes the valve early to lock the air-fuel mixture in the cylinder, boosting power. Nowadays, even the Wuling Hongguang uses this technology, but Japanese cars tune it most finely, while German cars focus more on high-RPM performance. To me, it’s like a breathing coach for the engine, constantly adjusting the breathing rhythm—it’s simply brilliant.
