Continuous variable valve timing

Continuous variable valve timing (CVVT) or VVT with some manufacturers is an automotive technology that allows the intake and/or exhaust valve timing to be infinitely varied during engine operation throughout the RPM range. There are no discrete stages for affected components, as in the VTEC-style system which operates after the threshold RPM.

Implementations

• Alfa Romeo - Double continuous variable valve timing. CVVT is used on inlet and exhaust valves.
• BMW - Double VANOS.
• BMW/PSA Peugeot Citroën - Continuous variable valve timing (CVVT)
• Chrysler - dual Variable Valve Timing (dual VVT). Used on Chrysler GEMA "World" engine.
• Daihatsu - Dynamic variable valve timing (DVVT)
• Ford - Variable valve timing (VVT)
• General Motors - Variable valve timing (VVT) provides continuous variable valve timing.
• Geely - Continuous variable valve timing (CVVT)
• Honda - The i-VTEC system uses VTC (Variable Timing Control) to provide continuous timing variation of the intake camshaft on DOHC i-VTEC engines.
• Hyundai/Kia - Continuous variable valve timing (CVVT) - provides continous variable valve timing on Intake, Fuel System and Exhaust all independently controlled
• Mitsubishi - MIVEC system for the 4B1 engine family - intake and exhaust cam timing is continuously and independently controlled
• MG Rover - Variable Valve Control (VVC)
• Nissan - Continuous Variable Valve Timing Control System (CVTCS). The ECU adjusts the engine's timing continuously to prevent detonation/pinging and optimize gas mileage.
• Porsche - VarioCam and VarioCam Plus.
• Toyota - Variable Valve Timing with intelligence (VVT-i), Variable Valve Timing with Lift and Intelligence (VVTL-i).
• Volvo - Continuous variable valve timing (CVVT)

External links

• Powre Haus Powre Valvz
• UKCAR article
• BMW Double VANOS article
• allpar.com World Engine article
• Volvo CVVT article
• MG Rover VVC article
• MG Rover VVC article (from sandmuseum.com)
• Mechadyne VVA systems