Variable timing Valves

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VTVT - Stands for Variable Timing Valve Train, the technology is used in most top variants of the cars. Hyundai has the technology applied to their Hyundai Verna, i20 and i10 models. VTVT has the ability to have independent control of the intake and exhaust valves in an internal combustion engine. The timing of intake and exhaust will be independently programmed in different engine load criteria basically same as VVT.

VVT/VTEC - Variable Valve Timing, term used in petrol, diesel and CNG engines. It defines the timing for which valves are opened. VVT controls the lift, duration or timing of the intake and the exhaust valves. In non-VVT engines, this process of controlling the lift, duration or timing of the intake and the exhaust valves was controlled by a set of cam shafts and belt mechanisms. It would open and close the valves at set angle of the position of the crankshaft and would then close at the same set angle. The engine wouldn’t perform at peak with this old technology as the timing would vary.

The valve timings vary in a VVT engine with keeping in sync the engine speed ensuring the valves opening as per the need of the engine load. All this actually brings about a change and improvement in the engine efficiency, power, and performance.

VVTi - Variable Valve Timing with intelligence uses some microprocessors to control the VVT functionality, first developed by Toyota. It simply varies the timing of the intake valves by some corrections and adjustments in the functioning and mechanism between the camshaft drive and the intake camshaft. Engine oil pressure is applied to the actuator for adjusting the camshaft position. Higher efficiency is achieved from the engine by making adjustments in the overlap time in between the opening of intake valves and closing of exhaust valves.

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