(VVT) Variable Valve Timing - Improves Low And High Speed Torque
(VVT) Variable Valve Timing – Improves Low And High Speed Torque

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Variable Valve Timing (VVT) – Basic Generic OBD-II Fault Codes

(VVT-i) – Variable Valve Timing – How Does It Work

(VVT) – Variable Valve Timing – Function – Types – Failure Signs


So, Variable Valve Timing (VVT) systems use all sorts of sensors. But, The most important are the camshaft and crankshaft position sensors. Also, The (ECU) uses these sensors to monitor the relationship between the piston’s location and the valves’ positions. So, With the information from the crankshaft and camshaft sensors, the (ECU) can learn how fast the engine is rotating. Also, Including the relative positions of the pistons and valves.

Furthermore, It is computer-controlled and typically uses oil pressure to change the position of a phaser mechanism. Consequently, Located on the end of the camshaft, to advance or retard camshaft timing.

On DOHC engines changing the timing of one camshaft also changes the effective duration and overlap. (VVT) can also change total valve lift. Consequently, On engines where (VVT) also involves activating extra cam lobes or changing the rocker arm fulcrum point.

So, (VVT) can even change an engine’s effective compression ratio. Consequently, By altering the opening and closing points of the intake valves during the intake and compression strokes. If that weren’t enough (VVT) can also reduce pumping losses at idle for increased engine efficiency and fuel economy.

So, The advantage is that, all of the factors traditionally associated with a given cam grind are no longer fixed. But, Can change in response to changing engine speed and operating conditions.

Finally, By varying valve lift and duration, the engine can breathe freely like a diesel. Consequently, With minimal pumping losses at idle and low (RPM). This boosts fuel economy about 10% while also lowering emissions.

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