Variable Valve Timing Components

Variable Valve Timing Solenoids

Variable Valve Timing Solenoids Learn More >

Camshaft Gears

Camshaft Gears Learn More >

How Does The Variable Valve Timing System Work?

For piston engines, VVT system usually takes in and out air by lifting the throttle valve, which is driven directly or indirectly by the cam on the camshaft. In each intake and exhaust cycle, the cam drives the valve to open for a certain time.

At high speed, the engine needs more air, but the intake valve may close before the required air fully enters, resulting in reduced performance. Therefore, the timing of valve opening and closing is very important. The continuously open valve will cause the fuel to be discharged from the engine without combustion, which will reduce the performance of the engine and increase exhaust pollution. So the idle speed of the competition engine cannot be too low. On the other hand, if the cam keeps the valve open for a long time, as in the case of racing cars, problems will occur at lower speeds.

The crankshaft drives the camshaft through timing belt, gear or chain. The contour and position of the cam on the camshaft are usually optimized for specific engine speed, which usually reduces the torque of the engine at low speed and the power at high speed. Variable valve timing system technology can make it change according to the engine working conditions, and improve the efficiency and power of the engine.

How To Wire Points Variable Valve Timing System?

VVT components system consists of ECU, variable valve timing solenoids, VVT actuator, VVT sensor, etc. According to the parameters from VVT components, camshaft speed sensor, intake air flow, throttle position and engine coolant temperature, ECU transmits duty cycle control signal to VVT Solenoid assembly to adjust the oil pressure supplied to VVT actuator.