The two main ones, when it comes to varying the distribution, are: Depending on the engine, VVT configurations are differentiated and can be run only on the intake valves or on both camshafts. There are different types of timing that have unique characteristics, the main difference being in the placement of the camshaft. To obtain the maximum efficiency of the engine, the valves must open and close depending on the revolutions per minute at which it is turning, and this is only possible if we have a variable timing. Filling the VVT gear with oil unlocks its stationary pin and makes it two independent rotating parts, causing angular displacement between the input (chain) and output (camshaft), advancing, or retarding the timing. Oil pressure is sent through the VVT gear to fill up cavities to advance or retard timing. This VVT system is controlled by the ECU, the electronic control unit that regulates the engine and is responsible for activating this gear through the flow of engine oil. Its main function is to modify the phase angles of the distribution diagram, adjusting the camshaft according to the needs of the moment. That’s where variable valve timing comes in. Keep reading to find out in more detail how this system works and what it is made of.Īs a rule, when more revolutions our engine has, more air is needed by cylinders. This is possible by a phaser located on the camshaft head called Variable Valve Timing (VVT) System. With the arrival of increasingly complex engines, which state at high revolutions per minute (RPM) and need all their power to idle, it is necessary to be able to advance the opening and closing times of the intake and exhaust valves precisely at any engine speed.įor this reason, variable valve timing was created, a system that aims to alter the opening and closing time of the air intake valves (or exhaust gases) so that the optimum amount of air for the process enters the cylinders.
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