In Indonesia, many new cars use engines with propulsion system valves, VVT-i, VTEC, valvetronik or VANOS. Toyota generally named engine VVT-I. While Honda VTEC named. VVT-i system VVT-i (Variable Valve Timing – intelligent) is a series of devices to control the camshaft drive. The point is to adjust the valve opening time with the condition of the engine. So that optimum torque can be obtained at each speed level. While saving fuel and reducing emissions. At Toyota engine, this system was applied to the intake valve. The exposure time can be varied over a range of camshaft 60 degrees. For example, at the start, a cold engine and stationary engine without load, timing pushed back 30 degrees. This method will eliminate the overlap. It events in and exhaust valves open simultaneously at the end of the disposal step for the new intake valve will open some time after the exhaust valve closes fully. Logically, in this condition the machine does not need to go the extra mile. With the closing of the exhaust valve, no fuel is wasted when sucked into the combustion chamber. So frugal fuel consumption and better engine friendly environment. Being when there is no load, the timing will be advanced 30 degrees. Degree of overlapping will increase. The goal is to help push the exhaust plus the fuel mixture and heat the incoming air. In addition, the compression time is also increased because the intake valve closing is also much faster. The effect, so better volumetric efficiency. To make it happen, no VVT-i controller on the timing on the intake camshaft gear. The tool consists of housing (home), then in which there is room to move the vane oil (the propeller). The propeller is connected to the camshaft. Inside are two oil lines to the oil each space in the house VVT-i controller. Different from the oil line is, vane will set the valve opening time. Advanced timing advance position gained by filling oil into the space behind each blade vane. So that the vane will move forward and position too advanced timing 30 degrees. Own the oil pressure supplied by the camshaft timing oil Control Valve regulated by the engine ECU. Conversely, for the conditions retard (backwards), the space in front of the vane and the position will be filled retreat timing. Meanwhile, if required in standard conditions, there was pin that will lock the vane position still there in the middle. Actually there are more sophisticated system, called VVTL-i (Variable Valve Timing Lift-Intelligent). In addition to playing a valve opening time, distinguished too high. Advanced technology VTEC Variable Valve Timing and Lift Electronic Controlled (VTEC) Honda innovation results showing different mechanisms. The main difference is the inclusion of valve movement. In the 16 valve engine, there are two each intake valve and exhaust in each cylinder. VTEC is applied only on the intake valve. At this valve controlling engine efficiency is more influential. The assumption, the process does not require the opening of the exhaust valve because the current variable exhaust, engine work will be more lightly. At VTEC engine, both intake valves do not always move together. For example, at low speed there is only one valve is open. Opening was relatively small because the characters are punched camshaft valve is suitable for low speed. This condition is considered fit for the machine. Due to the low speed does not need a lot of air supply. In addition, there could be air turbulence to help mix the fuel. Machine so economical, efficient, environmentally friendly as well. As the engine speed increased, the need for air supply is also increasing. Immediately answered with a second valve. Larger opening for not chamshaft has character degrees higher. Fun, first valve had come open wider. This is due to the pins that connect the rocker arm and the push pin. Automatic locking pin will last two rocker arm. Because these two rocker arm actuated by a camshaft duration not higher, so follow the movement of the first valve. In addition there is also VTEC i-VTEC (intelligent VTEC) which also features a mechanism to advance and rewind the ignition. Of maximize results to improve the efficiency of the machine.