Moment-double-valve technology (multi-valve), variable valve timing and valve timing (VVT) on the combustion engine is constantly changing.

Increasingly complicated

Toyota VVTi (Variable Valve Timing intelligent), the last Honda i-VTEC (Variable Valve Timing and Lift Electronic Control with intelligence), Suzuki VVT (variable), while Mitsubishi MIVEC (Mitsubishi innovative valve timing control valve of the electronic system) and VANOS (variable Camshaft Timing) BMW.

Toyota also has a ‘dual VVTi “played the system as a new machine which was introduced last year. In essence, as the area as Noken optimum spark advance degrees or rewind, or could allow also known that the opening of the intake valve on the fuel supply of the rapids.

In VVTi, the operating principle of this technology is the way Noken the right to move the camshaft forward and backward. Noken result was used to determine the degree of opening and closing the valve adjusts the speed to be determined.

If the engine speed is low grade, of course, there is no need to open and close the valve top. As fuel in the combustion chamber as needed only a few machines.

However, if the engine speed is higher VVTi sent the degree of opening and closing Noken no longer correspond to the fuel tank of the machine. As the solenoid valve works on controlled by oil pressure.

In the dual VVT-i engine, fuel and electricity are produced larger and more uniform. This is because the process of opening and closing the intake valve is not only, but also in the exhaust.

The goal of high-speed (acceleration of the exhaust valve opening), the fresh air and fuel are much faster (does not inhibit the exhaust).

All low-speed, time to close the valve quickly adjusts itself to the ‘drop’ a mixture of fuel and air for the new entry to be reduced. This is important to retain power, fuel consumption and emissions.