VTEC
The technology Variable valve Timing and lift Electronic Control (electronic timer and progressive opening valves) Honda was designed to improve combustion efficiency. It was invented by the designer Ikuo Kajitani (Father of VTEC). The VTEC system provides a lot of power in high speed while maintaining the power and torque at low speed. The two valves “VTEC” have a tail valve into two parts, connected by a room filled with oil. A piston can increase or decrease the pressure in this room. When the pressure is low, the impetus given by the cam shaft is not transmitted to the valve: The valve remains closed permanently. This operation can be progressive (variable opening). When the pressure is high, the valve behaves like a valve “normal” in one piece: The valve opens like any other.
The VTEC system was introduced by Honda in its range of motorcycles in 1999 on the CB 400 Super Four. It was previously used on certain models of automobiles whose CRX and Integra. From 2002, the number of motorcycles VFR VTEC also has this system.
The first series of VTEC engine is the C30A (3.0l; 280cv) fitted to the NSX in 1989 The first VTEC engine “People” is the B16A1 (1.6l; 150cv), mounted in the CIVIC VT-I (EE9) and CRX VT-I (EE8) 91 … which will then be followed by B16A2 equipping 2 generations of Civic (EG6, EG9 and EK4) and CRX (EG2), from 1991 to 2000 and will be 1 engine series to have a performance (power / litre engine capacity) 100cv / l with 1.6l and 160cv!
Here is a video showing the functioning of VTEC: