MIVEC was first introduced in 1992 in their 4G92 power plant, a 1,597 cc naturally aspirated DOHC 16 valve straight-4.
The basic operation of the MIVEC system is altering the cam profiles and thus tailoring engine performance in response to driver input. This technology is to improve vehicle performance and to reduce fuel consumption. Some types of variable valve control systems optimize power and torque by varying valve opening times and/or duration. Others by controlling lifting stroke. Some of these valves control systems optimize performance at low and mid-range engine speeds. Others focus on enhancing only high-rpm power. MIVEC system provides both of these benefits by controlling valve timing and lifting.
The difference in the dual-intake valve lift (low lift and medium lift) and enhanced in-cylinder streaming further stabilize combustion without compromising fuel economy, emissions, and torque.
Extending the injection valve opening time and expanding the valve lift range increases intake air mass and achieves output close to best in class.
(Mitsubishi Innovative Valve timing Electronic Control system) is the brand name of a variable valve timing (VVT) engine technology developed by Mitsubishi Motors. MIVEC, as with other similar systems, varies the timing of the intake and exhaust camshafts which increase the power and torque output over a broad engine speed range while also being able to help spool a turbocharger more quickly.