the BMW's VANOS.  The Toyota VVT-i system replaces the Toyota VVT offered starting in 1991 on the 5-valve per cylinder 4A-GE engine.  The VVT system is a 2-stage hydraulically controlled cam phasing system.VVT-i, introduced in 1996, varies the timing of the intake valves by adjusting the relationship between the camshaft drive (belt, scissor-gear or chain) and intake camshaft.  Engine oil pressure is applied to an actuator to adjust the camshaft position.Video animation of VVT-i (courtesy of PT. Toyota Astra Motor, Indonesia) can be found here [1].VVTL-i[සංස්කරණය]In 1998, Toyota began offering a new technology, VVTL-i, which can alter valve lift (and duration) as well as valve timing.  In the case of the 16 valve 2ZZ-GE, the engine has 2 camshafts, one operating intake valves and one operating exhaust valves.  Each camshaft has two lobes per cylinder, one low rpm lobe and one high rpm, high lift, long duration lobe.  Each cylinder has two intake valves and two exhaust valves.  Ea