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Message: <blockquote data-quote="mohalw" data-source="post: 1622693" data-attributes="member: 13563">VTEC (standing for Variable valve Timing and lift Electronic Control) is a system developed by the car manufacturer Honda to improve the combustion efficiency of its internal combustion engines throughout the RPM rangeMIVEC (Mitsubishi Innovative Valve-timing-and-lift Electronic Control) is an automobile variable valve timing technology developed by Mitsubishi. MIVEC varies the lift of valves by using two different camshaft profiles. It is similar to Honda's VTEC system. VVT-iVVT-i, or Variable Valve Timing with intelligence, is an automobile variable valve timing technology developed by Toyota. The Toyota VVT-i system replaces the Toyota VVT offered starting in 1991 on the 4A-GE 20-Valve engine. The VVT system is a 2-stage hydraulically controlled cam phasing system.VVTL-iIn 1998, Toyota started 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. Each set of two valves are controlled by one rocker arm, which is operated by the camshaft. Each rocker arm has a slipper follower mounted to the rocker arm with a spring, allowing the slipper follower to move up and down with the high lobe with out affecting the rocker arm. When the engine is operating below 6000 rpm, the low lobe is operating the rocker arm and thus the valves. When the engine is operating above 6000 rpm, the ECU activates an oil pressure switch which pushes a sliding pin under the slipper follower on each rocker arm. This in effect, switches to the high lobe causing high lift and longer duration.So, is that enough clear?? :regular_smile:</blockquote>

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