![]() The VTEC system provides the engine with valve timing optimized for both low and high RPM operations. A third option is to change the cam timing profile, of which Honda VTEC was the first successful commercial design for altering the profile in real-time. Another approach is the rotary engine used in the Mazda RX-7 and RX-8. One method for increasing performance into a static displacement includes forced induction, as with models such as the Toyota Supra and Nissan 300ZX which used turbocharger applications and the Toyota MR2 which used a supercharger for some model years. Japan levies a tax based on engine displacement, and Japanese auto manufacturers have correspondingly focused their research and development efforts toward improving the performance of their smaller engine designs. It is distinctly different from standard VVT ( variable valve timing) systems which change only the valve timings and do not change the camshaft profile or valve lift in any way. It was invented by Honda engineer Ikuo Kajitani. The VTEC system uses two (or occasionally three) camshaft profiles and hydraulically selects between profiles. VTEC (described as Variable Valve Timing & Lift Electronic Control, but stands for Valve Timing Electronically Controlled) is a system developed by Honda to improve the volumetric efficiency of a four-stroke internal combustion engine, resulting in higher performance at high RPM, and lower fuel consumption at low RPM. For other uses, see VTEC (disambiguation).
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