what is the difference between vtec,i-vtec and i think there is another version of vtec if i remember correctly?
Quote:
Acura introduced variable valve timing in 1990 in its NSX sports car. The technology’s goal is to maximize output at high engine speeds and efficiency at low rpm. This is an issue because the valves that allow air to enter the engine’s cylinders — and those that let exhaust gases escape — don’t perform optimally at all engine speeds. (If you need help visualizing any of these parts, look below to the Four-Stroke Cycle section of our Interactive Car.) A conventional engine’s valves operate in a linear fashion, happily opening and closing twice as fast when engine speed doubles. The air and exhaust gases are not as cooperative, however. At higher rpm, air typically doesn’t flow through the valve ports fast enough for optimal performance. Variable valve timing addresses this by opening the intake valves earlier, wider and/or for a longer duration at high rpm. Honda/Acura’s original system was named VTEC, a forced acronym for Variable valve Timing and lift under Electronic Control. “Lift” refers to how far the valves open.
Until now, VTEC engines have been characterized by a noticeable power increase at a particular, fixed rpm — the engine speed at which the camshafts switch to the high-rev profiles and allow the engine to breathe better. The feel is not unlike that of a turbocharger kicking in, and basically for the same reason. Though other automakers have beaten Acura to market with the technology, the company used the RSX to introduce continuously variable valve timing, a system that varies valve timing and lift over the entire engine speed range. The result is even greater efficiency, lower emissions and seamless acceleration. The company calls the new generation i-VTEC, with the i representing “intelligent.”
he's 100% right. try a few and i think all questions will be answered. and if they're not then come here. that way at least you come in with some knowledge.
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