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variable valve lift
Variable valve lift is a technology which is increasingly used in automotive piston engines. It varies the height that a valve opens, in order to improve performance, fuel economy or emissions.
When used in conjunction with variable valve timing, variable valve lift can potentially offer infinite control over the intake and exhaust valve timing.
==History==
In September 1975, General Motors (GM) patented a system intended to vary valve lift. GM was interested in throttling the intake valves in order to reduce emissions. This was done by minimizing the amount of lift at low load to keep the intake velocity higher, thereby atomizing the intake charge. GM encountered problems running at very low lift, and abandoned the project.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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