BMW AG already is looking beyond its innovative Valvetronic concept, where the inlet valve is used as the engine throttle, thus eliminating the usual throttle butterfly and the associated energy-sapping pumping losses (see WEVTU — Jan. 1, '01; March 1, '01). As a future alternative, the German company, like other automakers, is developing a system of electromechanical valve actuation (EVA) using a solenoid actuator for each valve instead of the usual mechanical camshafts and valvetrains. ...
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