Full details now available on the BMW AG Valvetronic engine add significantly to WEVTU's advance pre-release report (see WEVTU — Jan. 1, '01, p.1). The unique feature of the Valvetronic 4-cyl. unit is the scrapping of the conventional throttle butterfly — instead using the inlet valves as the “throttle” by instantaneously varying their lift on the induction stroke. This eliminates the typical throttled-engine pumping losses that waste up to 10% of engine power, BMW states, and thus gives a ...
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