Editing VANOS (section)

==Operation==
VANOS is a [[variator (variable valve timing)|variator]] system that varies the timing of the [[poppet valve|valves]] by moving the position and the [[camshaft]]s in relation to the drive gear. The relative timing between inlet and exhaust valves is changed.

At lower engine speeds, the position of the camshaft is moved so the valves are opened later, as this improves idling quality and smooth power development.
As the engine speed increases, the valves are opened earlier: this enhances torque, reduces fuel consumption and lowers emissions.
At high engine speeds, the valves are opened later again, because this allows full power delivery.<ref name=bmw>{{cite web|last=BMW Technology Guide | title=VANOS/Double-VANOS | url=http://www.bmw.com/com/en/insights/technology/technology_guide/articles/vanos_double_vanos.html | publisher=BMW | archive-url=https://web.archive.org/web/20170203050147/http://www.bmw.com/com/en/insights/technology/technology_guide/articles/vanos_double_vanos.html | archive-date=2017-02-03 | access-date=2017-10-12}}</ref>