<P> VANOS is a variable valve timing system used by BMW on various automotive petrol engines since 1992 . The name is an abbreviation of the German words for variable camshaft timing: variable nockenwellensteuerung . </P> <P> The initial version (retrospectively renamed "single VANOS") was solely used on the intake camshaft, while the later "double VANOS" systems are used on intake and exhaust camshafts . Since 2001, VANOS is often used in conjunction with the valvetronic variable valve lift system . </P>

What is a vanos unit on a bmw