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VANOS
Verified 2026-05-19
VANOS is BMW's marketing name for the variable camshaft timing system that hydraulically rotates one or both camshafts relative to crankshaft position, introduced on the M50TU in September 1992 (single-VANOS, intake) and extended to double-VANOS (intake + exhaust) on the S50B32 in 1996 and the M52TU and S62 in 1998.
VANOS belongs to the Variable valve-timing systems, BMW segment.
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VANOS: Core Facts
- Abbreviation
- VANOS
- Category
- variable-cam-timing
- Manufacturer
- BMW AG
- Related terms
- valvetronic
- Segment
- Variable valve-timing systems, BMW
VANOS: Frequently Asked Questions
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What does VANOS do?
VANOS hydraulically rotates the camshaft relative to the crankshaft via an oil-pressure-controlled actuator on the cam sprocket, advancing or retarding valve timing to optimise torque at low rpm and power at high rpm.
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Which BMW engines use VANOS?
Single-VANOS (intake only) appears on the M50TU (1992), M52 (1994–1998), S50, S52, and M62. Double-VANOS (intake + exhaust) debuted on the S50B32 (1996) and subsequently appeared on the M52TU (1998), M54, S54, S62, N52, N53, N54, N55, S65, and all subsequent B-series petrol engines.
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What is the difference between single-VANOS and double-VANOS?
Single-VANOS varies timing on the intake camshaft only. Double-VANOS adds independent control of the exhaust camshaft, enabling broader torque-curve shaping and improved part-load fuel economy.
VANOS: Distinction
VANOS is not Valvetronic (BMW's variable valve-lift system on the intake side, introduced 2001 on the N42) and not VVT-i (Toyota's equivalent variable-timing technology, mechanically and electronically distinct).