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From the 2000 brochure: (archive)

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Posted by JTP on October 24, 2000 at 13:26:21:

In Reply to: Q for Techies: What is a vanos? (more) posted by JWR on October 24, 2000 at 12:05:07:

"The VANOS system allows the engine to 'steplessly' choose valve timings. VANOS, in the M Roadster, operates the intake cam. The Z3 Roadsters benefit from Double VANOS, which operates both intake and exhaust cams.

Electronically controlled in response to engine speed, load and temperature, VANOS maximizes engine response, efficiency and emission control. The benefit: more low-end torque for strong acceleration and added flexibility for better highway performance, plus a quieter, smoother engine at idle."

Hope that helps!

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