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Re: new 325 is owner what is vanos? (archive)

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Posted by Howhi on September 22, 1998 at 10:46:43:

In Reply to: new 325 is owner what is vanos? posted by greg on September 22, 1998 at 09:26:35:

: I am looking at doing some performance up grades to my newly acquired 93 325is and the term vanos or non vanos comes up. What does that mean?

: Thanks Greg

: Thanks

In the US version of an ///M Roadster, there is a VANOS or "variable valve-timing system." Although I am no expert, I think this has reference to the timing of the valve opening with relation to the firing of the plugs?? Since the timing on the plug firing can probably vary under certain conditions and over time, VANOS is a way of making the engine more efficient at burning fuel, thus producing a more consistant HP rating, etc.

The European version of the ///M Roadster has a Double-VANOS engine, which I read about somewhere, but can not remember exactly what it is. I think it also includes variable camshaft timing or something else related to engine timing/firing.

Sorry if I have not provided a great answer(and am probably wrong about the details. Hopefully, someone will trash my answer by providing the correct info, and then we'll all know what the VANOS mystery is.

BTW, I am still wondering if VANOS is some sort of German acronym???

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