This page is a compilation of information I have found regarding the operations of single variable vanos using two solenoids as used by BMW in the S50B30 engine as well as the most comprehensive single file I have found regarding Vanos found online.
Here is a very comprehensive pdf file I found on some
chinese document website. It contains information on all of the vanos systems bmw offers.
http://rapidshare.com/files/454023393/bmw_mfp-pi_vanos_en.pdf
Some pics in german of the operations of the vanos system and the amount of travel on the inlet cam.
I don´t understand german so somebody else will have to make sense of these images and the information.
