Originally Posted by
Rossco
Iam I right saying that that BMW`s VANOS system does not infact advance the cams at revs but reteards the cams at lower revs? Iam sure thats what I read when IO rebuilt mine many years ago.
It will depend on many factors... but most VANOSs are infinatly variable ie constantly changing.
Generally speaking you right - low revs needs lower valve over lap so the inlet and exh are moved apart.
Higer revs need more overlap.