double vanos vs vtec

[artworkz]

vanos is just like VVTi, using street cam profile focus on fuel efficient. vanos is means the cam pulley can be variable timing. btw vanos and double vanos is old thing, newer version is valvetronic which can continue vary cam timing, lift n duration which is much more advance than iVtec

 

[mexamia]

if im not mistaken..BMW service just replace your VANOS with new one if your VANOS got problems..

 

[arif_tarabas]

owh yeah?

 

[GEFORCEXTREME]

I don't think they can be compared that way, but I'm more towards valve technologies that changes between different cam profiles like VTEC. It all depends on the engine that does cam profile switching, if the high cam is super aggressive, of course cam profile switching (VTEC) wins, VVTi is just to control the overlap of the intake and exhaust valve.

One is like to change the camshaft, one is to dial the camshaft with adjustable cam pulleys, which will make more power on the same car? My bet would be on cam profile switching (VTEC). Correct me if I'm wrong.

 

[quicksilver7]

VTEC is the same as having 2 sets of cams in your engine. a set of low cam for low to mid RPM and a set of high cam for high RPM. During high RPM, more air needs to be fed into the engine -> longer valve overlap -> needs higher cam duration.

So for the same engine displacement, a high cam would always be faster than a low cam. Vanos is just adjusting the timing of the valve overlap (i.e. moves it forward or backward but not longer or shorter)