staz1000 said:It has variable inlet timing ie the size of the inlet is adjusted. It's actually called Continuous intake camshaft adjustment. Variable Valve means it uses 4 inlet valves until a certain point and then all 8. Dependant on how many valves there are of course. The TFSI does not do this.
EDIT: I'm reading the pdf file posted by a3norwich and although it mentions variable vale timing it doesn't seem to mention it again or explain it. If it was continously changing the number of vavles used then surely there'd be a kick like in any other VVT car. I'm still confused on this. Also as fsi injects direct;y into the chamber the inlet valves are only used to add air. And tumble flaps are used to adjust the fuel/air mixture inconjunction with the fuel pressure regulator. Normal VVT engines are completely different from this.
VVT is where the rotation of the inlet camshaft is retarded or advanced to vary the opening of the inlet valves in relation to the crankshaft angle.
VVT is not where the some of the valves are used and some not used, this is called cylinder deactivation!!!!! They use this on most gas guzzlers and also some city cars to increase fuel economy.