Additionally the V8s are fitted with continuously variable length inlet runners adjusted according to the revs in order to profit from the harmonic vibrations of the airstreams generated by cyclic closings and openings of the valves. The charging is thus optimal on the whole rev range, especially since no throttle plate causes turbulence.
A poly-V belt ensures the drive of all the accessories.
The performances of these new engines are clearly improved. The 4.4 liters V8 power is increased from 286 to 333 hp (ECE) whereas their consumption is reduced by 10 to 14 %. See also our file about the new V12 on which the Valvetronic is used together with direct injection, and the one about variable length intake runners.