electronic control means are moreover pre arranged for obtaining a plurality of different adjustments of the intake valves each intake valve may undergo three adjustments retarded opening anticipated closing and retarded opening plus anticipated closing if two intake valves are provided for each cylinder the aforesaid three possible basic adjustments can be combined together in various flexible ways giving rise to ten different modes of valve management which are chosen according to the desired adjustments in terms of pumping turbulence inside the combustion chamber and motions inside the combustion chamber obviously in the case of cylinders with three or more intake valves the possible combinations increase in what follows the ten different modes of adjustment of the two intake valves associated to each cylinder are specifically described 1 anticipated closing of both intake valves closing of both intake valves is anticipated and with equal lift see fig2 this mode enables low values of pumping and of turbulence in the combustion chamber to be achieved and consequently a reduction in consumption and in no x at exhaust 2 anticipated closing of both intake valves with different valve lift see fig3 this mode enables a motion of inclined swirl to be created in the combustion chamber and to manage it with the valve that has the lower lift at the same time however keeping the pumping values low 3 alternate anticipated closing of the intake valves see fig4 both of the intake valves undergo anticipated closing but only one of them opens alternately for each engine cycle this mode enables a slight increase in turbulence in the combustion chamber generating a motion of inclined.