Additional acceleration system for an internal combustion engine

Additional acceleration system (S) for an internal combustion engine (1), comprising means (3,4,5) for an additional compressed air intake to the cylinders (C) of said engine (1), the mentioned intake system comprising means (4,5) for withdrawing said compressed air from means (6) for containing compressed air coupled and being integral part of the cylinder head T, and intake means (3) suitable for introducing said compressed air directly in said cylinder (C) before the fuel injection.