Engine comprising a cylinder head with at least one inlet duct

The engine comprises of a cylinder head which presents four cylinders (4), each including two gas inlet conduits (6, 8). An end of each conduit presents a dissymmetrical side (32) inclined with respect to a longitudinal axis (16) of the conduit in order to support a gas flow along a circumferential direction of the corresponding cylinder. Each conduit is associated to a valve (10) that follows movement laws. An independent claim is also included for a vehicle.