Internal combustion center injection type engine and method for injecting fuel in an internal combustion center injection type engine

Internal combustion center injection type engine and method for injecting fuel in an internal combustion center injection type engine, especially a multiple valve engine, with at least one combustion chamber (S), a piston (14) and an injector (18) which is provided for injecting fuel spray towards a central portion of an upper surface (14a) of said piston (14), said fuel spray impinges a restricted surface (14a3), which is formed in the central portion of the upper surface (14a) of the piston (14), and said fuel spray spreads substantially laterally with regard to a fuel injection direction.