Compression ignition direct injection internal combustion engine

A compression ignition, direct injection internal combustion engine, particularly comprising at least one cylinder, a piston and an injection nozzle, a combustion chamber or cavity in the form of a body of rotation disposed in the piston and receiving almost the entire quantity of combustion air at the end of the compression stroke, wherein said chamber having, below the crown of the piston, a constriction dividing the chamber into an upper and a lower part, said injection nozzle being mounted with the nozzle tip at least near the axis of the chamber and with the fuel jets being directed towards the wall of the chamber, the geometrical points of intersection of the axes of the nozzle holes lying below the narrowest cross-section of the constriction in the chamber throughout the entire injection period, a connecting passage formed by the constriction between the upper part and the lower part of the combustion chamber including a number of connecting canals in the region of the circumference of the chamber, and said connecting canals being constructed to be groove-like and open to the chamber.