crown which are also offset against each other by 180 u00b0 and which are located opposite the nozzles 101 before or during ignition the spoons may also be arranged on the nozzle carrier 6 opposite the nozzles 101 in order to achieve symmetrical flame propagation also if the clouds of ignitable mixture are formed outside the recess in the piston two pairs of electrodes offset against each other by 180 u00b0 are provided on the circumference of the nozzle carrier in the region of the nozzles 10 or 101 the circumference of the recess 31 in the piston is shaped so as to prevent the piston from coming into contact with the electrodes and to provide room for the clouds of ignitable mixture if the recess 31 in the piston is spherical it may be advantageous to keep the gap between the nozzle carrier and the case of the recess in the piston crown very narrow and to provide two appropriately shaped enlargements at the edge of the recess and to dispose these enlargements opposite each other a compact hot ignition jet is discharged from each of the said two recesses after ignition the nozzles 101 and the electrodes 11 are then disposed in the region of the end face of the nozzle carrier the recess in the spoon 35 may be replaced by a channel which runs out helically from the spoon 35 into the recess 31 of the piston in order to direct the fuel discharged from the downwardly slanting nozzles 101 or.