in the fuel supply circuit preferably mounted to the injector body 30 by being threaded into the lateral fuel channel 42 this valve alternately connects the high pressure fuel supply line to the injector or to a fuel dump on appropriately timed commands fig3 shows a preferred source of pressurized air this device draws air from the piston compressed air in the cylinder of a non premixed charge engine itself through access hole 49 drilled through the cylinder wall 12 into head space 13 at a predetermined distance below tdc top dead center the air is fed to an air reservoir 51 through pressure tubing 52 having a check valve 53 which prevents the air to flow back into the cylinder in the reservoir the individual pressure pulses accumulate until the ambient pressure reaches a value which corresponds to the pressure of the piston compressed air in the cylinder at the time the piston closes the access hole because it is desirable to form a jet and plume whose temperature is below that of the piston compression heated air in the head space of the cylinder the air in reservoir 51 is cooled such as by means of coolant carrying coil or cooling fins 54 in order to impart the air with the necessary increase in pressure for proper jet formation pressure intensifier 55 is provided comprising housing 56 and compound piston 57 suitably outfitted with appropriate seals computer operated pintle valve 58 in pressure line 59 is used to meter out the desired quantity of air for jet formation into.