Abstract: NOx emissions from diesel engines are reduced by mixing water in the diesel fuel to reduce combustion temperatures. The water is proportionately mixed into the diesel fuel and the mixture is injected into the cylinders. When the engine is not operating, the water separates from the diesel fuel and causes rusting. In accordance with this invention, the mixing of water into the diesel fuel is terminated before the engine is shut off so diesel fuel purges the system of the water/diesel fuel dispersion so that there no longer is water in the diesel fuel supply system by the time the engine is stopped.

Abstract: NOx emissions from gasoline engines are reduced by mixing water in the gasoline to reduce combustion temperatures. The water is dispersed in the gasoline as the gasoline is delivered to the cylinders. When the engine is not operating, the water separates from the gasoline and causes rusting. In accordance with this invention, the mixing of water into the gasoline is terminated before the engine is shut off so as to purge the system of the water/gasoline dispersion so that there no longer is water in the fuel supply system by the time the engine is stopped.

Abstract: An internal combustion engine having pistons, cylinders, an air cooler, an air manifold and a turbocharger with a compressor. There is a tank to contain hot water under pressure. The pressure in the tank and the water temperature can be controlled. At least one injector allows heated water to be injected into the turbocharger compressor. A further injector allows water to be injected into the air cooler and a plurality of yet further injectors allow water to be injected into the air manifold. Conduits supply water from the tank to the injectors. Control of flow in the conduits is by valves. The invention permits the cleaning of an internal combustion engine without dismantling the engine or the turbocharger.