Abstract: The method disclosed increases the energy conversion efficiency of a spark ignition internal combustion engine by substantial reduction of friction between the cylinder walls and associated piston rings. The result is achieved by eliminating the unwanted carbonaceous deposits on cylinder walls and associated piston rings by vapor nitric acid (HNO3). Nitric acid is produced through chemical reaction between oxygen (O2) and water vapor (H2O) in air and nitric dioxide (NO2), generated inside combustion chambers during intake and compression strokes by electric discharge on spark plugs. Specially designed or modified ignition system is used as a source of high-voltage for feeding the discharge.

Abstract: The improvement allows for simplifying the utilization of the method for increasing the energy conversion efficiency of internal combustion engine described in the U.S. Pat. Nos. 8,720,419; 8,776,765; 9,062,600 for spark ignition engines by means of generating nitrogen dioxide inside combustion chambers during intake and compression strokes, using spark plugs as discharge electrodes and specially designed or modified ignition system as a source of high-voltage for feeding the electric discharges, which generate nitrogen dioxide.

Abstract: The technique disclosed increases the energy conversion efficiency by means of substantial reduction of friction between the cylinder walls and the associated piston rings. The result is achieved by eliminating the unwanted carbonaceous deposits on cylinder walls and associated piston rings by means of vapor nitric acid (HNO3) delivered to the combustion chambers of an engine. Nitric acid is produced by means of chemical reaction between oxygen (O2) and water vapor (H2O) in air and nitric dioxide (NO2) generated throughout an electrical discharge in the air intake path.

Abstract: The technique disclosed increases the energy conversion efficiency by means of substantial reduction of friction between the cylinder walls and the associated piston rings. The result is achieved by eliminating the unwanted carbonaceous deposits on cylinder walls and associated piston rings by means of vapor nitric acid (HNO3) delivered to the combustion chambers of an engine. Nitric acid is produced by means of chemical reaction between oxygen (O2) and water vapor (H2O) in air and nitric dioxide (NO2) generated throughout an electrical discharge in the air intake path.

Abstract: The technique disclosed increases the energy conversion efficiency by means of substantial reduction of friction between the cylinder walls and the associated piston rings. The result is achieved by eliminating the unwanted carbonaceous deposits on cylinder walls and associated piston rings by means of vapor nitric acid (HNO3) delivered to the combustion chambers of an engine. Nitric acid is produced by means of chemical reaction between oxygen (O2) and water vapor (H2O) in air and nitric dioxide (NO2) generated throughout an electrical discharge in the air intake path.

Abstract: The technique disclosed increases the energy conversion efficiency by means of substantial reduction of friction between the cylinder walls and the associated piston rings. The result is achieved by eliminating the unwanted carbonaceous deposits on cylinder walls and associated piston rings by means of vapor nitric acid (HNO3) delivered to the combustion chambers of an engine. Nitric acid is produced by means of chemical reaction between oxygen (O2) and water vapor (H2O) in air and nitric dioxide (NO2) generated throughout an electrical discharge in the air intake path.

Abstract: The technique disclosed increases the energy conversion efficiency by means of substantial reduction of friction between the cylinder walls and the associated piston rings. The result is achieved by eliminating the unwanted carbonaceous deposits on cylinder walls and associated piston rings by means of vapor nitric acid (HNO3) delivered to the combustion chambers of an engine. Nitric acid is produced by means of chemical reaction between oxygen (O2) and water vapor (H2O) in air and nitric dioxide (NO2) generated throughout an electrical discharge in the air intake path.

Abstract: The technique disclosed increases the energy conversion efficiency by means of substantial reduction of friction between the cylinder walls and the associated piston rings. The result is achieved by eliminating the unwanted carbonaceous deposits on cylinder walls and associated piston rings by means of vapor nitric acid (HNO3) delivered to the combustion chambers of an engine. Nitric acid is produced by means of chemical reaction between oxygen (O2) and water vapor (H2O) in air and nitric dioxide (NO2) generated throughout an electrical discharge in the air intake path.

Abstract: The technique disclosed increases the energy conversion efficiency by means of substantial reduction of friction between the cylinder walls and the associated piston rings. The result is achieved by eliminating the unwanted carbonaceous deposits on cylinder walls and associated piston rings by means of vapor nitric acid (HNO3) delivered to the combustion chambers of an engine. Nitric acid is produced by means of chemical reaction between oxygen (O2) and water vapor (H2O) in air and nitric dioxide (NO2) generated throughout an electrical discharge in the air intake path.