FIELD: mechanical engineering; internal combustion engines. SUBSTANCE: air or fuel-air mixture is taken in into above-piston space of one of interconnected cylinders shifted through 540o during the first stroke, compression and ignition are provided during the second stroke, and combustion of fuel-air mixture for conversion of energy of expanded combustion products into shaft rotation, during the third stroke. Displacement of combustion products from above-piston space of first cylinder into above-piston space of other cylinder by complete bypassing of combustion products takes place during the fourth stroke. Compression of combustion products and delivery of neutralizing liquid into above-piston space for neutralizing combustion products and converting remaining energy of combustion products into shaft rotation takes place during the second stroke in second cylinder. Neutralizing liquid is vaporized during the third stroke. Neutralized exhaust gases with vapor particles are forced out into atmosphere during the fourth stroke. In four-stroke internal combustion engine implementing this method, one of cylinders connected by channel, designed for using the energy and neutralizing combustion products, is furnished with nozzle to supply neutralizing liquid. Other cylinder is designed for fuel-air mixture. EFFECT: increased engine effective efficiency, reduced noise and toxicity of exhaust gases.
