FIELD: mechanical engineering; internal combustion engines. SUBSTANCE: proposed precombustion chamber has space accommodating spark plug and communicating with main combustion chamber through bypass channel made in form of profiled de Laval nozzle whose inlet section has generatrix of outline defined by Vitoshinsky relation, and inlet section is made in form of paraboloid. EFFECT: reduced fuel consumption and toxicity of exhaust gases. 2 cl, 1 dwg
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