Abstract: Oval, rounded or circular electrolytic cell designed for use in internal combustion engines that produces hydrogen/oxygen gases from water through an electrolysis process made up of at least seven oval metal plates and closed within two closing seal blocks, upper closing block (4) and lower closing block (6), made of non-conductive material such as plastic and rubber-type materials; where the five central plates are neutral electrolytic plates (1) and the plates at the two ends are the anode electrolytic plate (2) and the cathode electrolytic plate (3) and they are connected to current by means of two electrode cables (8) protected by a cable insulator (9) and at the closures they have lower electrolyte inlet slots (7) and other upper gas outlet slots (5), which, given the oval design of the cell, allow the gases generated during the electrolysis process to easily escape through the top openings and the electrolyte to easily and continuously replenish in each cell through the lower openings.