Brown s gas (HHO) has recently been introduced to the auto industry as a new source of energy The present work proposes the design of a new device attached to the engine to integrate an HHO production system with the gasoline engine The proposed HHO generating device is compact and can be installed in the engine compartment This auxiliary device was designed constructed integrated and tested on a gasoline engine Test experiments were conducted on a 197cc (Honda G 200) single cylinder engine The outcome shows that the optimal surface area of an electrolyte needed to generate sufficient amount of HHO is twenty times that of the piston surface area Also the volume of water needed in the cell is about one and half times that of the engine capacity Eventually the goals of the integration are a 20-30% reduction in fuel consumption lower exhaust temperature and consequently a reduction in pollution (C) 2010 Professor T Nept Veziroglu Published by Elsevier Ltd All rights reserved