The objective of this work was to construct a simple innovative HHO gas generation system and evaluate the effect of combustion with HHO addition, as an engine performance improver, into gasoline fuel on engine performance and emissions. HHO cell was designed, fabricated and optimized for maximum HHO gas productivity per input power. This project consists of a small electrolysis fuel cell, Non return valves, 12V Battery, Two stroke SI engine and carbon filter. The electrolysis fuel cell is used

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... to generate HHO gas (electrolysis process) by using 12 volt battery. The carbon filter is used to absorb the water and dirt particles from HHO gas. And then these gases pass to the engine after the carburetor and control the gasoline charge. The results showed that the HHO gas maximum productivity of the cell was 18 L/h when using 2neutrals plates with 1 mm distance and 6 g/L of KOH. The results also showed 10% increment in the gasoline engine thermal efficiency, 34% reduction in fuel consumption, 18% reduction in CO, 14% reduction in HC and 15% reduction in NOx.