{"references": ["T.D\"Andreaa, P.F.Henshawa, D.S.-K.Ting \"The addition of hydrogen to a gasoline-fuelled SI engine\" International Journal of Hydrogen Energy 29 (2004) 1541-1552.", "Bambang Sudarmanta1, Sudjud Darsopus-pito2, Djoko Sungkono \"Application of dry cell hho gas generator with pulse width modulation on sinjai spark ignition engine performance\"", "Changwei Ji, Shuofeng Wang \"Effect of hydrogen on combustion and emission performance of spark ignition gasoline engine at lean conditions\".", "Hameed Ullah Mughal, Naseem Abbas, Nasir Hayat, Syed Fiaz Hussain Shah and Muhammad Sajid Kamran \"Exhahust Gas Analysis Of 70-Cc Engine Running On Mixture Of Hho & Petrol\" ISSN 1013-5316; CODEN: SINTE 8.", "Pratik jain, Piyush Thakre, Prof.S.S.Deshmukh \"Emissions measurement of various blends of oxy hydrogen gas and gasoline in 4-S S.I. Engine\".", "Al-Rousan Ammar a \"reduction of fuel consumption in gasoline engine by introducing HHO gas into intake manifold\", international journal of hydrogen energy.", "E.Leelakrishnan, H. Suriyan \"performance and emission characteristics of brown gas enriched air in spark ignition engine\", international journal of innovative research.", "N N Patil, C B Chavan, A S More and P Baskar \"Generation of oxy-hydrogen gas and its effect on performance of spark ignition engine\".", "Shashikant Jhadav Darshan Gabhane and Deshmukh S.S. \"investigatting the effect of oxy- hydrogen (HHO)gas and gasoline blend addition on the performance of constant speed internal combustion engine\", international engineering re-search journal.", "Shiva Prasad KV, Raviteja S, Chit agar Pan Kumar GN\" Experimental investigation of the effect of hydrogen addition on combustion perfor-mance and emissions characteristics of a spark ignition high speed gasoline engine\"."]}

This research paper is about study related to HHO generator and its implementation on S.I. Engine. With increasing petrol prices & depletion of its sources, it’s harmful environmental effects. To deal with these researchers are working on alternative and supplementary fuels. HHO gas can be used as supplementary fuel with petrol to reduces consumption of petrol. This technology can be directly be used in present engine without any major changes in engine. It’s effects on engine performance, fuel consumption and environmental effects are investigated by researches.