Pengaruh Pembebanan Terhadap Emisi Gas Buang Sepeda Motor 4 Langkah Dengan Sistem Dua Bahan Bakar (Bifuel) Premium dan LPG Dengan Variasi Sudut Penyalaan

Abstract

Development of vehicles in Indonesia nowdays is very fast specially the motorcycle. Exhaust gas of vehicles is the essential source of air pollution in our country. It is estimated that about 80% CO, 60% HC and 40% NOx in the atmosphere are emitted by the automobiles. Improvement of air quality thus requires a particularly attention to pollution emission of these kind of vehicles. Our researches focus on the application of alternative fuel, LPG (liquified petroleum gas). LPG offers some benefits compare with gasoline, its clean emission and higher octane number. A bi-fuel system (LPG/Gasoline) has been studied and manufactured for adapting on original gasoline motorcycle. In application, the LPG in gaseous state at 28 mbar is used, the mixture fraction at any regime of engines is controlled by a throttling valve (converter kit) wich is fitted on the carburetor. This experiment to find out the comparison of exhaust emission between gasoline and LPG using Stargas MOD 898 gas analyzer. One way to improve gasoline engine performance that used LPG gas fuel by controlling ignition timming more accurate. Controlling ignition timming is done by sliding angle position on pulser to get ignition timming accurately. The motorcycle running on LPG timing 110 have emission reduction of CO about 0,24% - 97,68% and HC up to 97,5% in comparison with original gasoline timing 140 running.