<![CDATA[The growing number of motorised vehicles, bringing out two serious threats: the first economic factor in the form of oil fuel that is getting longer is thinning. To the two factors of environmental pollution, which is the pollution caused by the combustion of oil fuel either directly in the form of harmful exhaust emissions such as CO, and HC and indirect pollution in the form of global warming Potential Caused by the amount of CO2. Therefore, it takes an environmentally friendly alternative energy as fuel, one of which is LPG fuel (Liquefied Petroleum Gas).The purpose of this research is to determine the influence of the use of LPG fuel against the exhaust gas emissions of CO, and HC on 4-Step Motors. The results showed that the use of LPG fuel on 4 Stroke Motors was able to reduce emissions of exhaust gas CO and HC. The lowest CO-rate occurred at a 1500 rpm round of 0.49% vol, while the highest HC at 1500 rpm was 358% Vol. While the lowest CO2 at the 1200 rpm rotation was 2.94% Vol. Specific fuel consumption (SFC) tends to be more efficient than Using premium fuel, because the use of LPG fuel provides the optimization of combustion. This is due to the fuel-air mixture that goes into the cylinder of the combustion chamber into a homogeneous mixture and causes perfect burning.]]>
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