THE EFFECT OF FUEL OCTANE VALUE ON EMISSION LEVELS IN MANUAL (FOUR-STROKES) MOTORCYCLES

Abstract

This study aims to determine the effect of the octane value of the fuel on the emission level of a four- stroke motorcycle. The type of this research is Experimental Design with Factorial Experiment Research design with Two Factor Experiments in Completely Randomized Design. The four-stroke motorcycle used is a single- cylinder four-stroke motorcycle with a compression ratio of 9:1. Data analysis used descriptive statistical analysis with inferential statistics and sub-multivariate analysis of variance. The test was carried out with variations in engine speed of 1600 rpm, 3000 rpm, and 4500 rpm. Based on the results of the study, it was found that the exhaust emissions produced on four-stroke motorcycles using RON 88 fuel had the highest number of CO exhaust emissions at 1600 rpm and 4500 rpm, and HC at 1600 rpm, 3000 rpm, and 4500 rpm compared to RON 90 and RON 92. While the exhaust gas emissions of O2 RON 88 are lower at 1600 rpm and 3000 rpm compared to RON 90 and RON 92. The exhaust gas emissions of RON 90 are lower than RON 88 with the amount of CO and HC exhaust emissions. The exhaust gas emissions of O2 RON 90 are higher than RON 88. And the exhaust emissions produced by RON 92 in CO, HC, and CO2 exhaust gases are lower than on RON 88 and RON 90. The exhaust gas emissions of O2 on RON 92 are higher than on RON 88 and RON 90 but the exhaust emissions of O2 are not harmful. Hypothesis testing shows that there is a significant effect between the RON of fuel and CO and HC exhaust emissions. So, it can be concluded that fuels that have a high-octane rating tend to have a low amount of harmful exhaust emissions, namely CO and HC.