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One of the most important parameters for engine performance is a fuel that is used, the quality of its fuel as well as the value of the octane number. Gasoline fuel that distributed in the markets in Indonesia has a lot of value of octane number. For example, there are Gasoline 88, Gasoline 92, and Gasoline 98. These three types of fuel have different octane numbers and different prices. Most people just consider the price in its use without regard to existing specifications. This paper investigates the effect of using Gasoline with different values of octane number on performance and exhaust pollutant emissions of a four strokes 150 cc single cylinder spark-ignition (SI) engine without any modifications, in AVL dyno engine test. Experiments were conducted at maximal load or wide open throttle (WOT) and different engine speeds ranging from 1000 to 2500 rpm. Engine power, torque, specific fuel consumption and exhaust pollutant emissions were measured during each experiment. [ABSTRACT FROM AUTHOR]

Bioethanol is a natural product and manufactured by the fermentation of plants containing sugar and starch. Characteristic physical and chemical of bioethanol near to gasoline. As a biofuel, bioethanol can be used as a fuel substitution for gasoline with hopefully can decreasing emission and renewable energy for security energy. The objective of this research was to determine the effect of bioethanol-gasoline blended fuels on the performance SI Engine compared with varying gasoline at the market. The experimental test was using gasoline with octane number 88, 92, 98, with 5%, 10%, 15%, and 20% bioethanol blends. The effect of the bioethanol-gasoline blend on performance SI engine 150 CC is increased research octane number, and to decrease heating value with increasing blending bioethanol can decreasing power and increasing fuel consumption. The one important things in this research had differences of each kind of gasoline toward performance and emission of SI engine. [ABSTRACT FROM AUTHOR]