Abstract

The effect of changing in air intake temperature plays an important role to the performance of spark ignition engine. Therefore, increasing or decreasing of surrounding temperature in the world nowadays will affect the performance and the quality of air especially related to spark ignition engine. Thus, this study will be conducted to determine the heated value of air intake temperature that influence engine performance and emission. Spark ignition engine also known as heat engine depends so much to the changes in temperature. This study will present the experimental result on the performance of spark ignition engine at various cooled air intake temperatures on four-stroke four-cylinder spark ignition engine. This study also investigated the level of emission released to the environment due to decrease in air intake temperature. In this study, the exhaust emissions percentage values of CO2 and HC are recorded by using Chassis Dynamometer (MD-2WD-500). The data was taken under three different gears (gear 2, 3 and 4) at varying speed (1000, 1500, 2000, 2500 and 3000 rpm) and intake temperature range (15℃~25℃). Based on the data and result recorded, decrease in temperature do increase the engine performance and also decrease the emission percentage as well.

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