Relative Change in SI Engine’s Emission and Performance Parameters Using New Locally Made Octane Enhancer

Abstract

In this study, a new gasoline Octane enhancer was made in Al-Doura refinery in Baghdad andwas used with the Iraqi pool gasoline. The main objective of this study was to find an Octanebooster to the low Octane Gasoline produced by Al-Doura refinery that does adversely affect itschemical, physical or combustion properties. This additive was then added to gasoline indifferent percentages (2.5% till 15% Vol) and the blend’s properties e.g. calorific value, density,Octane number (RON and MON), gum content, sulfur content were measured. These blendswere then tested against the performance of the original pool gasoline using previously calibratedand tested software. The relative change in the engine performance was then observed andcompared. It was found that the octane number of gasoline significantly improved after additionof the additive, its gum content decreased, its calorific value decreased while the sulfur contentwas slightly increased. No major change in the engine performance was noticed except for thedecrease in peak cylinder temperature and the sulfur dioxide and nitrogen oxides level at 2.5%then increased with additives.