Engine Test Lab Report

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Spark Ignition (Petrol) Engine Test Abstract Since the use of spark ignition engine has augmented rapidly, there is therefore need to carry out an engine test in order to know the performance of the engine and how its efficiency can be improve. This experiment (engine test) was carried on a 4 cylinder petrol engine Volkswagen 999cm3, which has a compression ratio of 10.5:1 driving an eddy current brake. A cooling water heat exchanger was used instead of a radiator which is used in normal automobiles. The spark ignition engine is connected to a computer where it is monitored and controlled by a special Signal Conditioning Electronics and Programmable Logic Controller (PLC). The results obtained are recorded by MOTEC and CM11 software as a performance map and are represented in excel sheet. These results are obtained by setting the engine speed at 3000rpm and increasing the throttle positions. The data obtained are used to plot graphs such as the brake thermal efficiency against torque, brake specific fuel consumption against torque, air-fuel ratio against torque, Pb, Pe, Pcw and PF and (Pb+Pe+Pcw) against torque, exhaust temperature against torque and volumetric efficiency and torque against throttle position. The performance map is very important in determining the appropriate gear ratios of automobiles. Introduction Nowadays, virtually all automobiles make use of spark ignition (Petrol) engines. Therefore, this laboratory exercise (engine test) is very crucial as it can be used to improve the work output of small industrial units which make us of industrial engines running on petrol. Spark ignition engines are used widely in the manufacture of cars and in industries, Lichty (1967). Moreover, this laboratory experiment is important when trying to know the characteristics of an engine. This is because automobile engines functions over a wide range of

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