Ic Engine Essay

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OBJECTIVE: The aim of this technical report is: 1 - Introducing different types of internal combustion engines, based on different categorization. 2 - Familiarization with the mechanism of operation of each, and the thermodynamic relations behind its theoretical cycles. GENERAL ASPECTS ABOUT ENGINES MECHANISM: Encarta 97 Figure 1 An Early Internal Combustion Engine The above image is an early design for internal combustion four-stroke four-cylinder engine. The main idea for any engine is the existence of a combustion chamber, in which fuel-air mixture exists. Then, this mixture is allowed to burn; either using a spark or by increasing its temperature and pressure of the mixture. Due to combustion, energy is liberated and the piston is forced to move. Accordingly, it transforms the produced power to the gearbox using the crankshaft. It should also be noted that air is allowed to enter and mix with the fuel using the camshaft mechanism. As previously mentioned, the main difference between the engines are either the number of strokes or the cycle that is used to ignite the fuel. STROKE CATEGORIZATION The stroke is defined as the length of the path that the piston goes through inside the cylinder. The upper end of the cylinder is referred to as the Top Dead Center (TDC), and the lower end is referred to as the Bottom Dead Center (BDC). Using the crankshaft mechanism, the linear motion that comes out from the piston due to the combustion is converted into rotational motion. Rotational motion is the required one to derive the wheels. Following is the explanation of the two-stroke and four-stroke engines. TWO-STROKE ENGINES: Two stroke engines are normally found in low power vehicles, such as: garden equipment, jet skis, and some motorcycles engines. From its name, the two-strokes engine refers to a type of an engine in which the

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