The performance of a spark ignition engine is investigated under different values of ignition advance. A two-zone burnt/unburned\r\nmodel with the fuel burning rate described by aWiebe function is used formodeling in-cylinder combustion, and then experiments\r\nare carried out to validate the calculated data. By varying the ignition timing, the results of some characteristics such as power,\r\ntorque, thermal efficiency, pressure, and heat release are obtained and compared. The results show that optimal power and torque\r\nare achieved at 31?CA before top dead center, and performance is decreased if this ignition timing is changed. It is also shown that\r\nthe maximum thermal efficiency is accomplished when peak pressure occurs between 5 and 15?CA after top dead center.
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