International Science and Technology Journal

Internal combustion engines known as one of the means necessary and vital in the performance of cars and trucks work ...... etc. As well as to carry out institutions requirements which have many different activities, also benefit in generating the electric power and water extraction by transferring fuel thermal energy into mechanical energy. The most common used engines are that have the reciprocating movement of the piston. For efficiency and high quality all kinds of internal combustion engines were developed through development of the industrial tools, precise measuring devices, and metals technology.
The connecting arm converts the resulting reciprocating movement of the piston movement to a rotational movement at the crankshaft. The main force of connecting arm is the result of exhaust gases on the piston pressure, as well as the inertia of the piston and its accessories. This force vary depending on the parallel resulting in of in connecting arm according to pivotal arm as well as the pressure of exhaust gas causes compression stress causes, which has its maximum at the upper dead point.
This study provides a model for connecting arm for engine sports car SEA. The connecting arm which has the shape of letter ' H' and made from alloyed steel which is thermally treated exposed to pressure, buckling and tensile as a result of converting linear motion of the piston to the circular motion of the shaft attached by connecting arm. The stresses and strength reaches its maximum at the angels of (90°) and (270°) of the crankshaft. The aim of this study is to test the performance of the model and to analyses stresses and strength at different angles of the crankshaft.