Abstract: The designed engine cover in this paper is made of different plastic materials, today’s ever increasing demand for newer, lighter materials with higher strength, greater stiffness, and better reliability has led to wide research on development of thermo plastic materials. These materials offer a combination of strength and modulus that are either comparable to or better than many traditional materials such as metals. However, with the development need for materials with superior properties from the private sector, composites are now making their way into more common applications. However study on the static and dynamic mechanical behaviour, long term durability, and environmental stability of these materials are limited. Under-the-bonnet applications came later with the more widespread availability of high-performance thermoplastics (referred to as ‘engineering plastics’) and contributed significantly to cost and weight reduction in the engine compartment.