Important factors in changing ground engines to the naval ones

In aim of writing this article is to study the efficiency of changing ground engines to the naval one considering the environmental operation condition of ground engine and their ratio of smallness to the power of these engines. So, changing the main structure of ground engine for this purpose is not possible and needs a new design and structure. By changing the parameter of mid-effective pressure of engine power can achieve this purpose and increase the engine power. Considering the environmental operation condition of these engines, sea water can be used for cooling purposes.