The biggest difference is the cooling system The biggest technical difference between a marine and an industrial diesel engine is the cooling system of the engines. A marine diesel engine is cooled indirectly by sea water. By using a heat exchanger, the seawater can cool down the high temp engine water.

Marine generators are distinctly different than residential or industrial generators because they are manufactured to resist corrosion and other moisture issues associate with being at sea. Additionally, marine generators are designed to be as compact as possible to allow for maximum free-space within the vessel.

The main difference between the petrol engine and diesel engine is that in a petrol engine, fuel and air both are compressed with a spark, while in a diesel engine, only air is compressed, and fuel is injected in compressed air. Petrol engines and diesel engines work on the otto cycle and diesel cycle, respectively.

Marine Engines: Marine engines may utilize common-rail fuel injection systems to enhance fuel efficiency and reduce emissions. These systems provide better control over fuel delivery. Industrial Engines: Industrial engines may use simpler fuel injection systems due to different emissions regulations and demands.