What is true about stern drive and inboard engines?

The statement that inboard and stern drive engines are automotive engines adapted for marine use is accurate. This is because the fundamental design and operation of these engines are initially derived from automotive engineering principles. They are modified to withstand the unique conditions of a marine environment, which includes considerations for water exposure, cooling methods, and durability against corrosion.

These adaptations can involve changes to the engine's cooling system, exhaust systems, and other components to ensure they operate efficiently and safely in a boat. This is significant as it highlights the practical modifications made to engines, which allow automotive technology to be effectively utilized for boating purposes.

While certain adaptations make them suitable for marine use, they still fundamentally operate on the principles of internal combustion engines found in cars, distinguishing them from dedicated marine engines that are specifically designed from the ground up for watercraft applications. This choice provides a clear understanding of how marine propulsion engines relate to automotive technology.