Which type of engine is adapted from a four-stroke automotive engine for marine use?

The inboard engine is adapted from a four-stroke automotive engine for marine use because it utilizes similar technology and design principles that have been modified to withstand the unique conditions of being on the water. Inboard engines are installed within the hull of the boat and are typically connected to a propeller shaft that drives the boat.

These engines take advantage of the durability and efficiency of the four-stroke cycle, which includes the intake, compression, power, and exhaust strokes. This makes them a reliable choice for boating, as they provide good fuel efficiency and lower emissions compared to older two-stroke designs.

In summary, the inboard engine is specifically designed to meet marine requirements while utilizing the proven four-stroke technology found in automobiles, making it a suitable choice for boat propulsion in various water conditions.