What is the difference between an Inboard and Outboard boat engine?

What’s the difference between a boat with an inboard engine and one with an outboard engine? Which type is best suited for gasoline or diesel engines? These are common questions, and Océane’s experts have provided some insights.

The difference between inboard and outboard engines

Let’s start with the basics: Unlike outboard engines, which are mounted externally, typically at the back of the boat, inboard engines are installed inside the hull, either in an engine compartment or a dedicated engine room in larger vessels.

An inboard engine is mounted inside the hull, usually towards the center or rear of the boat, and is connected to the propeller via a drive shaft. This setup allows it to propel the boat from within.

On the other hand, an outboard engine is mounted externally at the rear of the boat. It combines both the engine and the propeller and is attached to the boat via a pivoting arm, known as the transom.

Gasoline or diesel?

Both gasoline and diesel engines can be used for inboard and outboard configurations. However, outboard engines are more commonly paired with gasoline engines, while inboard engines can operate with either gasoline or diesel.

Which engine should you choose for your next boat?

Outboard engines are typically better suited for smaller to medium-sized boats, offering easier installation, simpler maintenance, enhanced maneuverability, and the ability to partially raise the engine out of the water. They’re often used for pleasure boats, inflatable boats, and fishing vessels.

In contrast, inboard engines are more commonly found on larger boats such as sailboats, yachts, and cruisers. They offer better weight distribution, improved fuel efficiency at cruising speeds, and greater flexibility in hull design.

The choice between an inboard and outboard engine depends on the type of boat, intended use, boat size, personal preferences, and budget. Both setups have their pros and cons, so it’s essential to consider all these factors before making a decision.