![]() ![]() ![]() One disadvantage of a direct-drive inboard engine is it is located at the center of the boat which means it can take up a lot of space. The benefits of a d-drive inboard motor are they provide maximum performance and are energy efficient. Most direct-drive inboard motor propellers rotate clockwise when viewed from the rear of the boat. The direction of the propeller will depend on the rotational direction of the engine and the orientation of the propeller blades. To operate a direct drive inboard motor, a boater will typically start the engine with a key in the ignition from the cockpit and engage the transmission to engage the propeller. This means that the engine is directly connected to the propeller shaft which allows for efficient power transfer and maximum performance. The d-drive inboard motors are designed to provide direct power to the propeller. This prop shaft angle means the boat is always ![]() Direct-Drive Inboard MotorĪ direct-drive inboard motor, also known as a "d-drive inboard motor", is a boat motor placed in the center of the boat's interior with a prop shaft at an 7 to 12-degree angle. The D-drive, V-drive and Jet Drive inboard motors are considered true inboard motors meaning the entire engine unit is inside the boat. There are 3 main types of inboard motors which are: This system is not preferable since it brings in dirt and other contaminants into the engine. The raw water cooling system runs raw water around the engine without having a heat exchanger. The closed cooling system, also called the "heat exchange system" has tubes that come into contact with the water so the water can “cool” the coolant running through the tubes. There are two main cooling systems for inboard engines:īoth of these use water as the cooling medium but it is the system that makes them different An inboard motor is a motor that is permanently placed inside the boat and it helps power a prop shaft/propeller through the hull. ![]()
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