Outboard vs inboard4/5/2023 ![]() There are different types of outboard cycle types which are geared towards different things like speed and wake size, etc. This spinning motion turns the propeller which makes the boat move forward. This is just like the piston in a car-engine cylinder and often works through the same four-step process.” Chris Woodford ![]() “Powered by the burning and expanding fuel gases, a piston moves back and forth in the cylinder. At the bottom of the driveshaft is a gear which changes the vertical spinning motion into horizontal spinning. The piston rod turns the crankshaft, which turns the driveshaft (a piece that runs down the spine of the motor). This motor contains 627- horsepower and was first shown on the Miami International Boat Show in 2015. Because of the fuel, the piston is activated and moves back and forth according to the type of outboard motor.įun Fact: The largest outboard boat motor seen has been a Seven Marine motor. There is a fuel tank which sends fuel to burn in the cylinder to make power. They also typically have more horsepower because they can be larger and are more evenly distributed in weight than outboard motors. The inboard motor has less of a noise issue because it is tucked inside the boat rather than loudly working on the outside. This water cools the engine and is then pushed out of the system with the exhaust from the engine.Īll of this gives an inboard motor a lower center of gravity, which can help in rough seas. The water is pumped into the inboard from the outside by means of a hose, a hole in the stern, or another method, depending on the exact type of inboard boat you have. The faster the drive shaft goes, the faster the propeller goes as well, so the faster an engine explodes or combusts, the faster a propeller will move.Īn inboard motor cools by using the water around it. “An inboard engine works just like a car engine in terms of how it creates power and delivers drive to the boat.” Steve Smith When the drive shaft starts to spin, the propeller will also start to spin. Propellers are typically placed under the hull of the boat and are connected to the shaft. Multiple pistons that are pushed down at intervals create the spinning motion in the drive shaft. There is a piston connected to a drive shaft, or crankshaft, and gets pushed down from the combustion. This mixture ignites with a spark and creates an explosion of sorts, or what is called combustion. If it’s a gas or petrol inboard, it has combustible engines with cylinders that will fill with fuel and air. They actually work in a similar way to car engines. Inboard motors sit inside a compartment for the engine under the deck, so they don’t stick out like outboard motors. Each one is made to function for certain boats and those boats are all used for different types of activities. Just as each motor is placed in different positions on the boat, they are also different in their function. There are pros and cons to each and the pricing is vastly different. They both function differently with the different purposes they are meant for. The also function very differently causing major differences in cost and maintenance. Outboard motors go on the inside of the boat, usually at the back (stern). Inboard motors go inside the boat, usually low in the hull. Inboard and outboard boat motors differ in the placement of the motor. I took an interest and decided to share what I’ve learned. For example, take a look at this special edition for the 2012 Olympics.Īre you curious about what a boat with an outboard motor or an electric drive has to offer you? Click on the corresponding bold orange words.I never knew there was a difference between outboard and inboard motors until I began to familiarize myself with boats. In this way, water pollution through exhaust gases is minimal. The exhaust gases are discharged above water. ![]() Wet exhausts are usually used there to cool the exhaust gases. Inboard engines are usually four-stroke engines. Unlike an outboard motor where an engine is mounted outside the hull of the vessel, an inboard motor is a motor enclosed in the hull of the boat, usually connected to a propulsion propeller through a drive shaft.
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