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How to choose an outboard motor
So, you have chosen a boat and are going to put an outboard engine on it. In the abundance of models of such motors, it is easy for a non-specialist to get confused. Models that look similar at first glance can actually be very different from each other.
To select the appropriate option, it is not enough for the buyer to focus on the amount of horsepower and engine dimensions. You will have to figure out the displacement, the number of cylinders, the differences between two-stroke engines from four-stroke ones, carburetor engines from injection engines, and direct fuel injection systems from electronic ones.
We tell you what all these parameters mean for the engine and how not to break your head, reading the data sheet of the outboard motor.
What power should the outboard motor have?
Power of modern outboard engines varies from 2 to 450 hp. (Mercury Racing 450R). There is, however, the Seven Marine 627SV, whose power is 627 hp, but in the fall of 2020, the Volvo Group, which includes the brand, announced that it was going to stop their production.
Engine power depends on two main parameters: the number of cylinders and displacement. Displacement is also called the "working volume" of the engine. This is the sum of the working volumes of all cylinders, which are calculated based on their cross section and the length of the piston stroke. Displacement indicates how much fuel an engine can burn in one cycle.
Carbureted or fuel injected outboard motor?
Fuel supply systems in engines are divided into carburetor and injection.
In a carburetor engine, liquid fuel is first mixed with air in a separate chamber to a homogeneous mixture (this process is called “carburetion”) and only then is it sucked into the cylinders.
The design of the carburetor is relatively simple, so the financial costs for the purchase and subsequent maintenance of such an engine are much lower than in the case of injection systems. The carburetor does not require electricity to operate - it only needs the air flow that the engine sucks.