Outboard motors are divided into two main categories, 2-stroke and 4-stroke outboard engines. Both types have their advantages and disadvantages and the type you get depends on the intended use. This guide will help you, the outboard motor is best for your type of boat.
2-stroke outboard
2-stroke engines are lighter and faster so that, if the velocity and acceleration are required, this would be the engine of choice. 2-stroke engines are also cheaper and hold their value betterwhen it comes to resale. Are 2-outboards are already saved so easily, so that repairs less disruptive for over 80 years. The design of these engines is less complex than a 4-stroke, meaning problems are less likely.
There are some drawbacks, the 2-stroke engine. 2-stroke engines are bad for the environment 4-stroke engines, so they are not so friendly to the environment. They are due to engine oil that is blended into gasoline is lubricated, which meansthe exhaust is smoky and contains unburned oil, which in turn pays the water.
With the new regulations, outboard manufacturers are looking for new ways to make the same power found in less pollution.
Some 2-stroke outboard engine manufacturers include Mercury, Nissan, Yamaha and Evinrude.
A 4-stroke outboard
4-stroke engines are quieter, smoother and cheaper. Heavier with slower acceleration, they are usually chosen for lakes and rivers. With less pollutionsmoke and are also gentler on the environment. If you are after a run quieter, smoother, then the engine 4-stroke outboard is the best choice.
A 4-stroke outboards are more complicated with multiple parts, so that often require frequent repairs. If repairs are needed, they tend to be expensive and parts can be difficult to source.
4-stroke outboards are generally heavier than 2 stroke outboards, so if you have a smaller boat may not be able to withstand the weight of a 4-strokeEngine.
Since 4-stroke engines are newer, have steadily improved, easier to buy and repair.
Manufacturers of 4-stroke outboards include Johnson, Honda, Mercury, Nissan, Suzuki, Yamaha and Tohatsu.
Outboard ecological
If you are looking for a new outboard motor, it's worth considering one of the newer, more environmentally friendly models. Less pollution, less noise, lower fuel consumption and lower operating costs are among theBenefits.
The mechanical differences between 2 and 4 stroke outboard
The terms "2 stroke" and "4 times" refers to the number of times the piston moves during a switching cycle of the engine. In the 4-stroke engine, the four movements, or strokes, are as follows:
Intake: the intake valve opens, the piston moves downwards resulting in a mixture of air and fuel into the combustion chamber.
Compression stroke: the piston moves the cylinder with the valve closed, so that theAir-fuel mixture is compressed.
Combustion stroke: With the valves still closed, the fuel is ignited by the spark plug. The explosion pushes the piston down.
The valve can be opened and the piston moves up to push the exhaust gases from the chamber so that the process can be repeated: the exhaust stroke.
In a 2-stroke engine, there are only two movements of the piston for each combustion, one above and one below:
Combustion cycle: Combustion of fuel drives the pistondown. As the piston moves down, set an inlet port and fuel in the cylinder wall is from the exhaust and new air and fuel are drawn to
Compression stroke: As the piston moves back, blocked the exhaust and intake valve of the fuel and then compresses the air / fuel mixture. The candle lights the fuel and air to move the piston down.
The supply of fuel and the exhaust valve in the wall of the cylinder valves and eliminates the need forthe mechanism of opening and closing so two-stroke engines are much simpler.
