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outboards motors

What Outboard – 4 Stroke or 2 stroke?

outboard motors fall into two main categories: 2-stroke engines and 4 stroke outboard. Both types have their advantages and disadvantages and the type chosen will depend on the intended use. This guide will help you choose which engine out of board is best for your type of boat.

2 Stroke outboards

2 two-stroke engines are lighter and faster so when speed and acceleration are required, this would be the engine of choice. 2 strokes are also usually cheaper and keep your best value when it comes to further resale. As 2-stroke engines have been around for almost 80 years, parts are readily available, facilitating repairs. Furthermore, the design of these engines is less complex than 4-stroke, meaning problems are less likely to arise.

There are some disadvantages to the 2-stroke engine. 2-Stroke Engines 4 more polluting two-stroke engines so they are not as friendly in the environment. Their engines are lubricated by oil mixed with gasoline, ie, gases exhaust is smoky and contains unburned oil, which in turn pollutes the water.

With new regulations, manufacturers of outboard is looking for find new ways to produce the same energy with less pollution.

Some manufacturers of outboard motor 2 stroke include Mercury, Nissan, Yamaha and Evinrude.

4 Stroke Outboards

Four two-stroke engines are quieter, smoother and more economical. Heavier less acceleration, that are normally chosen for lakes and rivers. With less pollution and smoke are also kinder to the environment. If you are looking for a quieter, more smooth ride, then the outboard motor 4 stroke is the best choice.

Outboard 4 stroke are more complicated with more parts therefore often require more frequent repairs. When repair is needed it is usually more expensive and parts are limited.

Four outboard engines strokes are generally heavier than outboards two stroke, so if you own a smaller boat can not be able to withstand the weight of a 4-stroke engine.

Because four two-stroke engines are newer, which are continually being improved to make it easier the purchase and repair.

Some manufacturers of outboard motor 4 stroke include Yamaha, Tohatsu, Suzuki, Nissan, Mercury, Honda and Johnson.

Outboard motors ecological

If you are looking for a new outboard motor, it is worth considering one of the newer ecological models. Also produce less emissions, there are a number of other advantages such as better fuel economy, quieter operation and lower operating costs.

The Mechanics Differences between 2 and 4 Stroke outboards

The terms "two times" and "4 stroke" refer to the number of times the piston moves during one firing cycle of the engine. In the 4-stroke engine, the four movement or impact, are:

intake stroke: When the valve open admissions, the piston moves down to allow a mixture of air and fuel entering the combustion chamber.

compression stroke: The piston moves up the cylinder with the valves closed, so that the air-fuel mixture is compressed.

Combustion stroke: With valves still closed, the fuel is ignited by the spark plug. The explosion pushes the piston down again.

escape movement: Valve exhaust opens and the piston moves upward to push the exhaust gases of the camera so that the process can be repeated.

In a 2-stroke engine, only There are two movements of the piston for each combustion; one above and one below:

burning times: The combustion of fuel for the units to piston down. As the piston moves down, it presents an exhaust vent and fuel inlet in the wall of the cylinder allowing exhaust gas out and new air and fuel to be sucked in.

compression stroke: As the piston moves back up, blocking the vent and inlet fuel and thus compresses the air / fuel mixture. The candle lights up the air and fuel causing the piston down again.

The fuel inlet and ventilation in the wall of the cylinder valves eliminate the need for and the mechanism of opening and closing them, which is why 2-stroke engines are much more simple in design.

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