Outboard engines fall into two principal categories; 2 stroke and 4 stroke outboards. Each types have their advantages and disadvantages and the type you pick will rely upon the supposed use. This guide will allow you to select which outboard engine is finest for your type of boat.
2 Stroke Outboards
2 stroke engines are lighter and faster so when speed and acceleration are required, this would be the engine of choice. They are additionally more affordable and have a higher resale value. As 2 stroke engines have been around for nearly 80 years, parts are readily available, making repairs easy. Also, the design on these engines is less complex than a 4 stroke, that means problems are less likely to arise.
There are some disadvantages to the two stroke engine. 2 stroke engines are more pollute than four stroke engines so they aren’t so kind on the environment. Their engines are lubricated by the oil that’s blended into the gasoline, which means the exhaust is smoky and incorporates unburned oil, which in turn pollutes the water.
With new regulations, outboard manufacturers are looking to find new ways of producing the identical power with less pollution.
4 Stroke Outboards
four stroke engines are quieter, smoother and more economical. Heavier with slower acceleration, they are normally chosen for lakes and rivers. With less air pollution and smoke they are additionally kinder to the environment. In the event you’re after a quieter, smoother ride, then the four stroke outboard is the higher choice.
4 stroke motors have more advanced engines which could lead to more repairs. When a repair is required it is normally more costly and parts are limited.
four stroke outboards are typically heavier than 2 stroke outboards, so if you happen to own a smaller boat it might not be able to hold the weight of a 4 stroke engine.
Because four stroke engines are newer, they are regularly being improved to make purchase and repair easier.
Some four stroke outboard engine producers embrace Yamaha, Tohatsu, Suzuki, Nissan, Mercury, Honda and Johnson outboard after market parts.
Environmentally Pleasant Outboards
When you’re looking for a new outboard, it’s worthwhile considering one of many newer, environmentally friendly models. Much less pollution, reduced noise, better fuel economic system and lower running prices are amongst the advantages.
The Mechanical Differences Between 2 and four Stroke Outboards
The terms «2 stroke» and «4 stroke» consult with the number of occasions the piston moves during one firing cycle of the engine. Within the four stroke engine, the four movements, or strokes, are:
Intake stroke: With the intake valve open, the piston moves down allowing a combination of air and fuel to enter the combustion chamber.
Compression stroke: The piston moves up the cylinder with the valves closed, so that the air-fuel combination is compressed.
Combustion stroke: With the valves still closed, the fuel is ignited by the spark plug. The explosion pushes the piston down again.
Exhaust stroke: The exhaust valve opens and the piston moves as much as push the exhaust gasses out of the chamber so the process may be repeated.
In a 2 stroke engine, there are only movements of the piston for every combustion; one up and one down:
Combustion stroke: Combustion of fuel drives the piston downwards. As the piston moves down, it exposes an exhaust vent and fuel inlet in the wall of the cylinder allowing exhaust gasses out, and new air and fuel to be sucked in.
Compression stroke: Because the piston moves back up, it blocks off the exhaust vent and fuel inlet and thus compresses the air/fuel mixture. The spark plug ignites the air and fuel inflicting the piston to move down again.
The fuel inlet and the exhaust vent in the wall of the cylinder eliminate the necessity for valves and the mechanism for opening and closing them which is why 2 stroke engines are much easier in design.
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