Outboard engines fall into main classes; 2 stroke and 4 stroke outboards. Each types have their advantages and disadvantages and the type you pick will depend on the intended use. This guide will assist you to select which outboard engine is best to your type of boat.
2 Stroke Outboards
2 stroke engines are lighter and faster so when speed and acceleration are required, this could 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 eighty years, parts are readily available, making repairs easy. Also, the design on these engines is less complicated than a four 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 combined into the gasoline, which means the exhaust is smoky and contains unburned oil, which in turn pollutes the water.
With new laws, outboard producers are looking to seek out new ways of producing the same power with less pollution.
four Stroke Outboards
4 stroke engines are quieter, smoother and more economical. Heavier with slower acceleration, they’re usually chosen for lakes and rivers. With less air pollution and smoke they are additionally kinder to the environment. If you happen to’re after a quieter, smoother ride, then the 4 stroke outboard is the better choice.
4 stroke motors have more advanced engines which could lead to more repairs. When a repair is required it is often more expensive and parts are limited.
4 stroke outboards are typically heavier than 2 stroke outboards, so in the event you own a smaller boat it is probably not able to hold the weight of a 4 stroke engine.
Because 4 stroke engines are newer, they’re continually being improved to make buy and repair easier.
Some four stroke outboard engine manufacturers embrace Yamaha, Tohatsu, Suzuki, Nissan, Mercury, Honda and Johnson outboard after market parts.
Environmentally Friendly Outboards
If you’re looking for a new outboard, it’s worthwhile considering one of the newer, environmentally friendly models. Less air pollution, reduced noise, higher fuel economy and lower running costs are amongst the advantages.
The Mechanical Differences Between 2 and four Stroke Outboards
The phrases «2 stroke» and «four stroke» discuss with the number of occasions the piston moves during one firing cycle of the engine. In the four stroke engine, the 4 movements, or strokes, are:
Intake stroke: With the intake valve open, the piston moves down permitting a mixture of air and fuel to enter the combustion chamber.
Compression stroke: The piston moves up the cylinder with the valves closed, in order 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 up to push the exhaust gasses out of the chamber so the process could be repeated.
In a 2 stroke engine, there are only movements of the piston for each 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 within 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 causing the piston to move down again.
The fuel inlet and the exhaust vent in the wall of the cylinder eliminate the need for valves and the mechanism for opening and closing them which is why 2 stroke engines are a lot simpler in design.
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