Outboard engines fall into principal classes; 2 stroke and four stroke outboards. Both types have their advantages and disadvantages and the type you pick will depend upon the supposed use. This guide will provide help to choose which outboard engine is best on 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 also more affordable and have a higher resale value. As 2 stroke engines have been round for nearly eighty years, parts are readily available, making repairs easy. Additionally, 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 2 stroke engine. 2 stroke engines are more pollute than 4 stroke engines so they don’t seem to be so kind on the environment. Their engines are lubricated by the oil that’s mixed into the gasoline, that means the exhaust is smoky and contains unburned oil, which in turn pollutes the water.
With new rules, outboard producers are looking to search out new ways of producing the same power with less pollution.
4 Stroke Outboards
four stroke engines are quieter, smoother and more economical. Heavier with slower acceleration, they’re normally chosen for lakes and rivers. With less pollution and smoke they are additionally kinder to the environment. If you’re after a quieter, smoother ride, then the 4 stroke outboard is the better choice.
four stroke motors have more advanced engines which might lead to more repairs. When a repair is required it is usually more expensive and parts are limited.
4 stroke outboards are generally heavier than 2 stroke outboards, so when you own a smaller boat it may not be able to hold the burden of a 4 stroke engine.
Because 4 stroke engines are newer, they are continually being improved to make purchase and repair easier.
Some 4 stroke outboard engine producers embody 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 many newer, environmentally friendly models. Less air pollution, reduced noise, higher fuel financial system and lower running prices are amongst the advantages.
The Mechanical Variations Between 2 and four Stroke Outboards
The phrases «2 stroke» and «four stroke» discuss with the number of instances 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 permitting a mixture 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 mixture 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 can be repeated.
In a 2 stroke engine, there are only two 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 within the wall of the cylinder permitting 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 within the wall of the cylinder eradicate the need for valves and the mechanism for opening and shutting them which is why 2 stroke engines are a lot easier in design.
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