Outboard engines fall into two major categories; 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 aid you select which outboard engine is finest on 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 round for almost 80 years, parts are readily available, making repairs easy. Additionally, the design on these engines is less complicated than a 4 stroke, meaning problems are less likely to arise.
There are some disadvantages to the 2 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 is mixed into the gasoline, that means the exhaust is smoky and incorporates unburned oil, which in turn pollutes the water.
With new regulations, outboard manufacturers are looking to search out new ways of producing the identical energy 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 pollution and smoke they’re additionally kinder to the environment. For those who’re after a quieter, smoother ride, then the four stroke outboard is the better choice.
4 stroke motors have more complex engines which might lead to more repairs. When a repair is required it is usually more expensive and parts are limited.
four stroke outboards are usually heavier than 2 stroke outboards, so if you happen to own a smaller boat it may not be able to hold the load of a four stroke engine.
Because 4 stroke engines are newer, they’re frequently being improved to make purchase and repair easier.
Some four stroke outboard engine manufacturers embrace Yamaha, Tohatsu, Suzuki, Nissan, Mercury, Honda and Johnson outboard after market parts.
Environmentally Pleasant Outboards
In case you’re looking for a new outboard, it’s worthwhile considering one of the newer, environmentally pleasant models. Much less pollution, reduced noise, higher fuel economy and lower running prices are amongst the advantages.
The Mechanical Variations Between 2 and four Stroke Outboards
The terms „2 stroke“ and „four stroke“ discuss with the number of instances the piston moves during one firing cycle of the engine. Within the 4 stroke engine, the four movements, or strokes, are:
Intake stroke: With the intake valve open, the piston moves down permitting 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 will 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. Because 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 causing the piston to move down again.
The fuel inlet and the exhaust vent within the wall of the cylinder get rid of 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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