Selecting An Outboard Engine

Outboard engines fall into two major categories; 2 stroke and four stroke outboards. Both types have their advantages and disadvantages and the type you pick will depend on the meant use. This guide will assist you 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 can be the engine of choice. They're 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 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 don't seem to be 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 contains unburned oil, which in turn pollutes the water.
With new rules, outboard manufacturers are looking to seek out new ways of producing the identical 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're also kinder to the environment. For those who’re after a quieter, smoother ride, then the 4 stroke outboard is the higher choice.
4 stroke motors have more complex engines which could lead to more repairs. When a repair is required it is often more expensive and parts are limited.
four stroke outboards are generally heavier than 2 stroke outboards, so should you own a smaller boat it might not be able to hold the load of a 4 stroke engine.
Because four stroke engines are newer, they are frequently being improved to make buy and repair easier.
Some four stroke outboard engine producers embrace Yamaha, Tohatsu, Suzuki, Nissan, Mercury, Honda and Johnson outboard after market parts.
Environmentally Friendly Outboards
In case you’re looking for a new outboard, it’s worthwhile considering one of the newer, environmentally pleasant models. Much less air pollution, reduced noise, higher fuel financial system and lower running prices are amongst the advantages.


The Mechanical Variations Between 2 and 4 Stroke Outboards
The phrases "2 stroke" and "four stroke" refer to the number of times the piston moves throughout one firing cycle of the engine. Within the 4 stroke engine, the 4 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 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 remove the necessity 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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