HONDA 2 HP OUTBOARD
Video taken on June 30, 2008
Two Or Four Stroke Engines – Which Is Right For You?
2 Stroke engines provide better speed and acceleration because they are lighter and faster. They are also cheaper and do not depreciate in value very quickly. With an 80 year history of production, spare parts abound allowing for easier repair. Since they are relatively simple in design, they have fewer mechanisms that can break, making the need for repair to be less frequent.
The main disadvantage of a 2 stroke engine is its environmental unfriendliness. 2 stroke engines are more pollutive than 4 stroke engines because they release unburned oil that pollutes the water. Manufactures are trying to innovate new types of 2 stroke engines that maintain their power without the same amount of pollution. These manufacturers include: Mercury, Nissan, Yamaha and Evinrude.
4 Stroke Outboards 4 stroke outboards are more sophisticated with a plethora of parts so there are more things to go wrong which leads to more frequent needs for repair. These repairs tend to be more expensive and spare parts are harder to find. But because they are newer the ability to purchase and repair them is getting easier all the time. Also, since they are heavier, not all boats can handle a 4 stroke outboard engine. Johnson, Honda, Mercury, Nissan, Suzuki, Tohatsu and Yamaha are some of the manufactures.
Environmentally Friendly Outboards The terms “2 stroke” and “4 stroke” are defined by the number of times the piston moves during one firing cycle of the engine. The 4 strokes of a 4 stroke engine are:
Intake stroke: Having an open intake vale, the piston falls in the chamber creating a vacuum for a mixture of air and fuel to enter the combustion chamber. Combustion stroke: Combustion of fuel presses the piston downward. In so doing, it reveals an exhaust vent and fuel inlet in the wall of the cylinder, which allows exhaust gasses out, and new air and fuel to be sucked in.
Compression stroke: When the piston rises, it seals off the exhaust vent and fuel inlet, compressing the air/fuel mixture. The spark plug ignites the air and fuel causing an explosion that drives the piston to move down again. The fuel inlet and the exhaust vent are in the wall of the cylinder, they eliminate the need for valves and the means for opening and closing them which makes 2 stroke engines much simpler in design.
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