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Engine Cylinder

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Engine Cylinder
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Outboard engines fall into two main categories; 2 stroke and 4 stroke outboards. Both types have their advantages and disadvantages and the type you pick will depend on the intended use. This guide will help you choose which outboard engine is best for 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. 2 strokes are also generally cheaper and keep their value better when it comes to resale. 2 stroke outboards have been in existence for about 80 years so spares are easily found, making repairs less troublesome. Also, the design on these engines is less complex 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 pollutive than 4 stroke engines so they are not so kind on the environment. Their engines are lubricated by the oil that is mixed into the gasoline, meaning the exhaust is smoky and contains unburned oil, which in turn pollutes the water.

With new regulations, outboard manufacturers are looking to find new ways of producing the same power with less pollution.

Some 2 stroke outboard engine manufacturers include Mercury, Nissan, Yamaha and Evinrude.

4 Stroke Outboards

4 stroke engines are quieter, smoother and more economical. Heavier with slower acceleration, they are normally chosen for lakes and rivers. With less pollution and smoke they are also kinder to the environment. If you're after a quieter, smoother ride, then the 4 stroke outboard is the better choice.

4 stroke outboards are more complicated with more parts so they often require repairs more often. When repairs are needed they tend to be more expensive and spare parts can be harder to source.

4 stroke outboards are generally heavier than 2 stroke outboards, so if you own a smaller boat it may not be able to hold the weight of a 4 stroke engine.

Because 4 stroke engines are newer, they are continually being improved to make purchase and repair easier.

Manufacturers of 4 stroke outboards include Johnson, Honda, Mercury, Nissan, Suzuki, Tohatsu and Yamaha.

Environmentally Friendly Outboards

If you're looking for a new outboard, it's worthwhile considering one of the newer, environmentally friendly models. Less pollution, reduced noise, better fuel economy and lower running costs are amongst the advantages.

The Mechanical Differences Between 2 and 4 Stroke Outboards

The terms "2 stroke" and "4 stroke" refer to the number of times the piston moves during one firing cycle of the engine. In the 4 stroke engine, the four movements, or strokes, are:

Intake stroke: With the intake valve open, the piston moves down allowing 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 up to 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 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 in the wall of the cylinder allowing exhaust gasses out, and new air and fuel to be sucked in.

Compression stroke: As 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 much simpler in design.

Additional boats and outboards information can be cound on TheYachtMarket.com

Vw Radiator Fan---cooling Off the Mean Engine Performance of the “people's Car”

The Volkswagen engine packs a mean combustion process that goes way beyond normal temperature level. This is important in order to have an efficient combustion process on the air/fuel mixture inside the engine cylinder. A certain amount of percentage of fuel is converted to heat along the process. But if this heat goes into excess levels, chances are, it will melt out the internal parts of the engine. The pistons expand that they would not be able to fit the cylinders. Thus, overheating may occur. It is in this premise that a cooling system is required to keep engine temperature at bay and to prevent it from overheating. Not only that, the cooling system makes use of this excess heat to warm up the innards of the vehicle during cold weather. The two types of cooling system in the Volkswagen consist of: a) liquid cooling and b) air cooling. On the former, a liquid which is commonly called a coolant (usually water mixed with anti-freeze) circulates through the pipes and and passageways along the confines of the engine. It absorbs the heat from the engine and goes out to pass through the heat exchanger (or radiator) to transfer this heat to the air blowing through the exchanger. While for the air-cooling type of system, the engine block is concealed in aluminum fins that conduct the heat away form the cylinder. A fans blows off potently over the fins, cooling out the engine by venting this heat through the air. Be it a condenser fan or an automotive fan, the VW Radiator Fan draws air outside the radiator, aiding the radiator to dissipate heat more conveniently. Snugged fit in front of the radiator, the VW Radiator Fan comprises vital elements like the fan blade, fan motor, fan belt, fan clutch and fan shrouds. Different specifications may be preferred as to the blades. The configurations may vary according to the needs of the owner, like the blades may be ranging from four to eleven blade set-ups. Usually made of high-grade plastic, these blades spin at top speeds to help the radiator in cooling off the heat passing through its fins. But it should not be at all times that the VW Radiator Fan be spinning at optimum speeds. Like the thermostat, it has to be regulated to maintain the ideal engine temperature. A thermostatic switch or a computerized chip signals the VW fan to activate when the temperature of the coolant goes beyond set point. They turn back off when the temperature goes below it. As for rear-wheel drive Volkswagens with longitudinal engines, an engine-driven VW fan is mounted. The one that acts as the thermostat is the clutch, installed at the fan's hub. They are very much alike with the viscous coupling found in some all-wheel drive Volkswagen cars. With the different specifications of the VW Radiator Fan according to the desired requirements auto parts dealerships provide a wide range of fan assemblies for the different Volks vehicles---be them model or year. Over at cyberspace, a great deal of inventory of fan assemblies await for online purchasers, with great deals on the parts, themselves. The buying public is assured that these products are not run-on-the-mill types, as they are precision-made to meet the strictest standards that even exceed industry expectations.

About the Author

John Garret is an automobile mechanic who knows every crook and cranny of his truck. He's also a vintage car enthusiast, and he's dedicated to fixing and restoring them. He is a motorist who believes in continuous research and improvement.

How much pressure created during combustion in a petrol engine cylinder?

ill give you the figure that you are looking for. a well tuned engine will develop a pressure, the ignition of the compressed gas in that cylinder will increase the pressure to 4 time that pressure. so if you have an engine developing about 150 psi in a cylinder, the combustion pressure is 600 psi in that cylinder.

Next-generation Mini Cooper to receive three-cylinder engine
The three-cylinder engine that BMW has been working on to power the next-generation BMW 1-Series is also likely to be put in the next-gen Mini Cooper too, according to a Motoring File report.

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