tants
01-12-2003, 03:36 PM
I just did how four stroke engines work. I did this to mabe help clear up all ya youngsters questions.
The "2-strokes" are:
1) Compression stroke
2) Combustion stroke
To start things off heres some main facts about the 2stroker engine...
-Two-stroke engines do not have valves, which simplifies their construction and lowers their weight.
-Two-stroke engines fire once every revolution, while four-stroke engines fire once every other revolution. This gives two-stroke engines a significant power boost.
These advantages make two-stroke engines lighter, simpler and less expensive to modify. Two-stroke engines also have the potential to pack about twice the power into the same space because there are twice as many power strokes per revolution. The combination of light weight and twice the power gives two-stroke engines a great power-to-weight ratio compared to many four-stroke engine designs, for instance, the Honda 250r compared to the Honda 400ex.
One difference between a 2stroke and a 4stroke motor is that a 2stroke motors spark plug only fires once every revolution compared to twice like a 4stroke engine does.
2 stroke engines have a "cross flow" design, this means that overlap operations occur in order to reduce the part count aslong as the "stroke" count.
The "2-strokes":
1) Start where the spark plug fires. Fuel and air in the cylinder have been compressed, and when the spark plug fires the mixture ignites. The resulting explosion drives the piston downward. Note that as the piston moves downward, it is compressing the air/fuel mixture in the crankcase. As the piston approaches the bottom of its stroke, the exhaust port is uncovered. The pressure in the cylinder drives most of the exhaust gases out of cylinder. As the piston finally bottoms out, the intake port is exposed. The piston's movement has pressurized the mixture in the crankcase, so it rushes into the cylinder, displacing the remaining exhaust gases and filling the cylinder with a fresh charge of fuel.
2) Now the momentum in the crankshaft starts driving the piston back toward the spark plug for the compression stroke. As the air/fuel mixture in the piston is compressed, a vacuum is created in the crankcase. This vacuum opens the reed valve and sucks air/fuel/oil in from the carburetor.
Once the piston makes it to the end of the compression stroke, the spark plug fires again to repeat the cycle. It's called a two-stoke engine because there is a compression stroke and then a combustion stroke. In a four-stroke engine, there are separate intake, compression, combustion and exhaust strokes.
You need to "mix" 2stroke oil with the gas so all the parts of the motor stay lubed, if not your motor wont be running too much longer.
The "2-strokes" are:
1) Compression stroke
2) Combustion stroke
To start things off heres some main facts about the 2stroker engine...
-Two-stroke engines do not have valves, which simplifies their construction and lowers their weight.
-Two-stroke engines fire once every revolution, while four-stroke engines fire once every other revolution. This gives two-stroke engines a significant power boost.
These advantages make two-stroke engines lighter, simpler and less expensive to modify. Two-stroke engines also have the potential to pack about twice the power into the same space because there are twice as many power strokes per revolution. The combination of light weight and twice the power gives two-stroke engines a great power-to-weight ratio compared to many four-stroke engine designs, for instance, the Honda 250r compared to the Honda 400ex.
One difference between a 2stroke and a 4stroke motor is that a 2stroke motors spark plug only fires once every revolution compared to twice like a 4stroke engine does.
2 stroke engines have a "cross flow" design, this means that overlap operations occur in order to reduce the part count aslong as the "stroke" count.
The "2-strokes":
1) Start where the spark plug fires. Fuel and air in the cylinder have been compressed, and when the spark plug fires the mixture ignites. The resulting explosion drives the piston downward. Note that as the piston moves downward, it is compressing the air/fuel mixture in the crankcase. As the piston approaches the bottom of its stroke, the exhaust port is uncovered. The pressure in the cylinder drives most of the exhaust gases out of cylinder. As the piston finally bottoms out, the intake port is exposed. The piston's movement has pressurized the mixture in the crankcase, so it rushes into the cylinder, displacing the remaining exhaust gases and filling the cylinder with a fresh charge of fuel.
2) Now the momentum in the crankshaft starts driving the piston back toward the spark plug for the compression stroke. As the air/fuel mixture in the piston is compressed, a vacuum is created in the crankcase. This vacuum opens the reed valve and sucks air/fuel/oil in from the carburetor.
Once the piston makes it to the end of the compression stroke, the spark plug fires again to repeat the cycle. It's called a two-stoke engine because there is a compression stroke and then a combustion stroke. In a four-stroke engine, there are separate intake, compression, combustion and exhaust strokes.
You need to "mix" 2stroke oil with the gas so all the parts of the motor stay lubed, if not your motor wont be running too much longer.