Two Stroke
The two stroke engine is very different from the four stroke engine. The two strokes main difference is that it only uses two strokes of motion to convert fuel into mechanical power rather than the four strokes used in the Otto Cycle engine. The two stroke also gets more power because each revolution of the crankshaft produces a power pulse. It uses only two strokes of motion and gets more power strokes because of it. Though these engines may give more power they are not used for production vehicles.
The two stroke engine does everything the normal four stroke engines do with just less time and fewer parts. The first intake stroke happens when the bottom of the piston pulls the fuel/air mixture into the cylinder by causing a vacuum. While the fuel/air mixture is being pulled into the bottom of the crank case the other gasses at the top of the piston are being compressed and ready to be ignited. This means that the intake stroke and compression stroke are happening simultaneously. Then when the compressed fuel is ignited the piston is forced downward (power stroke) and the fuel at the bottom of the piston is forced to the top of the piston through tiny slits on the inner walls of the cylinder. When the fuel from the bottom of the cylinder is forced above the piston the exhaust from the ignition of the first compression stroke is then pushed out an exhaust port on the other side of the cylinder. At that moment the piston rises and compression starts over again and fuel is sucked into the crank case to be ready for the next stroke. With this cycle the engine has more power, but is less efficient because the gas that pushes out the exhaust can get sucked out through the exhaust port as well.
Pictures for the 'Two Stroke Engine' are comming soon, sorry for the inconvenience.
Pin Point Info:
- Uses two strokes of motion to convert fuel into mechanical power
- Creates a form of power called a power pulse, which creates more power for the engine
- These engines give more power in less time but are not used in the cars of today
- The main uses of these engines are for public transportation vehicles such as busses and trains
- Also used for dirt bikes, quads, dune buggies, and other recreational off-road vehicles
- The process for the two stroke is in a simpler form than a four stroke because it has less parts
- The bottom of the piston draws the fuel/air mixture into the cylinder by cuasing a vaccum
- While the piston is in the compression stroke it is also pulling in more fuel into the lower cavity of the cylinder
- When ignition takes place the piston is forced downward, thus pushing the fuel from the lower part of the cylinder up through slits in the walls of the cylinder
- When that happens the new fuel pushes out the exhaust through the exhaust port in the side of the cylinder walls
- Then these steps keeps repeating until the fuel is cut of from the cylinder