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two stroke engine design
Transcript of two stroke engine design
By: Daniel Harvey
Intake Valve Types
Piston-controlled Inlet Port: It is a port that is molded into the cylinder wall. Controlled solely by the piston position covering and uncovering the ports, as it moves up and down in the cylinder.
Intake Valve Types
Rotary Inlet Valve: consists of a slotted disk that is attached to the crankshaft. This is what allows the air and fuel mixture to flow into the engine based on the crankshafts position in the cycle.
Occurs when the piston is moving down on the power stroke. The amount of displacement area that is in the crank case becomes less causing the intake valve to close and compress the fuel and air mixture.
Intake (Incorporating a Poppet Intake Valve)
Intake valve types
Reed Inlet Valve: It is a strip of spring steel that acts like a check valve when air is drawn in. Then the valve closes.
This is when the transfer port (Intake port for the cylinder) and the exhaust ports are on opposite sides of the cylinder. This style implements a deflector to push the fresh combustible mixture up into the top of the cylinder. This action then drives the exhaust out.
At the end of the power stroke, the piston uncovers the Inlet Port or Transfer Port, which allows pressurized fuel/air in the crankcase to escape around the piston into the main cylinder. As this happens, the piston uncovers the exhaust port in the cylinder wall. With the help of new fuel/air this pushes the exhaust gas out of the cylinder.
Air and fuel is drawn into the crankcase by the vacuum pressure that is caused by the upward stroke of the piston.
Piston-Controlled Inlet Port
This is a port that the air and fuel flow into from the crankcase after the piston uncovers it. It is pushed in by the compression caused by the piston moving down in the bore. (More on this compression action later)
The piston is then driven back up into the top of the stroke by the momentum that is still in the flywheel from the power stroke. This action compresses the fuel/air that is in the cylinder.
The fuel/air mixture is ignited at the top of the stroke (or before). The ignition event causes the expanding gas to push the piston down, transferring the energy to the crankshaft and thus completing the cycle.
It is a muffler like device that is used to reflect a pressure wave on the fuel charge. This pressure helps with volumetric efficiency and fuel economy. They are also found on high output two stroke engines.
Some Airplanes With Two Stroke Engines
Two Stroke Animation