2 Strokes Flashcards
Describe how a 2 stroke engine works?
A two-stroke engine is a combustion engine that completes the four processes of intake, compression, power, and exhaust in only two strokes of the piston, meaning a power stroke on every revolution.
As the piston moves downward from the TDC, it uncovers the intake port, allowing a mixture of air and fuel to enter the cylinder from the crankcase or from an external source.
As the piston reaches the BDC, it begins to move upward, compressing the air-fuel mixture that has entered the cylinder.
When the piston reaches the TDC, the spark plug ignites the compressed air-fuel mixture near the top of the combustion chamber.
As the piston reaches the BDC, it uncovers the exhaust port, allowing the burned gases to escape from the cylinder.
Draw a 2 stroke cycle?
See onenote
How does a 4 stroke difference from a 2 stroke?
A 4 stroke will have inlet and exhaust valves where a 2 stroke has a scavenge space and inlet ports.
A 2 stroke will have a crosshead bearing connecting the piston and conrod together.
Smaller two strokes have the fuel and oil mixed together.
List the cylinder head components on a large 2 stroke marine diesel?
- Air start valve
- Indicator valve
- Fuel valve
- Exhaust valve
- Safety valve
