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Presentation (1).pptx
1. 2 STROKE & 4 STROKE
ENGINES
Presented by Aban Siddiqui
Id Number: 1392-2021
2. 2 STROKE ENGINE
• As the name implies, the two stroke engine only requires two piston
movements (one cycle) in order to generate power. The engine is able do
produce power after one cycle because the exhaust and intake of the gas
occurs simultaneously. There is a valve for the intake stroke that opens and
closes due to changing pressures. In addition, due to its frequent contact with
moving components, the fuel is mixed with oil to add lubrication, allowing
smoother strokes.
3. • Overall, a two-stroke engine contains two processes:
• Compression stroke: The inlet port opens, the air-fuel mixture enters the
chamber and the piston moves upwards compressing this mixture. A spark
plug ignites the compressed fuel and begins the power stroke.
• Power stroke: The heated gas exerts high pressure on the piston, the piston
moves downward (expansion), waste heat is exhausted.
4. 4 STROKE ENGINE
• The four-stroke engine is the most common types of internal combustion
engines and is used in various automobiles (that specifically use gasoline as
fuel) like cars, trucks, and some motorbikes (many motorbikes use a two
stroke engine). A four stroke engine delivers one power stroke for every two
cycles of the piston (or four piston strokes)
5. • Intake stroke: The piston moves downward to the bottom, this increases the
volume to allow a fuel-air mixture to enter the chamber.
• Compression stroke: The intake valve is closed, and the piston moves up the
chamber to the top. This compresses the fuel-air mixture. At the end of this stroke,
a spark plug provides the compressed fuel with the activation energy required to
begin combustion.
• Power Stroke: As the fuel reaches the end of it’s combustion, the heat released
from combusting hydrocarbons increases the pressure which causes the gas to push
down on the piston and create the power output.
• Exhaust stroke: As the piston reaches the bottom, the exhaust valve opens. The
remaining exhaust gas is pushed out by the piston as it moves back upwards.
