The document discusses two-stroke engines, including who invented them, their parts and operation, types of stroke engines, and advantages and disadvantages of two-stroke engines. Key points: - Two-stroke engines were invented in 1885 by Dugald Clerk. They have fewer moving parts than four-stroke engines and complete one cycle per revolution of the crankshaft. - Parts include the cylinder head, intake and transfer ports, piston, crankcase, and connecting rod. During operation, the intake/suction, compression, expansion/power, and exhaust stages occur. - Advantages are being more compact, lighter weight, simpler design, easier/cheaper to manufacture. Disadvantages

1. Presented By
Subrata Kumar Sarker
B.S.C in Textile Engineering (Evening)
ID: 151014002

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Who Invented the two stroke engine ?
What is two stroke engine & Different parts of it?
Different types of stroke engine?
How two stroke engine work?
Compare between Four & Two stroke engine?
Advantage of two stroke engine?
Disadvantage of two stroke engine?

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Different parts of it
Glow plug, Cylinder head, Intake port
Connecting rod, Crankshaft, Cooling
fans, Piston, transfer port & crankcase

6. * Intake/Suction stage: In this stage the piston while going
down towards bottom dead center uncovers both the transfer
port & the exhaust port. The fresh fuel-air mixture flows into
the engine cylinder from the crank case.
Compression stage: In this stage the piston while moving up
first covers the transfer port and then exhaust port. After
that the fuel is compressed as the piston moves upward. In
this stage the inlet port opens and the fresh fuel-air mixture
enters into the crank case.

7. * Expansion/Power Stage
Exhaust stage

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9. *One cycle completed in
every revolution of crank
shaft
*No valves but ports are used
for admission and exhaust
*Less moving parts
*Less maintenance
*Light in weight
*Less expensive
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*One cycle completed in
every 2 revolution of the
crank shaft
*Valves are used for charge
admission and exhaust
*More moving parts
*More maintenance
*Heavy in weight
*More expensive

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One cycle completed in every revolution of crankshaft
It is more compact required less space and lighter in weight
than four stroke engine
The design & construction is much simpler than four stroke
engine
Easy to manufacture & low cost

11. *Disadvantage of two stroke engine
 Flow is choked during combustion due to high pressure
differential and small clearance area
 The friction and wear at the ball piston cylinder wall
sliding interface
 Leakage through the ball piston cylinder gap is a
significant factor for engine deficiency at low speed