ENGINES EXPLAINED, TYPES OF ENGINES, MEO CLASS 4 EXAM, DIFFERENT TYPES OF ENGINES, PARTS OF AN ENGINE, RECIPROCATING ENGINES, IC ENGINES, EC ENGINES, COMPRESSION IGNITION, SPARK IGNITION, TWO STROKE ENGINES, CARBURATOR, CROSSFLOW SCAVENGED ENGINES, PETROL ENGINES,TWO STROKE ENGINES, TWO STROKE PETROL ENGINE,DIRT ENGINES, DIRT RACE, YAMAHA RX100

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3. In two stroke cycle engines,
the whole sequence of events.
i.e.,
suction,
compression,
power
and exhaust
are completed in two strokes of the piston
i.e. one revolution of the crankshaft.
1
2
3
4
5
1. Spark plug
2. Exhaust port
3. Transfer port
4. Inlet port
5. crankcase
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4. There is no valve in this type of engine. Gas movement
takes place through holes called ports in the cylinder.
The crankcase of the engine is air tight in which the
crankshaft rotates.
1
2
3
1. Exhaust port
2. Transfer port
3. Suction port
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5. When the piston moves upward it covers two of
the ports, the exhaust port and transfer port,
which are normally almost opposite to each
other.
This traps the charge of air- fuel mixture drawn
already in to the cylinder.
1
2
1. Transfer port
2. Exhaust port
Upward stroke (Suction + Compression)
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6. Further upward movement of the piston
compresses the charge and also uncovers the suction
port.
Now fresh mixture is drawn through this port
into the crankcase.
Just before the end of this stroke, the mixture
in the cylinder is ignited by a spark plug.
Thus, during this stroke both suction and
compression events are completed.
1
2
3
1. Spark plug
2. Inlet port
3. Crankcase
Upward stroke (Suction + Compression)
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7. Burning of the fuel rises the temperature and
pressure of the gases which forces
the piston to move down the cylinder.
When the piston moves down, it closes the
suction port, trapping the fresh charge drawn
into the crankcase.
1
2
1. Suction port
2. Trapped fresh charge
inside crankcase
Downward stroke (Power + Exhaust)
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8. Further downward movement of the piston uncovers
first the exhaust port and then the transfer port.
Now fresh charge in the crankcase moves in to the
cylinder through the transfer port driving out the
burnt gases through the exhaust port.
1
2
1. Transfer port
2. Exhaust port
Downward stroke (Power + Exhaust)
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9. Special shaped piston crown deflect the
incoming mixture up around the cylinder so
that it can help in driving out the exhaust
gases .
During the downward stroke of the piston
power and exhaust events are completed.
1
1.Special shaped
piston crown
SPECIAL SHAPED PISTON CROWN
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10. A carburetor is a device that mixes air and
fuel for internal combustion engines in
the proper air–fuel ratio for combustion.
CARBURETOR
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11. The carburetor works on Bernoulli's principle, the
faster air moves, the lower its static pressure, and
higher the dynamic pressure is.
The throttle (accelerator) linkage does not directly
control the flow of liquid fuel. Instead, it actuates
carburetor mechanisms which meter the flow of air
being carried into the engine. The speed of this flow,
and therefore its (static) pressure, determines the
amount of fuel drawn into the airstream.
CARBURETOR
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12.  two-stroke engines have a greatly reduced number of moving parts, and so can be
more compact and significantly lighter.
 One power stroke for each revolution of the crankshaft. = 2x power of four stroke
 There are inlet and exhaust ports instead of valves.
 Both sides of the piston compress the Charge
ADVANTAGES
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13.  Size of the flywheel is comparatively smaller.
 Weight of engine per hp is comparatively low.
 For same weight, two stroke engine gives twice the power that of four stroke
engine.
 It can be operated in both direction (clockwise and counter clockwise).
 Cheaper, less complex and easier to work
 Can work in any orientation (upside down, sideways)
ADVANTAGES
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14. DISADVANTAGES
 Fuel is not fully consumed.
 Removal of exhaust gases comparatively
 difficult.
 Torque produced is less even.
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