The document details the specifications and components of a 2-stroke internal combustion engine, including its design, operation, and features such as the piston, crank, cylinder, and other critical parts. It highlights the engine's specifications like displacement, power output, and transmission system. Additionally, it describes the function of each component and their role in the overall operation of the engine.

1. 2-STROKE
INTERNAL
COMBUSTION
ENGINE
ELEMENTS OF MECHANICAL
ENGINEERING
KAUSHAL PATEL

2. Page | 1
SPECIFICATIONS
Type Two stroke, Air cooled, S.I engine
Bore × Stroke, mm 57/57
No. of Cylinder 1
Displacement 145.45 cc
Compression ratio 10±0.7:1
Max. Power @ rpm 4.9 kW @ 5000 rpm
Max. Torque @ rpm 10.8 N/m @ 3500 rpm
Clutch Type Wet multidisc
Transmission 4 Forward, 1 Reverse
Fuel Bifuel(CNG as main)

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PISTON
Piston is reciprocating part of internal combustion
engine. Piston of this engine consist of two piston rings
one for compression and other for lubrication. One
hemispherical surface is on top of piston. Piston is hollow
from bottom. Below the piston pin one hole for transfer
fresh charge from crank case to combustion chamber.
Connecting rod is connected to the piston pin.

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CRANK AND CRANK SHAFT
Crank is rotating part of an internal combustion engine. It
is mounted on crank shaft. It converts reciprocating
motion of piston in rotating motion. When piston comes
from TOP DEAD CENTRE to BOTTAM DEAD CENTRE crank
rotates 180⁰. Mechanism of crank and crank shaft is
fitted in crank case. Crank case is air tight because fresh
charge has to enter into crank case.
Mechanism of crank and piston
Crank

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CYLINDER
Cylinder is the heart of the engine in which the fuel is
burnt and the power is developed. Cylinder has to
withstand very high pressure and temperature because
the combustion of fuel is carried out within the cylinder.
Therefore cylinder must be cooled. Cylinder of this
engine is air cooled. Cylinder of this engine consists of
transfer port which transfers fresh charge from crank
case to combustion chamber. Volume for cylinder of this
engine is 145.45 cm³.

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CYLINDER HEAD
Cylinder head is fitted at top of
cylinder. Cylinder head is providing
space for spark plug and other
accessories. The inner surface of
cylinder head of this engine is in
completely fitting with top surface
of piston. There is one
hemispherical pit for clearance volume purpose.
SPARK PLUG
Spark plug is important device for
CNG and petrol engine. When
pressure and temperature of fuel
after compression is and this time
spark is produce and combustion of
fuel take place. Power is produce at
this time. Magnetic induction spark
plug is used in this engine. So, there is no requirement of
battery for running engine.

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FLYWHEEL
It is a heavy wheel mounted on the crank shaft of engine.
It is minimize cycle variation of speed by storing the
energy during power stroke, and same is released during
another stroke. Flywheel of this engine is also consist
powerful magnet for produce electrical energy. This
energy is utilized by spark plug and other works like
charging of battery, drive wiper motor, lighting purpose.
MECHNISM FOR SET DELAY IN SPARK PLUG
There is on strip around
flywheel which is in contact
with censor when this strip is
come in contact with censor
spark occurs.

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CLUTCH
Multidisc type clutch is used in power transmission
system of this engine. One clutch wire is connected with
operating lever of this clutch. When clutch operating
lever is pressed disc of clutch is disengages from each
other and transmission of power is stop.
GEARBOX
In gearbox of this engine there
are four spur gears. All gears are
gradually decreases in size.
Largest gear give high amount of
torque and small gear give high amount of speed. There
is one spring in side of gears which is connecting kick.