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Unformatted text preview: trol engines (also called spark ignition engines or S.I
engines), the correct proportion of air and petrol is mixed
in the carburettor and fed to engine cylinder where it is
ignited by means of a spark produced at the spark plug. In
diesel engines (also called compression ignition engines
or C.I engines), only air is supplied to the engine cylinder
during suction stroke and it is compressed to a very high
pressure, thereby raising its temperature from 600°C to
1000°C. The desired quantity of fuel (diesel) is now injected
into the engine cylinder in the form of a very fine spray and
gets ignited when comes in contact with the hot air.
The operating cycle of an I.C. engine may be
completed either by the two strokes or four strokes of the
CONTENTS 1126 n A Textbook of Machine Design piston. Thus, an engine which requires two strokes of the piston or one complete revolution of the
crankshaft to complete the cycle, is known as two stroke engine. An engine which requires four
strokes of the piston or two complete revolutions of the crankshaft to complete the cycle, is known as
four stroke engine.
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This note was uploaded on 09/30/2012 for the course MECHANICAL 403 taught by Professor A.thirumoorthy during the Spring '11 term at Anna University Chennai - Regional Office, Coimbatore.
- Spring '11