Advance I.C. Engines TAE-II Power Point

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ADVANCE I.C. ENGINES
TAE-II
POWER POINT PRESENTATION
Name Of Topic:
Comparison Between SI and CI
Engines
Prepared ByAdneya S. Deodhar
Mech.6th Semester Sec-A
Roll No- 05
HEAT ENGINE
Definition: “Heat engine is a device which transforms the chemical
energy of fuel into thermal energy and utilizes this thermal energy to
perform useful work. ”
 Thus using heat engine thermal energy is converted to mechanical
energy in a heat engine. Heat engines classification is given below
1. Internal Combustion Engines (IC Engines)
A. Rotary IC Engines
i.
Open Cycle Gas Turbine
ii.
Wankel Engine
B. Reciprocating IC Engines
i.
Gasoline Engine (SI Engine)
ii.
Diesel Engine
(CI Engine)
2. External Combustion Engines (EC Engines)
A. Rotary EC Engines
i.
Steam Turbine
ii.
Closed Cycle Gas Turbine
B. Reciprocating EC Engines
i.
Steam Engine
ii.
Stirling Engine

SPARK IGNITION ENGINE (SI ENGINE)

The credit of invention of SI engine goes to
Nicolaus A. Otto(1876). Therefore SI engine is
also called as Otto Engine
Four Stroke SI Engine
•In a four stroke engine the cycle of operation is completed in four
strokes of piston or two revolutions of crank shaft. During four strokes
there are five events to be completed viz. suction , compression,
combustion, expansion and exhaust. Each stroke consist of 180 degree of
crankshaft rotation. The cycle of operation for an ideal four stroke SI
engine consist of following strokes
1. Suction or intake stroke
2. Compression stroke
3. Expansion or power stroke
4. Exhaust stroke
Cycle of operation is shown in Fig.
Working Of Four Stroke SI engine
IDEAL & ACTUAL PV DIAGRAM FOR 4
STROKE SI ENGINE
Ideal PV diag.
Actual PV diag.
SECTIONAL VIEW OF SI ENGINE
ANIMATION SHOWING WORKING OF SI
ENGINE
COMPRESSION IGNITION ENGINE
(CI ENGINE)

The credit of invention of CI engine goes to
Rudolf Diesel (1892).
Four Stroke CI Engine
•The four stroke CI Engine is similar to the four stroke SI engine but
it operates at much higher compression ratio . The compression ratio
for SI engine is between 6 to 10 while for CI engine it is between 16
to 20.
Working operation of CI engine is shown in fig.
WORKING OF FOUR STROKE CI ENGINE
FOUR STROKE CI ENGINE
PV DIAGRAM FOR FOUR STROKE CI
ENGINE
ANIMATION SHOWING WORKING OF CI
ENGINE

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