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1. BRAINWARE UNIVERSITY
TOPIC -4 STROKE ENGINE
NAME –Sumankanrar
STUDENT CODE –BWU/DME/21/030
SUBJECT -Heat transfer & I C engine.
SUBJECT CODE-DMD-404
DEPARTMENT -Mechanical engineering

2. OBJECTIVE
introduction .
Basic components of a four-stroke engine
The four-stroke cycle
Advantages & Disadvantage

3. introduction
A four-stroke engine is an internal combustion engine
that utilises four distinct piston strokes (intake,
compression, power, and exhaust) to complete one
operating cycle. A complete operation in a four-stroke
engine requires two revolutions (720*) of the crankshaft

4. Basic Components of Four-Stroke
Engines
Intake Valve
Valve Cover
Intake Port
Head
Coolant
Engine Block
Oil Pan
Oil Sump
Crankshaft
Camshaft
Exhaust Valve
Spark Plug
Exhaust Port
Piston
Connecting Rod
Rod Bearings

5. The 4-Stroke Cycle
A four-stroke engine is an internal combustion engine
that utilises four distinct piston strokes (intake,
compression, power, and exhaust) to complete one
operating cycle

6. Suction/Intake Stroke
Key points
Inlet Valve –Open
Outlet Valve –Closed
Crankshaft Rotation –180*
Piston -TDC -BDC

7. COMPRESSION STROKE
Key points
Inlet Valve –Closed
Outlet Valve –Closed
Crankshaft Rotation –180* (Total 360*)
Piston –BDC -TDC
TEMP –250*c –350*c
PRESSURE –6 –12 kg/cm^2

8. Power/Combustion Stroke
Key points
Inlet Valve –Closed
Outlet Valve –Closed
Crankshaft Rotation –180* (Total 540*)
Piston -TDC -BDC
TEMP –1800*c –2500*c
PRESSURE –30 –40 kg/cm^2

9. Exhaust Stroke
Key points
Inlet Valve –Closed
Outlet Valve –Open
Crankshaft Rotation –180* (Total 720*)
Piston –BDC-TDC

10. Advantages
4 stroke engines have greater fuel eciencythan 2 stroke
ones because fuel is consumed once every 4 strokes.
As power is generated once every 4 strokes & also as no
oil or lubricant is added to the fuel.
4 stroke engine produces less pollution.

11. Disadvantages:
Four-stroke engines are heavier, weigh about 50%
more compare to two.
It creates higher torque at a lower rpm.
The system has more parts which could cause a
breakdown.
It's expensive and repairs cost more.

12. THANK YOU