The document presents a presentation on the working of a four-stroke diesel engine. It defines an engine as a prime mover that converts fuel into mechanical energy. It classifies engines based on their stroke, fuel used, cylinder position, and ignition type. It then describes the basic parts of a diesel engine, including the cylinder block, piston, connecting rod, crankshaft, cylinder head, valves, camshaft, and spark plug. It proceeds to explain the four strokes of the diesel engine cycle - intake, compression, power, and exhaust strokes. It concludes by noting advantages of diesel engines such as better fuel economy, lower fuel costs, and higher reliability compared to gasoline engines.

1. Presentation
on
Working of a four wheeler
(4 stroke diesel Engine)
In partial fulfillment of the subject
Elements of Mechanical Engineering
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2. Car Components.
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3. What is Engine?
• Engine is a Prime Mover which converts
Natural Source(fuel) in to mechanical energy.
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4. Basic classification of Engines.
On the Basis of…
• Stroke: Two-stroke/Four -stroke
• Fuel used: Diesel/Petrol
• Cylinder position: Horizontal/Vertical.
• Ignition of Fuel: Compression ignition/ Spark Ignition
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5. 5
Basic Parts of the Diesel Engine
• Cylinder block
• Piston
• Piston rings
• Piston pin
• Connecting rod
• Crankshaft
• Cylinder head
• Intake valve
• Exhaust valve
• Camshaft
• Timing gears
• Spark plug

6. 6
Piston
• A sliding plug that
harnesses the force of
the burning gases in
the cylinder.

7. 7
Connecting Rod
• Connects the piston
and piston pin to the
crankshaft.

8. 8
Crankshaft
• Along the the piston
pin and connecting
rod it converts the up
and down motion
(reciprocating) of the
engine to spinning
(rotary) motion.

9. 9
Intake and Exhaust Valves
• Doorway that lets the
gases in and out of the
engine.

10. 10
Four Stroke Cycle
• Intake
• Compression
• Power
• Exhaust

11. 11
Intake Stroke
• Intake valve opens.
• Piston moves down
TDC(Top Dead Center) to
BDC(Bottom Dead Center)
• A vacuum is created in the
cylinder.
• Atmospheric pressure
pushes the air into the
cylinder.

12. 12
Compression Stroke
• Both valves close.
• Piston moves from
BDC to TDC.
• Air is compressed.
• At the end fuel is
dropped by fuel
injector.

13. 13
Power Stroke
• Both valves remain
closed.
• Due to high
Temperature Fuel
combustion takes
place.
• Piston moves down
from TDC to BDC
• Heat is converted to
mechanical energy.

14. 14
Exhaust Stroke
• Exhaust valve opens.
• Piston move from BDC
to TDC.
• Exhaust gases are
pushed out polluting
the atmosphere.

15. 15
Diesel Animation

16. 16
Advantages
• Better fuel economy and longer engine life.
• For a fairly long time usage, the equation
works great in a big diesel tractor-trailer rig
that is running 400 miles every day, but it is
not nearly so beneficial in a passenger car.
• Lower Fuel cost compared to Gasoline
Engine.
• Diesels are more reliable. Because they
don’t need high-voltage ignition systems,
diesel engines never fail for lack of a spark.

17. Reference.
• www.howstuffworks.com
• en.wikipedia.org
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18. Thank You
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