This presentation describes the 4 stroke diesel engine.

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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