1. AGNIHOTRI college of engineering,
A PPT PRESANTATION ON “FOUR STROKE PEROL ENGINE”
AGNIHOTRI college of engineering,
WARDHA
Under the Guidance of
PROF. RAKHI DOLAS
Presented By
SHUBHAM A. WASNIK
2013/10/09

2. ENGINE
An engine is motor which converts chemical energy into mechanical energy.
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3. Otto Cycle: Dr. Nicolaus Otto - 1876
HISTORY
Otto Cycle: Dr. Nicolaus Otto
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4. HISTORY
One of the most important landmark in engine design by Nicolas August Otto in 1876 who is invented as effective four stroke engine. That’s why it is also called as “Otto cycle engine”.
In 1885 German mechanical engineer, Karl Benz designed and built the world’s first practical automobile to be powered by an internal-combustion engine, on January 29, 1886.
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5. The Basics A four-stroke engine: Is an internal combustion engine
Converts gasoline into motion
Is the most common car engine type
Is relatively efficient
Is relatively inexpensive

6. How work a Four Stroke Engine Following are the four stroke:
1-Intake/Suction Stroke
2-Copression Stroke
3-Expansion Stroke
4-Exhaust Stroke
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7. Four stroke cycle Intake stroke Piston moving down Intake valve open
Exhaust valve closed
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8. Four stroke cycle Compression stroke Piston moving up
Intake valve closed
Exhaust valve closed
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9. Four stroke cycle Power stroke Piston moving down Intake valve closed
Exhaust valve closed
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10. Four stroke cycle Exhaust stroke Piston moving up Intake valve closed
Exhaust valve open
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11. Four stroke cycle
(Petrol)
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12. Piston Dwell Time Piston travel is at a minimum TDC and BDC
Crank moves horizontally
Piston velocity
Maximum when rod is 90° to crank
Acceleration
Maximum 30° earlier
Best VE is obtained by synchronizing valve opening with piston speeds
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13. Other Valve Position Overlap Both valves are open
End of exhaust & start of intake
Low pressure in exhaust port
Blow down
Exhaust valve opens before BDC
To help evacuate cylinder before piston reverses
Pumping losses at end of exhaust stroke
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14. Petrol Engine Advantages More torque even at idling speed
No Scavenging problems
No fresh mixture escaping with exhaust gases.
Disadvantages
Low power to weight ratio
More moving parts, not suitable for high speed
More number of stroke per circle
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15. CONCLUSION
Weight represents the greatest nemesis of any shallow-water skiff. However if fuel priced continue trading up instead of down, then yes absolutely. Four-stroke power will always be heavier than its two-stroke counterpart unless someone makes an amazing breakthrough in metallurgy and the laws of physics. The four stoke petrol engine powers virtually every petrol engine in the world.
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16. Inspect and service Engine Georgia Institute of Technology
REFERECES
Inspect and service Engine
Georgia Institute of Technology
George W. Woodruff School of Technology
2009/10/05
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17. 2015/03/01