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DIFFERENCE BETWEEN S.I AND C.I ENGINES

Criteria S.I. Engine (Petrol or Spark Ignition Engine) C.I. Engine (Diesel or Compression Ignition Engine) Working Cycle Works on Otto Cycle or Constant Volume Cycle. Works on Diesel Cycle. Mixture During Suction Stroke Takes a mixture of air and petrol during the suction stroke. Takes only air during the suction stroke. Fuel Used Uses petrol as fuel. Uses diesel as fuel. Compression Ratio Has a compression ratio that varies from 6 to 10. Has a compression ratio that varies from 16 to 20. Engine Weight and Cost S.I. engines are lighter and cheaper. C.I. engines are heavier and costlier. Initial Cost Initial cost is lower compared to C.I. engines. Initial cost is high due to high compression ratio. Starting Starting is easy. Starting is difficult, especially in cold conditions. ...

Automobile Introduction UNIT-1

AUTOMOBILE - It is a self- propelled vehicle which is used for the transportation.

# PARTS/ COMPONENTS OF AN AUTOMOBILE- There are two major parts of vehicles.
1.) Body
2.) Chassis
1.) BODY - It is the part of an automobile where passanger can sit or where the cargo can be placed.
#.)Cargo- it the load of materials which transported by vehicle.
Example:- ( truck body, car body etc.)

2.) CHASSIS - it is the portion of vehicles without body is called chassi.
Or 
The bottom part of vehicles in which engine is fitted with power transmission unit is called chassi.

Examples :- a.)power transmission system
                      b.) Suspension system
                      c.) Axles
                      d.) Braking system
                      e.) Steering system
                      f.) Rim and tyres etc.

#.) History of an automobiles :- 
The first generation automobile were powered by gasoline fuelled engines.They were called gas bussies.

In 1880, IC engine vehicle was developed by German and French engg.

The next automobile was built by Benz Carl in 1885 and it was a tricycle having IC engine.
In 1885- 1886, Diamler was a another German built a 4 wheel buggy.

In 1895 two brothers of USA Charles and Frank put forward step in automobile.

In 1908 Ford put the whole of America in wheels and it was T- FORD and first assembly production of the automobile was achieved by Henry Ford Company.

In 1920, gradual change in the design and construction in automobile is started.










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