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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. ...

TYPES OF DERIVES UNIT-1

Derives may be classified into following two ways:- 

A.) ACCORDING TO PLACEMENT OF STEERING:-  two types

1.) Right Hand Drive - in this , the steering wheel is fitted towards the right side of vehicle. 
Example:- This type of derive is only  found in foreign countries.

2.) Left Hand Drive - in this , the steering wheel is fitted towards the left side of vehicle.
Example:- This system used in India.

B.) ACCORDING TO DRIVING WHEELS :- 4 

1.) Front wheel Drive - In this system, the power of the engine is transmitted to front axle which drives front wheel.

Advantage 
•  No need propeller shaft.
•  simplified linkage are required for clutch and gear box.
•  The vehicle is safe against skidding.

Disadvantages
• Mechanism is kind of  complicated. because front wheel also steer the vehicle.
•  It is preferable while going uphill.
• The steering is heavy because all the load is at the front.

2.) Rear wheel Drive - in this system, the power of the engine is transmitted to rear axle with help of propeller shaft which Drives rear wheel.

Advantages
• it is stable while going uphill.
• steering is easy Because the load at the rear end.

Disadvantages
• Because of propeller shaft and universal joints the vehicle becomes heavy and costly.
• The efficiency of vehicles is decreased because of propeller shaft arrangements is used.

3.) Four wheel Drive - in this system, the power is transmitted to all the four wheel.
Examples:- Thar 

Advantages
• It is very useful on rough surface and in deserts.
• It is also useful in sports and military vehicles.

Disadvantages
• Vehicle is heavy
• Running cost is high
• Initial cost is high

4.) 6x4 Wheel Drive - it is used for driving heavy transport vehicles which have four wheel on the rear axle.
Examples :- Buses , Trucks

Advantages
• High stability
• safe against skidding
Disadvantages
• Low efficiency 
• Vehicle is to heavy 




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DIFFERENCE BETWEEN S.I AND C.I ENGINES

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