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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. ...

EXPLAIN CONSTRUCTION AND WORKING OF SLIDING MESH GEAR BOX

EXPLAIN CONSTRUCTION AND WORKING OF SLIDING MESH GEAR BOX

• CONSTRUCTION - In this the clutch gear which mounted on the clutch shaft. This gear box shaft is attached to the Clutch.
The clutch gear A meshed with lay shaft gear D .
Lay shaft is a intermediate shaft.
There are 3 gear on lay shaft E,F and G. There is also an idle shaft on which a small idle gear H is mounted. This idle gear used for reversing the direction of vehicles.
There is a main shaft which is aligned to the Clutch shaft. The two gear B & C mounted on main shaft in such a way they can slide on main - shaft.
SPLINED SHAFT IS ALSO CALLED Min shaft.
• WORKING - The gear A is always rotating when clutch is engaged. The gear D, E ,F ,G and H is also rotate with gear A. Because gear D is always meshed with A. But gear B and C is not meshed with any gear. When drivers need high and low speed the gear B and C is used.

FIRST GEAR - In this , the main shaft is slides on which gear  B ,C is mounted. The gear C slides and it  is meshed with gear F. Because of this Gear C and Gear F conection the main shaft is rotating.
The power is transmitted from clutch shaft through A,D,F and C to main shaft.

SECOND GEAR - The main shaft slides again and this time gear B is meshed with Gear E. This time power is transmitted through A,D,E and B to main shaft.

HIGH OR TOP GEAR - For high gear , the gear B is slides on main shaft in such a way that's it is directly engaged to gear A through splines. It mean the clutch shaft is connected to main shaft. 
It means the all power from clutch shaft is transfer to main shaft thats why is called high gear.
REVERSE GEAR - The gear C is slides on main shaft and it is meshed with idle gear H. It reverse the direction of rotation. 
The power is transmitted from clutch shaft through Gear A,D,G,H and C to main shaft.


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