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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. ...

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.
Maintenance Cost Maintenance cost is higher. Maintenance cost is lower.
Ignition System Requires a spark plug for ignition. Has self-ignition due to high compression.
Common Uses Used in motorcycles, cars, scooters, etc. Used in trucks, buses, tractors, etc.
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