Diesel Engine
1. It has got no carburetor, ignition coil and spark plug.
2. Its compression ratio varies from 14:1 to 22:1
3. It uses diesel oil as fuel.
4. Only air is sucked in cylinder in suction stroke.
5. It has got ‘fuel injection pump’ and injector
6. Fuel is injected in combustion chamber where burning of fuel takes places due to heat of compression.
7. Thermal efficiency varies from 32 to 38%
8. Engine weight per horse-power is high.
9. Operating cost is low.
10. Compression pressure inside the cylinder varies from 35 to 45 kg/cm2 and temperature is about 500°C.
Petrol Engine
1.It has got carburetor, ignition coil & spark plug.
2. Its compression ratio varies from 5:1 to 8:1.
3. It uses petrol (gasoline) or power kerosine as fuel.
6. It has got no fuel injection pump and injector, instead it has got carburetor and ignition coil.
5. Air fuel mixture is compressed in the combustion chamber when it is ignited by an electric spark.
6. Thermal efficiency varies from 25 to 32%.
7. Engine weight per horsepower is comparatively low.
8. Operating cost is high.
9. Mixture of fuel and air is sucked in the cylinder in suction stroke.
10. Compression pressure varies from 6 to 10 kg/cm2 and temperature is above 260°C.
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