Tuesday, September 29, 2020
Home MECHANICAL DIFFERENCE BETWEEN PETROL(S.I) AND DIESEL(C.I) ENGINE

DIFFERENCE BETWEEN PETROL(S.I) AND DIESEL(C.I) ENGINE

PETROL (SPARK IGNITION) ENGINEDIESEL (COMPRESSION IGNITION) ENGINE
Petrol engine works on Otto cycle.Diesel engine works on Diesel cycle.
In petrol engine, a mixture of petrol and air is admitted into the cylinder during suction stroke with the help of carburetor.Diesel is injected directly into combustion chamber at high pressure at the end of compression stroke.
Carburetor is eliminated but high
pressure fuel pump and injector is
required.
Throttle valve in carburetor controls the quantity of mixture introduced in combustion chamber.Quantity of fuel is regulated by fuel pump.
Petrol engine requires an ignition
system with spark plug in combustion chamber.
No spark plug is combustion of fuel is spontaneous due to very high pressure and temperature
in combustion chamber.
Compression ratio is about 6 to 10.5.Compression ratio is about 14 to 22.
Higher r.p.m. due to lighter weight.Maximum r.p.m. is lower.
Maximum efficiency is lower (about
30 %) due to low compression ratio.
Higher efficiency (about 40 %) due to higher compression ratio.
Engine can be easily startÄ—d due to low compression ratio.Engine cannot be started easily due to high compression ratio.
Petrol engine is lighter in weight.Diesel engine is heavier due to higher pressure.
Petrol engines are generally employed in light duty vehicles like scooters, cars etc.Diesel engines are generally employed in heavy vehicles like bus, truck etc.
diesel angine and petrol engine

APPLICATION OF IC ENGINE

Four stroke petrol engine :
These engines are generally used in light vehicles such as passenger cars, scooters etc.
Two stroke petrol engine :
These engines are generally used in light vehicles such as scooters, motor cycles as it is light and compact.
Four stroke diesel engine :
These engines are generally used in heavy duty vehicles such as buses, trucks, tractors, pumping sets, diesel locomotives and in I.C. engine power plants etc.
Two stroke diesel engine :
These engines are generally employed in marine propulsion.

DANISHhttp://engineerschoice.in
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