ZIMSEC O Level Combined Science Notes: The Diesel engine
- Operates in almost the same way as the Petrol Engine apart from certain differences:
- They use diesel instead of Petrol
- Have no spark plugs
- Have a fuel injector instead of a carburettor
- Diesel engines are also known as compression-ignition engines
- They are heavier than Petrol engines because they have to withstand the pressure
How they work?
- Air is drawn into the cylinder during the down-stroke movement of the piston
- Air is compressed when the piston moves up
- The compression of diesel engines is about twice as strong as that of Petrol engines
- The compressed air becomes very hot due to this compression
- Fuel is now pumped into the cylinder by the fuel injector
- Because of the high temperature of the compressed air in the cylinder
- the fuel ignites
- The resultant explosion pushes the piston down on its power stroke
- Diesel engines are bulkier than Petrol engines so as to be able to withstand the extra pressure
- They are however more efficient than Petrol Engines
To access more topics go to the Combined Science Notes page.
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