Honda Diesel Engine. Image credit forum.cardekho.com

Honda Diesel Engine. Image credit forum.cardekho.com

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?

The diesel engine. Image credit blogspot.com

The diesel engine. Image credit blogspot.com

  • 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 ┬áignites
  • 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.


Quick NetOne, Telecel, Africom, And Econet Airtime Recharge

If anything goes wrong, click here to enter your query.