The Diesel engine

The Diesel engine

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.

By |2017-01-17T11:13:07+00:00May 20th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|Comments Off on The Diesel engine

About the Author:

He holds an Honours in Accountancy degree from the University of Zimbabwe. He is passionate about technology and its practical application in today's world.
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