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Whats the different between gas engine, petrol engine and diesel ????

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Question added by khalaf ahmed omar , Service Manager , company
Date Posted: 2016/04/08
SHEIKH ALFAT
by SHEIKH ALFAT , JE. ENGINEER , AIR DUCT SYSTEM

No needs of spark plug in gas n diesel engine.. most efficient pollutant is diesel engine.. cetane number only in diesel engine and octane number is in petrol engine which i know..thats it.

rehan rehan
by rehan rehan , service engineer , Airmech Oman

nature of burning fuel mixture..

Nisar  Ahmed
by Nisar Ahmed , Mechanical maintenance supervisor , South Asia Pakistan Terminals

THE DIESEL ENGINE WAS INVENTED BY RUDOLF DIESEL WHILE ATTENDING ENGINEERING SCHOOL IN GERMANY. RUDOLF WAS SURPRISED HOW INEFFICIENT GASOLINE AND STEAM ENGINES WERE. THE DESIGN OF THE DIESEL ENGINE WAS PATENTED IN 1892.

Both diesel and gasoline engines convert chemical energy from fuel into mechanical energy through a series of explosions. The way these explosions happen is the major difference between these two engines.

 

In a gasoline engine, the explosion process is:

1. Intake stroke – fuel is mixed with air

2. Compression stroke – piston goes up, mixture of fuel and air is compressed

3. Ignition stroke – fuel/air is ignited through the use of a spark plug

4. Exhaust stroke – piston goes up, pushes exhaust through the exhaust valve

In a diesel engine, the explosion process is:

1. Intake stroke – intake valve opens, air in, piston goes down

2. Compression stroke – piston goes up, air compressed (heated in excess of 540°C)

3. Combustion stroke – fuel is injected (right time), ignition, piston goes down

4. Exhaust – piston goes up, pushes exhaust through the exhaust valve

 

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