How Does a 2-Stroke Diesel Engine Work Explain With Picture

How Does a 2-Stroke Diesel Engine Work

In this article, we describe how does a 2-stroke diesel engine works & some facts about a 2-stroke diesel engine & a comparison between petrol & diesel engines.


In the work of a 2-stroke diesel engine, all the work induction compression, power, and exhaust are completed in 2-stroke.

In other words we can speak, every second stroke is a power stroke.

The 2 stroke diesel engine only air is filled to the cylinder and when the piston rich TDC this air is compressed to the extent that its temperature rises quite high.

That time fuel diesel oil is injected in this burning hot air in find optimise from which gets ignited.

The burning of finely atomized fuel with hot air causes abnormal pressure on the piston as the piston is the only moving part in the cylinder it moves down due to pressure on top of it and we get power stroke.

While studying the working of the 2-Stroke Petrol engine we had seen that while the air-fuel mixture was being supplied to the cylinder from the Inlet port, This port is used to get escape through the exhaust port resulting in loss of fuel and loss of horsepower.

Whereas in a 2-stroke diesel engine it is only the air even if it escapes we do not lose much.

How Does a 2-Stroke Diesel Engine Work

Intake & Exhaust stroke

intake & exhaust stroke 2-Stroke Diesel Engine Work

In the 2-stroke diesel engine both port intake and exhaust, are made in the cylinder as shown in the image and the Piston use is also dome type.

When the Piston travels down the exhaust port gets and covered by the Piston.

When the Piston Travels a little more down in the inland port also get and covered by the Piston from where, the fresh air finds its way in the cylinder.

Compression stroke

compression stroke 2-Stroke Diesel Engine Work

An after completing this downward travel when the Piston starts traveling up from BDC to TDC It closes the inlet and exhaust port and the air which is trapped in the cylinder starts getting compress.

Due to the high compression ratio the temperature and pressure of air rise very high.

At soon as the Piston reaches near TDC diesel fuel is spray in a fine atomizer from to the highly compressed gases.

Power stroke

power stroke 2-Stroke Diesel Engine Work

A stated about due to the spring of atomizer diesel on highly compressed air there are spontaneous combustion gases expand rapidly causing pistons to travel from TDC to BDC giving us power stroke.

As soon as the Piston reaches near BDC the exhaust gases escape out through the exhaust port and covered by the Piston thereby relieving the Piston on top of just cause by expanded gases.

In the meantime, the inland port also opens causing air to come into the cylinder.

This air also helps in sweeping out the exhaust gases and thus, the cycle continues.

Some Fact’s About 2-Stroke Diesel Engine

  • 2-stroke engine work consume little more fuel.
  • Due to less number of parts two stroke engine are lighter in weight.
  • 2-stroke engine has the power stroke then 4-stroke engine and as such develop more horsepower.
  • For send more air in 2-stroke engine supercharger are used to that engine develop sufficient power.
  • A 2-stroke engine crankshaft has a uniform turning talk as every time the Piston comes from top to bottom it is a power stroke.

Compression Between Petrol & Diesel engines

Patrol engineDiesel engine
Engine cost is lessEngine cost is more
More fuel consumption Less fuel consumption
The engine is lighter in weight Engine is heavy
The engine requires regular maintenance
of ignition system
Fuel injection does not require that frequent maintenance
Fuel injection does not require that frequent
maintenance engine requires a change of spark plug after few thousand kilometers
No spark plug is fitted
Engine overhaul life is less The engine requires overhaul after a long time life of the engine is more
Spare required for overhaul are less costly Spare required for overhauling in the engine are costly
The engine is flexible due to higher governor speed Due to the lower governor speed engine is not that flexible
Due to lower engine torque, the transmission is not made heavy duty Due to higher engine torque transmission is made heavy duty
At ideal speed, the engine does not run effectively It runs Good even at the ideal speed
Engine starting is good even in cold weather Engine starting is difficult in cold weather and require heater plugs
The engine requires a small capacity battery as starting engine torque is less An engine requires a high capacity battery as engine starting torque is more
The costly machine is not required for adjusting to testing of carburetor or ignition systemProtesting calibrating or facing of injection pump costly machine are required
Engine Run with no vibration Engine Run with vibration
Due to less weight of the engine and smooth working vehicle chases is not made every strong Due to the heavyweight of the engine and more vibration in the engine is made extra strong
While running in which does not produce much soundThe engine produces more sound while running
The radiator used in the engine is light in weight The radiator used in this engine is heavy duty

Read this:- What is a 2-Stroke Petrol Engine & the Working of a 2-Stroke Petrol Engine?


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