2 Stroke Engine Working Video Download

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One of the first 'Yamaha Motor Co., Ltd.' Began to use on a 2-stroke outboard motors separate lubrication system, which was called 'Autolube'. More sophisticated technologies on 2-stroke engines began to be used in the 90s of the last century and made it possible to keep powerful models in the production program that meet the environmental. The most modern and high-tech outboard motors of this brand are two-stroke and four-stroke outboard engines. They are very powerful, reliable and safe. In addition, it is these outboard models that are considered to be very environmentally friendly. The power of such boat engines is from 2 to 270 horsepower. Two Stroke Engine Two stroke engine is first described by Du gal Clerk in 1878.In two stroke engine one cycle is completed in every revolution of crankshaft. Working principle of two Stroke Engine Two stroke engine is widely used employed where small power required for motor cycle like auto rickshaw, scooter. This videos illustrates the working of 4 stroke engine, with all the four strokes explained and also at the end, a real-time animation at 5000RPM.!!!

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4 STROKE VS 2 STROKE ENGINES

4 STROKE ENGINES

  • 4 stroke engine completes 2 rotations of crankshaft after completing one cycle.
  • Power is produced once every 4 strokes of the piston.
  • Engine design is a bit complicated due to valve mechanism which is operated through gear & chain mechanism.
  • No need of adding oil or lubricant to fuel.
  • Top side of the piston is flat.
  • Mixture remains only in the combustion chamber.
  • 4 stroke engines are heavier.
  • 4 stroke engines make less noise.

2 STROKE ENGINES

2 Stroke Engine Working Video Download
  • 2 stroke engine completes 1 rotation of crankshaft after completing one cycle.
  • Power is produced once during 2 strokes of the piston.
  • 2 stroke engine has ports which makes it’s design simpler.
  • Addition of oil is required.
  • A bump or protuberance may be needed on top side of piston.
  • Air-fuel mixture enters through inlet port & travels to combustion chamber passing through crankcase.
  • 2 stroke engines are lighter comparatively.
  • 2 stroke engines are louder comparatively.

Read more : Advantages And Disadvantages Of Two-Stroke Engine Over Four-Stroke Engine

ADVANTAGE AND DISADVANTAGES

4 STROKE ENGINE :-

ADVANTAGES

1. More torque :- In general, 4 stroke engines always make extra torque than 2 stroke engine at low RPM. Although 2 stroked ones give higher torque at higher RPM but it has a lot to do with fuel efficiency.

2. More fuel efficiency :-4 stroke engines have greater fuel efficiency than 2 stroke ones because fuel is consumed once every 4 strokes.

3. Less pollution :- As power is generated once every 4 strokes & also as no oil or lubricant is added to the fuel; 4 stroke engine produces less pollution

4. More durability :-We all know that more the engine runs, quicker it wears out. 2 stroke engines are designed for high RPM. If an engine can go for 10000 rpm’s before it wears out; a 4 stroke engine with 100 rpm will run for 100 minutes than the other 2 stroke engine which has a higher rpm of 500 & will run for only 20 minutes.

5. No extra addition of oil :-Only the moving parts need lubrication intermediately. No extra oil or lubricant is added to fuel.

DISADVANTAGES

1. Complicated design :- A 4 stroke engine has complex valve mechanisms operated & controlled by gears & chain. Also there are many parts to worry about which makes it harder to troubleshoot.

2. Less powerful :-As power gets delivered once every 2 rotations of crankshaft(4 strokes), hence 4 stroke is less powerful.

3. Expensive :- A four stroke engine has much more parts than 2 stroke engine. So they often require repairs which leads to greater expense.

2 STROKE ENGINE :-

ADVANTAGES

1. Simple design & construction :- It doesn’t have valves. It simply has inlet & outlet ports which makes it simpler.

2 Stroke Engine Working Video Download

2. More powerful :- In 2 stroke engine, every alternate stroke is power stroke unlike 4 stroked one in which power gets delivered once every 4 strokes. This gives a significant power boost. Also, the acceleration will be higher & power delivery will be uniform due to same reason.

3. Position doesn’t matter :- 2 stroke engine can work in any position as lubrication is done through the means of fuel (as the fuel passes by through whole cylinder & crankcase).

DISADVANTAGES

1. Less fuel efficiency :– For every alternate power stroke, fuel gets consumed every alternate stroke. This makes the engine less fuel efficient although it results in uniform power delivery.

2. Oil addition could be expensive :– Two-stroke engines require a mix of oil in with the air-fuel mixture to lubricate the crankshaft, connecting rod and cylinder walls. These oils may empty your pockets.

3. More pollution :- 2 stroke engine produces a lot of pollution. The combustion of oil added in the mixture creates a lot of smoke which leads to air pollution.

4. Wastage of fuel :– Sometimes the fresh charge which is going to undergo combustion gets out along with the exhaust gases. This leads to wastage of fuel & also power delivery of the engine gets effected.

5. Improper combustion :- The exhaust gases often get trapped inside the combustion chamber. This makes the fresh charge impure. Therefore maximum power doesn’t get delivered because of improper incomplete combustion.

Related posts:

A four-stroke engine is an Internal combustion engine, where four successive strokes (i.e. Suction-Compression-Power-Exhaust) completes in two revolutions of the crankshaft. Therefore, the engine is called a Four-stroke engine.

In recent days the majority of automobile runs on a four-stroke cycle.
Basic some terms used in this article:

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Top dead center (TDC):

It is the extreme position of the piston at the head end of the cylinder.

At TDC the crank angle is 0*

Bottom dead center (BDC):

The extreme position of the piston at the crank end side.

2 Stroke Engine Working Video Download

At BDC, the crank angle is a 180*

Cylinder bore:

It is the internal diameter of the cylinder.

Stroke:

It is the distance through which the piston moves in the cylinder during 1 stroke.

NOTE: * = Degree

Four-Stroke engine’s parts:

A Four-stroke engine consist of the following parts:

  1. Cylinder: It is the heart of the engine. The piston reciprocates in the cylinder.
  2. Cylinder head: It is the top cover of the cylinder, towards TDC, which is called the cylinder head.
  3. Piston: It is the reciprocating member of the engine. It reciprocates in the cylinder.
  4. Piston rings: Two or three piston rings are provided on the piston. It seals the gap between the cylinder liner and piston.
  5. Crank: It is a rotating member. It makes a circular motion inside the crankcase.
  6. Crankcase: It is the housing of crank and other engine parts. It is also used as the sump of lubricating oil.
  7. Connecting rod: It is used to convert the reciprocating motion of the piston to rotary motion of the crankshaft.
  8. Crankshaft: It is the rotating member, which connects the crank.
  9. Cooling fins or Water jackets: It is used for cooling purposes.
  10. Cam and Camshaft: It is provided to operate the opening and closing of the Inlet and Exhaust valve and also operate the fuel injection pump in the Diesel engine.
  11. Inlet valve: This valve controlled the admission of charge or air inside the engine cylinder.
  12. Exhaust valve: This valve controls the removal of burnt gas after combustion.
  13. Intake manifold: This is a passage that carries the fresh charge or air.
  14. Exhaust manifold: This a passage through which the exhaust gas goes out of the engine cylinder.
  15. Spark plug: It is used in a Petrol engine or SI engine to ignite the fuel.
  16. Fuel injector: It is used in a Diesel engine or CI engine to sprayed the fuel inside the engine cylinder.
  17. Carburetor: It is used in a Petrol engine to mix the air-fuel properly.
  18. Flywheel: It is mounted on the crankshaft and is made of cast iron. It stores energy in the form of inertia.

Classification of 4-stroke engine:

The four-stroke engine generally classified in 2 types:

  1. The four-stroke cycle petrol engine
  2. Four-stroke cycle diesel engine

Four-stroke Petrol engine:

This type of engine based on the Otto cycle. The various strokes in the operation of a four-stroke cycle petrol engine are described below.

Construction:

A four-stroke petrol engine consists of:

  1. A cylinder
  2. Cylinder head attaches with spark plug
  3. Piston attach with piston ring
  4. Connecting rod
  5. Crank
  6. Crankshaft
  7. Valves ETC.

In four-stroke engines, Valves are used instead of Ports.

There are two valves:

  1. Suction valve
  2. Exhaust valve

And these valves are operated by means of Camshaft. It is rotated at half the speed of a crankshaft.

The working principle of the Four-stroke petrol engine:

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The travel of the piston from one dead center to another is called piston stroke and a four-stroke cycle consists of four strokes:

  1. Suction Stroke
  2. Compression Stroke
  3. Power or Expansion Stroke
  4. Exhaust Stroke

Let me introduce these:

  • Suction stroke:

In this stroke the suction valve opens, exhaust valves remain in close condition. The piston moves from the top dead center to the bottom dead center and the charge (Air+Fuel) enters the engine cylinder due to the partial vacuum developed inside the cylinder.

When the piston reaches the BDC, the inlet valve closes and the flywheel makes a half revolution.

  • Compression Stroke:

In this stroke, the piston moves from the bottom dead center (BDC) to the top dead center (TDC), and both the suction and exhaust valves are in closed condition. The mixture, which was sucked into the cylinder during the suction stroke, is compressed into the combustion chamber. The heat produced during the compression stroke and vaporize the mixture. As the piston approaches the top dead center, the compression stroke completes, and then the spark plug gives the spark.

  • Power Stroke or Expansion stroke:

Again both the inlet and exhaust valves are closed in this stroke. The compressed charge ignited by the high intensity of the spark and expands adiabatically, therefore, it pushes the piston downward i.e. towards BDC then the stroke is completed.

  • Exhaust Stroke:

During the exhaust stroke, the inlet valve is in a closed condition and the exhaust valve is opened. The piston rises up from BDC to TDC. The stroke is completed when the piston reaches the Top Dead Center. And then again stokes are recycled.

In the exhaust stroke in one situation both the valves are in an open condition for some seconds so that fresh charge entered to engine cylinder and pushes the burnt gases out of the cylinder. This process is called Scavenging.

This is how a Four-stroke Petrol engine works.

Four-stroke Petrol engine diagram:

Valve-timing diagram for four-stroke Petrol engine:

Theoretical:

  • The Inlet valve opens when the piston at TDC
  • The Inlet valve closes when the piston reaches BDC
  • Spark produces when the piston reaches TDC
  • The exhaust valve opens when the piston at BDC
  • Exhaust valve close when the piston at TDC

Actual valve-timing diagram:

  • The Inlet valve opens about 10*-20* before TDC
  • Inlet valve close 30*-40* after BDC to take advantage of rapidly moving gas
  • The spark occurs 20*-35* before TDC
  • The exhaust valve opens about 30*-50* before BDC
  • Exhaust valve close about 10*-15* after TDC

Applications of Four-stroke Petrol engine:

It has various types of usages like:

  1. In automobiles
  2. Motorcycles
  3. Cars
  4. Buses
  5. Trucks
  6. Airplanes
  7. Small pumping sets
  8. Mobile electric generator

Four-stroke Diesel engine:

Construction:

A four-stroke Diesel engine consists of:

  1. A fuel injector
  2. Fuel pump
  3. Cylinder
  4. Cylinder head
  5. Inlet and exhaust valves
  6. Piston
  7. Piston ring
  8. Connecting rod
  9. Camshaft
  10. Crankshaft
  11. Cam ETC.

Working principle of Four-stroke Diesel engine:

The cycles of the Four-stroke diesel engine are the same as the Petrol engine.

  1. Suction Stroke
  2. Compression Stroke
  3. Power or Expansion Stroke
  4. Exhaust Stroke
  • Suction Stroke:

In a suction stroke, the inlet valve is in the opened condition and the exhaust valve remains closed. The atmospheric air is drawn into the cylinder as the piston moves from TDC to the BDC due to the partial vacuum air is sucked inside the cylinder.

  • Compression Stroke:

In this stroke Piston moves from BDC to TDC, as a result, the air inside the cylinder is compressed and heated.

In this stroke both the valves are in closed condition.

The air temperature is around 800*C

At the end of the compression stroke, the fuel injector inject the fuel at high pressure into the compressed hot air, thus the ignition takes place inside the cylinder.

  • Power or Expansion Stroke:

During this stroke, both the valves are in closed condition. The piston at the TDC is pushed downward by the expansion of burned gas.

Therefore a Power stroke is produced.

  • Exhaust stroke:

In this stroke, the exhaust valve is opened and the inlet valve is in the closed condition. The piston travels from BDC to TDC and pushed the burned gas out of the cylinder.

And here is also the scavenging process that happened to remove the burnt gas completely.

Valve-timing diagram for four-stroke Diesel engine:

Actual valve-timing diagram:

  • Inlet valve open at 10*-30* before TDC
  • The Inlet valve closes at 20*-50* after BDC
  • The exhaust valve opens approximately 40* before BDC
  • Exhaust valve close 15* after TDC
  • Fuel injection starts 5*-15* before TDC
  • Fuel injection stops 15*-25* after TDC

Applications of Four-stroke Diesel engine:

The four-stroke Diesel engine is one of the most popular prime overs. It has various types of applications like:

  1. Small pumping sets
  2. In the automobile industry
  3. Air compressor
  4. Drilling jigs
  5. Boats and Ships
  6. Power saw
  7. Bulldozers
  8. Tanks
  9. Diesel-electric locomotives ETC.

2-Stroke engine vs 4-Stroke engine

Petrol Engine (SI) vs Diesel Engine (CI)

Advantages and Disadvantages of Four-Stroke engine:

Advantages of 4-Stroke engine:

  1. More torque
  2. More fuel economy than a 2-stroke engine
  3. Less consumption of lubrication oil
  4. Less pollution because of proper burning of fuel
  5. More durability
  6. Well managed cooling system, so that longer engine life
  7. Less noisy
  8. Scavenging happens really well, therefore Thermal efficiency and HP of the engine is high

Let’s talk about some disadvantages:

  1. There are many moving parts and hence there is more friction, therefore the engine has less mechanical efficiency.
  2. The design is complicated
  3. The weight of the engine is more because of heavier flywheel construction.
  4. Due to more parts, the maintenance required quite often.

Fuel supply system in Four-stroke engine:

The petrol engine fuel supply system consists of:

  • Fuel feed system
  1. Gravity system
  2. Vacuum system
  3. Pressure system
  4. Pump system
  5. Fuel injection system
  • Fuel tank
  • Fuel lines
  • Fuel filter

At first, an electrical petrol pump or mechanical petrol pump sucked the fuel from the fuel tank via a fuel filter as shown in figure then the fuel through the fuel lines goes to the carburetor where air+fuel mixed with proper ratio and enters into the engine cylinder for combustion.

To know more, checkout the Fuel supply system in petrol engines

Diesel engines fuel supply system consists of:

  1. A Diesel tank
  2. A feed pump
  3. A filter
  4. An injection pump
  5. An injector
  6. Connecting lines

There are two types of the fuel injection system in a Diesel engine:

  1. Air injection system or Indirect injection
  2. Solid injection system or Direct injection

And there are two types of solid injection system:

  1. Common rail fuel injection system
  2. Individual pump fuel injection system.

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The lubrication system in Four-stroke engine:

The supply of lubricating oil between two moving parts of the vehicle is called lubrication.

Why we need a lubrication system?

The primary objectives of lubrication are:

  1. To reduce friction between moving parts to its minimum so that power loss is less
  2. To reduce wearing out of moving parts
  3. To provide a cooling effect
  4. To provide the cleaning action

4-stroke engine lubrication system consists of:

  1. Oil pump
  2. Oil cooler
  3. Oil strainer
  4. Oil filter
  5. Oil pressure gauge
  6. Crankcase dilution

Parts to be lubricated:

The following parts in the engine require lubrication.

  1. Crankshaft bearings
  2. Crankpins
  3. The big end of connecting rod bearing
  4. The small end of the connecting rod bearing
  5. Bushes of gudgeon pin or Wrist pin
  6. The inner wall of the cylinder
  7. Valve operating mechanism
  8. Timing gears
  9. Camshaft bearing

The lubrication system in engines:

  1. Petrol system
  2. Splash system
  3. Pressure system
  4. Dry-sump system
  5. Combined splash and pressure-feed system

More on the Lubrication System.

The cooling system in the Four-Stroke engine:

All the heat produced by the combustion of fuel is not totally converted into power at the crankshaft.

Only about 20 percent of the heat is used as power at the crankshaft. And 35 percent of the heat is transferred to the cylinder wall which cause pre-ignition of the charge and also lubricant burned away due to the heat, therefore the engine maybe seized.

Keeping above factor in mind we need to install a proper cooling system.

In a Four-stroke engine their are two types cooling method.

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  1. Cooling by air
  2. Cooling by water

More on Engine Cooling System.

Some FAQ:
What is Scavenging?

Two Stroke Engine Video Download

In the exhaust stroke in one situation both the valves are in opened condition for some seconds so that fresh charge entered to engine cylinder and pushes the burnt gases out of the cylinder. This process is called Scavenging.

What is the Four-Stroke Engine?

A four-stroke engine is an Internal combustion engine, where four successive strokes (i.e. Suction-Compression-Power-Exhaust) completes in two revolutions of the crankshaft. Therefore, the engine is called a Four-stroke engine.

What are the Parts of Four-stroke Engine?

A four-stroke petrol engine consists of:
1. A cylinder
2
. Cylinder head attaches with spark plug
3. Piston attach with piston ring
4. Connecting rod
5. Crank
6. Crankshaft
7. Valves ETC.

2 Stroke Engine Working Video Download Youtube

So this is the complete overview on Four Stroke Engine, I hope I am able to explain it well, for further more doubts do let me know in the comment section. And below is your PDF downloadable link.

P.S.: I reply every comment posted here!

2 Stroke Engine Working Video Download Free

You may have interest to read about 2-Stroke Engine also.

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