powerpoint presentation of 4 stroke engine

Four-Stroke Engine Basics

Objectives:

• After the completion of this power point , the student will understand:
• What a four-stroke engine is,
• Other engine types,
• Basic components of a four-stroke engine,
• The four-stroke cycle.
• A four-stroke engine:
• Is an internal combustion engine,
• Converts gasoline into motion,
• Is the most common car engine type,
• Is relatively efficient,
• Is relatively inexpensive .

Other Engine Types

• Two-stroke engines
• Diesel engines
• Rotary engines
• Turbine engines
• Steam engines

Basic Components of Four-Stroke Engines

Intake Valve

Valve Cover

Intake Port

Engine Block

Exhaust Valve

Exhaust Port

Connecting Rod

Rod Bearings

Next Diagram

A. Intake Valve

• O pens at the proper time to let in air and fuel. Larger than the exhaust valve.

B. Valve cover

• Protects the valves and the valve springs. Keeps dirt out and lubricating oil in.

C. Intake Port

• T he passageway in a cylinder head for the fuel and air to pass through.
• A platform containing most of the parts of the combustion chamber.
• C irculating water and antifreeze to keep the temperature regulated.

F. Engine Block

• C ast in one piece. The basis for most of the parts of the engine.
• W here the oil is collected and recirculated.

H. Oil Sump

• T he collected oil primarily for lubricating the crankshaft and rod bearing

I. Camshaft

• A round shaft with lobes, that rotates to open and close the fuel and exhaust valves.

J. Exhaust Valve

• O pens at the proper time to release the exhaust.

K. Spark Plug

• A device inserted into the combustion chamber for firing an electrical spark to ignite air-fuel mixture

L. Exhaust Port

• T he passageway in a cylinder head for the exhaust to pass through
• T he part of the engine that moves up and down in the cylinder converting the gasoline into motion

N. Connecting Rod

• L inks the piston to the crankshaft.

O. Rod Bearing

• U sed to reduce friction to the rod and crankshaft

P. Crankshaft

• C onverts the up and down motion of the piston into a turning, or rotating motion

The 4-Stroke Cycle

Compression

The Intake Stroke

• The p rocess of filling the cylinder with the proper air-fuel mixture through the intake valve.

The Compression Stroke

• Compression - T he process of compressing the air-fuel mixture in the cylinder to make it more combustible.

The Combustion Stroke

• Combustion -the process of igniting the compressed air-fuel mixture to create motion and the overall power of the engine.
• Also known as the power stroke.

The Exhaust Stroke

• T he process of releasing the exhaust out of the cylinder through the exhaust valve.
• Prepares chamber for the next charge.

Application

• Now that you understand the basics of four-stroke engines, how can you use this information in the real world?
• Lets take a quiz to see what you have learned!

Question #1

The ____ controls the amount of intake and the release of exhaust.

d. connecting rod

Question #2

The _____ Cycle is the ignition of the compressed fuel-air mixture.

b. Combustion

d. Compress ion

Question #3

The most common type of engine?

a. diesel engines

b. 2-stroke engines

c. r otary engines

d. 4-stroke engines

Question #4

What part of the engine converts up and down motion into a rotation motion?

a. crankshaft

c. valve cover

d. camshaft

Question #5

What is the name of the part listed?

a. intake valve

d. spark plug

• Sorry, that answer is incorrect. Try again.
• That is correct! Lets try the next one.
• That answer is correct!

Congratulations!

• That is the end of your quiz, and the end of your lesson on four-stroke engines.
• www.howstuffworks.com/
• � Roth, Alfred C. Small Gas Enginges:

Funamental, Service, Troubleshooting, Repair, and Application . 10th. Tinely Park, Illinois: Goodheart-Willcox Company, Inc., 2012. Print.

Back To Beginning

• Preferences

2 stroke & 4 stroke engine - PowerPoint PPT Presentation

2 stroke & 4 stroke engine

Read student read about ic engine. – powerpoint ppt presentation.

• PRESENTED BY-
• BINAY PRASAD SONI MER072
• AMULYA KUMAR PANDA MER073
• DEBASIS BISOY MER074
• RAJAN KUMAR GUPTA MER075
• Reciprocating motion, used in reciprocating engines and other mechanisms, is back-and-forth motion. Each cycle of reciprocation consists of two opposite motions there is a motion in one direction, and then a motion back in the opposite direction. Each of these is called a stroke.
• A two-stroke petrol engine is an internal combustion engine that completes the process cycle in one revolution of the crankshaft. Thus, one power stroke is obtained in each revolution of the crank shaft.
• A four stroke diesel engine is an internal combustion engine that completes the process cycle in two revolution of the crank shaft. Thus, one power stroke is obtained in each two revolutions of the crank shaft.
• Cylinder block
• Piston rings
• Connecting rod
• Electric match used to begin the combustion process of burning air and petrol to create heat.
• It provides the means of ignition when the petrol engines piston is at the end of compression stroke, close to Top Dead Center(TDC)
• Connects the piston and piston pin to the crankshaft.
• A sliding plug that harnesses the force of the burning gases in the cylinder.
• Along the the piston pin and connecting rod it converts the up and down motion (reciprocating) of the engine to spinning (rotary) motion.
• 1.Here suction and exhaust strokes are eliminated. Instead of valves, ports are used.
• 2.The exhaust gases are driven out of the cylinder by the fresh charge entering the cylinder.
• 3. The intake exhaust are controlled by movement of piston.
•  4. The fresh charge enter to cylinder due to difference of pressure.
• 5. The charge is compressed by the pumping action of the piston due to the design of crankcase.
• 8. As the piston continues to move upward, exhaust and transfer port get closed and the compression is continued.
• 9. In the end of compression the spark is created which ignites the charge and the products of combustion thrust the piston from TDC to BDC.
• 10. This cycle is repeated continousely.
• The power developed will be nearly twice that of four-stroke engine of same dimension and operating at the same speed.
• The work required to overcome the friction of the exhaust and suction strokes is saved.
• Low weight.
• Construction is simple.
• As working on Otto-cycle, a part of the fresh mixture is lost through exhaust port.
• Part of the piston stroke is lost.
• Heavy consumption of lubricating oil.
• Cylinder head
• Intake valve
• Exhaust valve
• Timing gears
• Fuel injector
• The Fuel Injector is connected to a high pressure pump that is not illustrated.
• It sprays a small amount of diesel fuel into the Cylinder at the end of the Compression Stroke and beginning of the Power Stroke.
• The fuel is sprayed through several very small holes at very high pressure in order to form a fine mist of droplets of fuel that will ignite easily and burn quickly in the hot air.
• Four stroke engine
• Two stroke engine
• Cycle is completed in four strokes of piston in two revolution of crankshaft.
• Heavier flywheel is needed.
• Power produced for same size of engine is less.
• Volumetric efficiency is more due to more time for induction.
• Cycle is completed in two strokes of piston in one revolution of crankshaft.
• Lighter flywheel can be used.
• Power produced for same size of engine is twice.
• Volumetric efficiency is low due to lesser time for induction.

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