The document discusses the basic components and functions of a four-stroke internal combustion engine. It explains that a four-stroke engine converts gasoline into motion through intake, compression, combustion, and exhaust strokes. The key internal parts include the piston, connecting rod, crankshaft, camshaft, valves, spark plug, cylinders, and ports that allow air-fuel intake and exhaust gases out.

1. Presentation By:
Panchal Brothers

2. Engine is a device which transforms
one form of energy into the other
form.

3. Heat engine is a modified form of engine
used for transforming chemical energy of
fuel into thermal energy and
subsequently for producing work.

5.  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

6.  Two-stroke engines
 Diesel engines
 Rotary engines
 Turbine engines
 Steam engines

7. Intake Valve
Valve Cover
Intake Port
Head
Coolant
Engine Block
Oil Pan
Oil Sump
Crankshaft
Camshaft
Exhaust Valve
Spark Plug
Exhaust Port
Piston
Connecting Rod
Rod Bearings

8.  A. Intake Valve- opens at the proper time to
let in air and fuel.

9.  B. Valve Cover- Protects the valves and the
valve springs. Keeps dirt out and lubricating
oil in.

10.  C. Intake Port- the passageway in a cylinder
head for the fuel and air to pass through.

11.  D. Head- a platform containing most of the
parts of the combustion chamber.

12.  E. Coolant- circulating water and antifreeze
to keep the temperature regulated.

13.  F. Engine Block- cast in one piece. The basis
for most of the parts of the engine.

14.  G. Oil Pan- where the oil is collected and
recirculated.

15.  H. Oil Sump- the collected oil primarily for
lubricating the crankshaft and rod bearing

16.  I. Camshaft- a round shaft with lobes, that
rotates to open and close the fuel and
exhaust valves.

17.  J. Exhaust Valve- open at the proper time to
release the exhaust

18.  K. Spark Plug- a device, inserted into the
combustion chamber for firing an electrical
spark to ignite air-fuel mixture

19.  L. Exhaust Port- the passageway in a cylinder
head, for the exhaust to pass through

20.  M. Piston- the part of the engine that moves
up and down in the cylinder converting the
gasoline into motion

21.  N. Connecting Rod- links the piston to the
crankshaft.

22.  O. Rod Bearing- used to reduce friction to
the rod and crankshaft

23.  P. Crankshaft- converts the up and down
motion of the piston into a turning, or
rotating motion

24.  1.
 2.
 3.
 4.
Intake
Compression
Combustion
Exhaust

25.  Intake- process of
filling the cylinder
with the proper air-
fuel mixture
through the intake
valve.

26.  Compression- the
process of
compressing the
air-fuel mixture in
the cylinder to
make it more
combustible

27.  Combustion-the
process of igniting
the compressed air-
fuel mixture to
create motion and
the over all power
of the engine.

28.  Exhaust- the
process of
releasing the
exhaust out of the
cylinder through
the exhaust valve.