1. Applying Laws of Mechanics (Physics) to the Internal Combustion Engine
Engine Terminology
Applying Laws of Mechanics (Physics) to the Internal Combustion Engine
Lesson 3
March 2008

2. Mass What state of matter is the engine?

4. Force
What is the definition of Force?

5. Push or pull (force) which starts, stops or changes motion of a body
What force is exerted on the piston?

6. What is the definition of Work?
When a body is moved by a force
How can we apply this to an engine?
What parts are doing the work?

7. Relationship to Work
Work = Distance Moved x Force Applied

8. What is Torque?
Turning or twisting force that causes a body to turn (rotate).
What part is turning in the engine?

9. Relationship of Torque
Torque = Length x Force Applied

10. Rate (Time - Speed) of doing work.
Power
Rate (Time - Speed) of doing work.
Power = Distance (ft) x Force (lbs)
Time (minutes)

11. Relationship to Power – Horse Power
(HP will be discussed in more detail in Lesson 7)
IHP (Indicated Horse Power)
-measurement of mechanical power produced from combustion cycle.
BHP (Brake Horse Power)
-measurement of mechanical power at crankshaft.

12. Energy

13. An engine uses chemical matter (gas and air) in a pre-determined mass (air-fuel ratio) to produce energy (heat) through the process of combustion. The expanding force (pressure) of these hot gasses, creates work through the momentum (motion) of various mechanical components

14. Air Fuel Charge
Which form of energy is this?

15. Combustion
Which form of energy is this?

16. The Combustion Process
Combustion is a controlled rapid burn (process) of gasses in a contained environment (combustion chamber). The energy (heat) of the expanding hot gases (pressure), is the harnessed ‘force’ used to do ‘work’.