Chapter 1 Internal Combustion Engines - PowerPoint PPT Presentation

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Chapter 1 Internal Combustion Engines

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A four-stroke cycle engine is an internal combustion engine that utilizes four distinct piston strokes to complete each operating cycle. – PowerPoint PPT presentation

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Title: Chapter 1 Internal Combustion Engines


1
Chapter 1Internal Combustion Engines
  • Engine Classification Small Engine Development
    Energy Conservation Principles Small Engine
    History

2
Competencies
  • Explain the classification small engine and
    discuss the main small engine types.
  • Describe types of cylinder design and cooling
    systems.
  • Explain small engine development history.
  • Explain energy conversion principles that apply
    to small engines.
  • Explain heat transfer.
  • List the common energy conversion calculations.
  • Explain the chemistry of fuel combustion in small
    engines.
  • Describe the small engine industry.

3
Small Engines
  • internal combustion engine
  • converts heat energy from the combustion of fuel
    into mechanical energy
  • rated up to 25 horsepower (HP)
  • spark ignition or compression
  • four-stroke or two-stroke cycle

4
Engine Design
  • one, two, or four cylinders
  • cylinder orientation
  • vertical, horizontal, or slanted
  • cylinder configuration
  • V, horizontally-opposed, or in-line
  • air-cooled or liquid-cooled

5
Development History
  • gunpowder engine
  • steam engine
  • coal gas
  • internal combustion
  • gasoline power
  • diesel engine

6
Energy Conversion Principles
  • small engines convert potential energy into
    kinetic energy
  • all internal combustion engines operate utilizing
    basic principles of heat, force, pressure,
    torque, work, power, and chemistry

7
Heat Transfer
  • conduction is heat transfer from atom to atom via
    molecules in direct contact
  • convection is heat transfer by currents in a
    fluid
  • radiation is heat transfer that occurs as radiant
    energy without a material carrier

8
Energy Conversion Calculations
  • temperature is the intensity of heat
  • C (F 32) 1.8
  • F (1.8 C) 32
  • pressure is a force acting on a unit of area
  • pressure force area

9
Energy Conversion Calculations
  • torque is a force acting on a perpendicular
    radial distance from a point of rotation
  • torque force radius
  • work is the movement of an object by a constant
    force
  • work force distance

10
Energy Conversion Calculations
  • power is the rate at which work is done
  • power work time
  • horsepower (HP) is a measure of power equal to 76
    watts or 33,000 lb-ft per min
  • HP work (time 33,000)

11
Combustion Chemistry
  • combining of hydrocarbon fuel with oxygen
  • a chemical reaction between the hydrocarbon
    molecule and atmospheric oxygen combining at
    ignition temperature causes an exchange of
    elements that releases heat energy

12
Small Engine Industry
  • outdoor power equipment manufacturers
  • service technicians
  • Briggs Stratton MST program

13
Chapter 1 Review
  • In a typical small engine, approximately what
    percent of the energy released is converted into
    useful work?
  • Approximately 30 of the energy is converted into
    useful work.
  • What is horsepower?
  • Horsepower is a unit of power equal to 33,000
    lb-ft per min.
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