small engines ch 1

7/25/2019 Small Engines Ch 1

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PowerPointPresentation

Chapter 1Chapter 1Internal Combustion EnginesInternal Combustion Engines

Engine Classification Small EngineEngine Classification Small EngineDevelopment Energy ConservationDevelopment Energy Conservation

Principles Small Engine HistoryPrinciples Small Engine History


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Chapter 1 Internal Combustion Engines

CompetenciesCompetencies Explain the classification small engine and discuss theExplain the classification small engine and discuss the

main small engine types.main small engine types.

Descrie types of cylinder design and cooling systems.Descrie types of cylinder design and cooling systems.

Explain small engine development history.Explain small engine development history.

Explain energy conversion principles that apply to smallExplain energy conversion principles that apply to smallengines.engines.

Explain heat transfer.Explain heat transfer.

!ist the common energy conversion calculations.!ist the common energy conversion calculations.

Explain the chemistry of fuel comustion in small engines.Explain the chemistry of fuel comustion in small engines.

Descrie the small engine industry.Descrie the small engine industry.


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Small EnginesSmall Engines internal comustion engineinternal comustion engine

converts heat energy from theconverts heat energy from the

comustion of fuel into mechanical energycomustion of fuel into mechanical energy

rated up to "# horsepo$er %HP&rated up to "# horsepo$er %HP&

spar' ignition or compressionspar' ignition or compression

four(stro'e or t$o(stro'e cyclefour(stro'e or t$o(stro'e cycle


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Engine DesignEngine Design one) t$o) or four cylindersone) t$o) or four cylinders

cylinder orientationcylinder orientation vertical) hori*ontal) or slantedvertical) hori*ontal) or slanted

cylinder configurationcylinder configuration +) hori*ontally(opposed) or in(line+) hori*ontally(opposed) or in(line

air(cooled or li,uid(cooledair(cooled or li,uid(cooled


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Development HistoryDevelopment History gunpo$der enginegunpo$der engine

steam enginesteam engine

coal gascoal gas internalinternal

comustioncomustion

gasoline po$ergasoline po$er diesel enginediesel engine


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Energy Conversion PrinciplesEnergy Conversion Principles small engines convert potential energysmall engines convert potential energy

into 'inetic energyinto 'inetic energy

all internal comustion engines operateall internal comustion engines operateutili*ing asic principles of heat) force)utili*ing asic principles of heat) force)

pressure) tor,ue) $or') po$er) andpressure) tor,ue) $or') po$er) and

chemistrychemistry


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Heat -ransferHeat -ransfer conduction is heat transfer from atom toconduction is heat transfer from atom to

atom via molecules in direct contactatom via molecules in direct contact

convection is heat transfer y currents inconvection is heat transfer y currents ina fluida fluid

radiation is heat transfer that occurs asradiation is heat transfer that occurs as

radiant energy $ithout a material carrierradiant energy $ithout a material carrier


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Energy ConversionEnergy Conversion

CalculationsCalculations temperature is the intensity of heattemperature is the intensity of heat

C / %0 1 2"& 3 4.5C / %0 1 2"& 3 4.5

0 / %4.5 6 C& 7 2"0 / %4.5 6 C& 7 2"

pressure is a force acting on a unit ofpressure is a force acting on a unit of

areaarea pressure / force 3 areapressure / force 3 area


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CalculationsCalculations tor,ue is a force acting on ator,ue is a force acting on a

perpendicular radial distance from aperpendicular radial distance from a

point of rotationpoint of rotation tor,ue / force 6 radiustor,ue / force 6 radius

$or' is the movement of an o8ect y a$or' is the movement of an o8ect y a

constant forceconstant force $or' / force 6 distance$or' / force 6 distance


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CalculationsCalculations po$er is the rate at $hich $or' is donepo$er is the rate at $hich $or' is done

po$er / $or' 3 timepo$er / $or' 3 time

horsepo$er %HP& is a measure of po$erhorsepo$er %HP& is a measure of po$ere,ual to 9: $atts or 22);;; l(ft per mine,ual to 9: $atts or 22);;; l(ft per min HP / $or' 3 %time 6 22);;;&HP / $or' 3 %time 6 22);;;&


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Comustion ChemistryComustion Chemistry comining of hydrocaron fuel $ithcomining of hydrocaron fuel $ith

oxygenoxygen

a chemical reaction et$een thea chemical reaction et$een thehydrocaron molecule and atmospherichydrocaron molecule and atmospheric

oxygen comining at ignitionoxygen comining at ignition

temperature causes an exchange oftemperature causes an exchange ofelements that releases heat energyelements that releases heat energy


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Small Engine Stratton?S- program?S- program


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Chapter 4 @evie$Chapter 4 @evie$In a typical small engine, approximatelyIn a typical small engine, approximately

what percent of the energy released iswhat percent of the energy released is

converted into useful work?converted into useful work? Approximately 2;B of the energy is convertedApproximately 2;B of the energy is converted

into useful $or'.into useful $or'.

What is horsepower?What is horsepower? Horsepo$er is a unit of po$er e,ual to 22);;;Horsepo$er is a unit of po$er e,ual to 22);;;

l(ft per min.l(ft per min.

small engines ch 1

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