Instructor Manual for
Automotive Engines
Diagnosis, Repair, and
Rebuilding 9 Edition By
th
Tim Gilles, Tim LeVan (All
Chapters 1-19, 100%
Original Verified, A+
Grade)
All Chapters Arranged
Reverse: 19-1
, Instructor Manual
Tim Gilles, Tim LeVan, Automotive Engines: Diagnosis, Repair, and Rebuilding, 9e,
9780357766248; 2024; Chapter 19: Producing Power; Valve Timing, Power and Torque
Measurement
TABLE OF CONTENTS
Purpose and Perspective of the Chapter......................................................................2
Chapter Objectives........................................................................................................2
Complete List of Chapter Activities and Assessments.................................................2
Key Terms.....................................................................................................................3
What’s New in This Chapter........................................................................................4
Chapter Outline.............................................................................................................4
Lesson Hints..................................................................................................................6
Reading Assignment.....................................................................................................6
Written Assignments....................................................................................................6
Chapter 19 Answers to Study Questions......................................................................6
Chapter 19 Answers to ASE-Style Review Questions..................................................7
© 2024 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible 1
website, in whole or in part.
, PURPOSE AND PERSPECTIVE OF THE CHAPTER
The purpose of this chapter is to inform students about how the engine produces power and how that
power is measured. Understanding how horsepower, torque, and other engine measurements are created
allows the student to understand the different specifications that are given to them from the OEM.
Camshafts play a large role within power production and should be viewed as a very vital component to
proper engine operation. Without these measurements or an understanding of engines, the student will not
know what the engine should do.
CHAPTER OBJECTIVES
Upon completion of this chapter, the student should be able to:
Describe how cam lobe profile affects high and low rpm engine performance
Advise customers on high-performance options for their engines
Discuss the operation of variable valve timing under various operating conditions
COMPLETE LIST OF CHAPTER ACTIVITIES AND
ASSESSMENTS
For additional guidance, refer to the Teaching Online Guide.
Chapter Objective Activity/Assessment Source (i.e., PPT Duration
slide, Workbook)
Learn the benefit Icebreaker PPT slide 2 10–15 minutes
of the ability to
adjust the valve
timing as the
engine is
operating in a
VVT engine.
Discuss what can Activity PPT slide 14 10–20 minutes
happen if the
camshaft profile is
changed in the
engine.
Using a Self-Assessment PPT slide 34 5–10 minutes
dynamometer, and
understanding
what the
technician is
measuring.
[return to top]
© 2024 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible 2
website, in whole or in part.
, KEY TERMS
advanced cam: When the intake valve is open more at TDC than the exhaust
asymmetrical cam lobe: A lobe that is ground differently on its opening and closing sides. Also called
non-symmetrical.
blowdown period: The time in degrees at the end of the power stroke when combustion pressure is bled
off before the piston begins to move up on the exhaust stroke
BMEP: Brake mean effective pressure
dynamometer: A brake device for loading the engine and measuring torque and horsepower
gross valve lift: Lobe lift multiplied by the rocker arm ratio
horsepower: The measurement of an engine’s ability to perform work.
ICE: Internal combustion engine.
lobe center angle: A camshaft angle, measured in camshaft degrees, that describes the lobe-to-lobe
distance by adding the centerlines of the intake and exhaust lobes together and then dividing by 2.
lobe lift: Lift measured at the cam lobe.
lost motion device: Movement of a reciprocating device where no work is done.
net valve lift: Gross valve lift minus valve lash specification.
Newton’s third law of motion: For every action there is an equal and opposite reaction.
phaser: Replaces the traditional camshaft sprocket to provide variable camshaft timing
pumping loss: When the engine has to work harder during idle or low-to-medium speed operation to
move air to TDC
retarded cam: When the exhaust valve is open more at TDC than the intake
split overlap: When the intake and exhaust valves are equally open at TDC
tolerance stacking: When two manufactured parts are combined, one on the large end of a tolerance
specification and the other on the small end of the tolerance
torque: A twisting effort that is the ability to make power
valve lift: Lift measured at the valve
volumetric efficiency (VE): The amount of air that an engine could theoretically breathe
© 2024 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible 3
website, in whole or in part.
Automotive Engines
Diagnosis, Repair, and
Rebuilding 9 Edition By
th
Tim Gilles, Tim LeVan (All
Chapters 1-19, 100%
Original Verified, A+
Grade)
All Chapters Arranged
Reverse: 19-1
, Instructor Manual
Tim Gilles, Tim LeVan, Automotive Engines: Diagnosis, Repair, and Rebuilding, 9e,
9780357766248; 2024; Chapter 19: Producing Power; Valve Timing, Power and Torque
Measurement
TABLE OF CONTENTS
Purpose and Perspective of the Chapter......................................................................2
Chapter Objectives........................................................................................................2
Complete List of Chapter Activities and Assessments.................................................2
Key Terms.....................................................................................................................3
What’s New in This Chapter........................................................................................4
Chapter Outline.............................................................................................................4
Lesson Hints..................................................................................................................6
Reading Assignment.....................................................................................................6
Written Assignments....................................................................................................6
Chapter 19 Answers to Study Questions......................................................................6
Chapter 19 Answers to ASE-Style Review Questions..................................................7
© 2024 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible 1
website, in whole or in part.
, PURPOSE AND PERSPECTIVE OF THE CHAPTER
The purpose of this chapter is to inform students about how the engine produces power and how that
power is measured. Understanding how horsepower, torque, and other engine measurements are created
allows the student to understand the different specifications that are given to them from the OEM.
Camshafts play a large role within power production and should be viewed as a very vital component to
proper engine operation. Without these measurements or an understanding of engines, the student will not
know what the engine should do.
CHAPTER OBJECTIVES
Upon completion of this chapter, the student should be able to:
Describe how cam lobe profile affects high and low rpm engine performance
Advise customers on high-performance options for their engines
Discuss the operation of variable valve timing under various operating conditions
COMPLETE LIST OF CHAPTER ACTIVITIES AND
ASSESSMENTS
For additional guidance, refer to the Teaching Online Guide.
Chapter Objective Activity/Assessment Source (i.e., PPT Duration
slide, Workbook)
Learn the benefit Icebreaker PPT slide 2 10–15 minutes
of the ability to
adjust the valve
timing as the
engine is
operating in a
VVT engine.
Discuss what can Activity PPT slide 14 10–20 minutes
happen if the
camshaft profile is
changed in the
engine.
Using a Self-Assessment PPT slide 34 5–10 minutes
dynamometer, and
understanding
what the
technician is
measuring.
[return to top]
© 2024 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible 2
website, in whole or in part.
, KEY TERMS
advanced cam: When the intake valve is open more at TDC than the exhaust
asymmetrical cam lobe: A lobe that is ground differently on its opening and closing sides. Also called
non-symmetrical.
blowdown period: The time in degrees at the end of the power stroke when combustion pressure is bled
off before the piston begins to move up on the exhaust stroke
BMEP: Brake mean effective pressure
dynamometer: A brake device for loading the engine and measuring torque and horsepower
gross valve lift: Lobe lift multiplied by the rocker arm ratio
horsepower: The measurement of an engine’s ability to perform work.
ICE: Internal combustion engine.
lobe center angle: A camshaft angle, measured in camshaft degrees, that describes the lobe-to-lobe
distance by adding the centerlines of the intake and exhaust lobes together and then dividing by 2.
lobe lift: Lift measured at the cam lobe.
lost motion device: Movement of a reciprocating device where no work is done.
net valve lift: Gross valve lift minus valve lash specification.
Newton’s third law of motion: For every action there is an equal and opposite reaction.
phaser: Replaces the traditional camshaft sprocket to provide variable camshaft timing
pumping loss: When the engine has to work harder during idle or low-to-medium speed operation to
move air to TDC
retarded cam: When the exhaust valve is open more at TDC than the intake
split overlap: When the intake and exhaust valves are equally open at TDC
tolerance stacking: When two manufactured parts are combined, one on the large end of a tolerance
specification and the other on the small end of the tolerance
torque: A twisting effort that is the ability to make power
valve lift: Lift measured at the valve
volumetric efficiency (VE): The amount of air that an engine could theoretically breathe
© 2024 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible 3
website, in whole or in part.
