David Vizard's How to Port & Flow Test Cylinder Heads


Author Vizard covers blending the bowls, basic porting procedures, as well as pocket porting, porting the intake runners, and many advanced procedures. Advanced procedures include unshrouding valves and developing the ideal port area and angle.
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David Vizard's How to Port & Flow Test Cylinder Heads

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Author Vizard covers blending the bowls, basic porting procedures, as well as pocket porting, porting the intake runners, and many advanced procedures. Advanced procedures include unshrouding valves and developing the ideal port area and angle.
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Editorial Reviews

Mopar Muscle - Andy Bolig
ran news release on page 12 of Modified Mustangs & Fords April 2013
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Product Details

  • ISBN-13: 9781934709641
  • Publisher: CarTech, Incorporated
  • Publication date: 2/15/2012
  • Pages: 160
  • Sales rank: 472,545
  • Product dimensions: 8.40 (w) x 10.90 (h) x 0.40 (d)

Meet the Author

David Vizard is a revered engine builder, technical writer, and author. In fact, he has authored more than 30 highly respected engine building and automotive books, penned about 4,000 magazine articles, and contributed scores of web pieces to popular sites. Often referred to as Vizard the Wizard, his work is often the subject of blogs and editorial pieces in popular automotive magazines. Currently, he owns and runs MotorTec Magazine in Charlotte, North Carolina.
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Table of Contents

Table Of Contents:
About the Author 4
Acknowledgments 6
Introduction 7
Chapter 1: What It Takes to Make Power 14
Point of Maximum Flow 15
Seat and Port Priorities 15
Do You Need a Flow Bench? 16
Chapter 2: Flow Testing Procedures 18
The Standard Pressure Drop 18
Real-World Test Pressures 21
Corrections 21
Floating Pressure-Drop Testing 22
Intake Fixation? 23
Flow Efficiency 24
Chapter 3: A Flow Bench—Build or Buy 25
A Rethink on Matters 26
Current Conclusions 28
Flowing the Exhaust 28
Establishing the Numbers 29
Summary 31
Budget Computerization 31
Audie Technology 32
Performance Trends 35
Other Bench Sources 37
Chapter 4: Wet-Flow Testing 38
Wet-Flow Testing—What’s it Worth? 38
Six Wet-Flow Mistakes to Avoid 40
Chapter 5: Porting Aftermarket Heads 47
Air Flow Research 48
Dart 49
Edelbrock 51
EngineQuest 54
Racing Head Service 54
Trick Flow Specialties 55
Chapter 6: Porting Tools, Consumables and Safety 67
Eye and Lung Safety 67
Grinders—Air or Electric 68
Carbide Cutters 69
Support Porting Tools 69
Sourcing Consumable Supplies 74
Chapter 7: Five Golden Porting Rules 79
Rule Number 1 80
Rule Number 2 80
Rule Number 3 80
Rule Number 4 81
Rule Number 5 81
Chapter 8: Developing Functional Ports 82
Valve Seat Forms 82
Working Valve Seat Shapes 83
Alternative Seat Angles 84
Seats on Valves 87
Valve Shapes 87
Clearances and Temperatures 89
Cutting Valve Seats 91 Chapter 9: Valve Shrouding 96
Practical De-shrouding 97
Chapter 10: Developing Functional Heads 100
Optimizing Cylinder Head Airflow 100
Valve and Flow 101
Ports 101
Cross-Sectional Area 103
Port Velocity 105
Applied Basic Porting 108
Compression Increase 113
Modified 170s on the Dyno 113
The Virtual Flow Bench 114
Chapter 11: The Combustion Process 124
Defining Combustion 124
Combustion Efficiency 126
British Touring Car Championship Year 129
Finally: The Chambers 131
More Combustion Curiosities 132
Atomization Optimization 133
Thermal Barriers 135
Swirl and Quench 135
More Thermal Management 137
Small Crevice Volume—Big Consequences 138
Conclusions 143
Chapter 12: Maximizing Compression Ratio 144
Thermodynamics Made Easy 146
Dynamic Compression 148
Intake- to Exhaust-Valve Ratios 153
Containing the Pressure 157
Source Guide 158
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