David Vizard's How to Super Tune and Modify Holley Carburetors

David Vizard's How to Super Tune and Modify Holley Carburetors

by David Vizard


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Product Details

ISBN-13: 9781934709658
Publisher: CarTech, Incorporated
Publication date: 10/15/2013
Series: S-A Design
Pages: 144
Sales rank: 407,532
Product dimensions: 8.30(w) x 10.90(h) x 0.40(d)

About 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.

Table of Contents

Acknowledgments 4
Introduction 5
Chapter 1: A Carb’s True Function 9
Functions of a Carburetor 9
The Impossible 10
Mileage Improvement 11
Chapter 2: Operating Principles 13
Basic Function 14
Exploring Venturi Properties 14
Applying the Venturi Effect 15
Air Correction Function 15
Calibration Considerations 16
Boosters 18
Idle and Transition System 20
Accelerator Pump System 21
Carb Sizing 21
Carb Options 22
Chapter 3: Calibration Requirements 27
Max-Power Mixture Ratio 27
Idle Mixture 29
Cruise Mixture 30
Chapter 4: Simple Mixture Measurement 33
The First Circuits to Calibrate 34
Accelerator Pump 37
Plug Reading 37
Track Practice 39
Stagger Jetting 41
Fuel Wash 42
Ignition Timing 43

Chapter 5: Mileage Calibration 45
Mileage Makers and Breakers 45
Vaporizing Factors 46
Enhancing Combustion Conditions 47
Cylinder Fill 47
The Spark 48
Some Unconventional Systems 51
Economy Tuning 54
Chapter 6: Carburetor Selection 56
How Much Carb CFM is Needed? 56
Volumetric Efficiency 57
High-Performance Dual-Planes 59
Multiple Carbs 62
Spacers 64
Vacuum Secondaries 65
Sizing with Alcohol-Based Fuels or Nitrous 66
Brake Specific Air Consumption 67
Chapter 7: Booster Science 68
Venturi Action 70
Booster Gain 70
Carb Sizing 72
Atomization Requirements 73
What’s It Worth? 75
Annular Discharge Booster Myth 76
Chapter 8: Idle and Transition Calibration 77
Idle Mixture Calibration 77
Oxygen Sensors 81
Road Test 81
Chapter 9: Full-Power Circuit Calibration 82
Main Jet 82
Cruise Calibrations 84
Max-Power Calibrations 85
Target Air/Fuel Ratios 87
Fuel Curve and Emulsion Wells 88
Weather and Altitude Changes 88
Vacuum Secondary Systems 89
Chapter 10: Accelerator Pump Circuit Calibration 94
Accelerator Pump Circuit 94
Accelerator Pump Components 95
Preliminary System Tune 96
Final System Tune 97
Part-Throttle Response 97
Chapter 11: Ram Air and Heat Management 99
Air Temperature 99
Fuel and Charge Temperatures 101
Artificial Charge Cooling 103
Super-Cooling Cool Can 105
Cool Fuel Compromises 105
Evaporative Cooling 106
ACC in Practice 107
Performance Conclusions 108
Chapter 12: Fuel Systems 109
Jet Extensions, Fuel Slosh and Fuel Level 110
Floats and Bowls 111
Needles and Seats 112
Pressure Regulators 114
Fuel Lines and Filters 117
Mechanical Fuel Pumps 118
Electric Pumps 119
Chapter 13: Calibrating for Various Fuels 121
Oxygenated Fuels 122
E85 125
Metering Blocks 127
Chapter 14: Improving Airflow 130
The Source of all Induction 130
Making More Air 131
Flow Mods: Phase One 132
Flow Mods: Phase Two 133
Flow Mods: Phase Three 136
Power Increase 139
Chapter 15: Intake Port Matching 140
Simple Port Matching 140
Complex Port Matching 142
Intentional Port Mismatching 142
Source Guide 144

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David Vizards How to Super Tune and Modify Holley Carburetors 5 out of 5 based on 0 ratings. 1 reviews.
GrammyGeek More than 1 year ago
Nothing strikes a cord faster in a car enthusiasts' mind as the word Holley. From beefed up street cars to the fastest racing cars, Holley carburetors have blazed a trail through performance car history. David Vizar has shared with us in his book How to Super Tune and Modify HOLLEY Carburetors wriiten for SA Design, his years of experience squeezing every bit of performance out of a Holley carburetor. The book covers the 4150-Series, Double Pumper, HP, Avenger, Ultra and Dominator carburetors. David's introduction is a brief history of his work from its humble beginnings leading up to his introduction to Holley. From there you get right into carburetion starting with the basics. Then you move into carburetion principles, calibration of mileage, various fuels and idle and transition, full-power and accelerator pump circuits. Also covered are ram air and heat management, fuel systems, air flow, intake port matching and so much more. Numerous charts in the book show all types of performance, illustrations, tech tips. Rounding the book out is a source guide on the last page. I am amazed at all the valuable information and lessons packed into this book. Yes it does cover specific Holley carburetors, but so much of the information can be applied to other caburetors. this is a valuable tool for any mechanics bookshelf. I did recieve a copy of this book in exchange for my honest review.