How to Port & Flow Test Cylinder Heads

How to Port & Flow Test Cylinder Heads

by David Vizard
How to Port & Flow Test Cylinder Heads

How to Port & Flow Test Cylinder Heads

by David Vizard

Paperback

$39.95 
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Overview

Porting heads is an art and science. It takes a craftsman's touch to shape the surfaces of the head for the optimal flow characteristics and the best performance. Porting demands the right tools, skills, and application of knowledge. Few other engine builders have the same level of knowledge and skill porting engine heads as David Vizard. All the aspects of porting stock as well as aftermarket heads in aluminum and cast-iron constructions are covered. Vizard goes into great depth and detail on porting aftermarket heads. Starting with the basic techniques up to more advanced techniques, you are shown how to port iron and aluminum heads as well as benefits of hand and CNC porting. You are also shown how to build a high-quality flow bench at home so you can test your work and obtain professional results. Vizard shows how to optimize flow paths through the heads, past the valves, and into the combustion chamber. The book covers blending the bowls, a basic porting procedure, and also covers pocket porting, porting the intake runners, and many advanced procedures. These advanced procedures include unshrouding valves, porting a shortside turn from the floor of the port down toward the valve seat, and developing the ideal port area and angle. All of these changes combine to produce optimal flow velocity through the engine for maximum power.

Product Details

ISBN-13: 9781934709641
Publisher: CarTech
Publication date: 02/23/2012
Pages: 160
Sales rank: 665,328
Product dimensions: 8.40(w) x 10.90(h) x 0.40(d)

About the Author

David Vizard is a revered engine builder and acknowledged Chevy big-block engine expert, which is why GM contracted him to develop several engine packages for the Chevy big-block crate program. He has authored more than 30 highly respected engine-building and automotive titles, penned about 4,000 magazine articles, and contributed scores of web articles 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. He currently owns and runs an engine research and development business in Charlotte, North Carolina.

Table of Contents

About the Author


Acknowledgments


Introduction


Chapter 1: What It Takes to Make Power
Point of Maximum Flow
Seat and Port Priorities
Do You Need a Flow Bench?


Chapter 2: Flow Testing Procedures
The Standard Pressure Drop
Real-World Test Pressures
Corrections
Floating Pressure-Drop Testing
Intake Fixation?
Flow Efficiency


Chapter 3: A Flow Bench—Build or Buy
A Rethink on Matters
Current Conclusions
Flowing the Exhaust
Establishing the Numbers
Summary
Budget Computerization
Audie Technology
Performance Trends
Other Bench Sources


Chapter 4: Wet-Flow Testing
Wet-Flow Testing—What’s it Worth?
Six Wet-Flow Mistakes to Avoid


Chapter 5: Porting Aftermarket Heads
Air Flow Research
Dart
Edelbrock
EngineQuest
Racing Head Service
Trick Flow Specialties


Chapter 6: Porting Tools, Consumables and Safety
Eye and Lung Safety
Grinders—Air or Electric
Carbide Cutters
Support Porting Tools
Sourcing Consumable Supplies
Chapter 7: Five Golden Porting Rules
Rule Number 1
Rule Number 2
Rule Number 3
Rule Number 4
Rule Number 5


Chapter 8: Developing Functional Ports
Valve Seat Forms
Working Valve Seat Shapes
Alternative Seat Angles
Seats on Valves
Valve Shapes
Clearances and Temperatures
Cutting Valve Seats

Chapter 9: Valve Shrouding
Practical De-shrouding


Chapter 10: Developing Functional Heads
Optimizing Cylinder Head Airflow
Valve and Flow
Ports
Cross-Sectional Area
Port Velocity
Applied Basic Porting
Compression Increase
Modified 170s on the Dyno
The Virtual Flow Bench


Chapter 11: The Combustion Process
Defining Combustion
Combustion Efficiency
British Touring Car Championship Year
Finally: The Chambers
More Combustion Curiosities
Atomization Optimization
Thermal Barriers
Swirl and Quench
More Thermal Management
Small Crevice Volume—Big Consequences
Conclusions


Chapter 12: Maximizing Compression Ratio
Thermodynamics Made Easy
Dynamic Compression
Intake- to Exhaust-Valve Ratios
Containing the Pressure


Source Guide

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