Performance Automotive Engine Math by John BaechtelPerformance Automotive Engine Math by John Baechtel

Performance Automotive Engine Math

byJohn Baechtel

Paperback | April 29, 2011

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All the parts within any engine are designed and engineered using the appropriate mathematics to function efficiently and be durable. When discussing high-performance automotive engines, a specific set of math formulas are used to develop and design power plants to make more power at higher rpm levels and still survive. The various forms of motorsport and street use all have different requirements, but the math used to design engines to be competitive does not change, regardless of the specific discipline.

Multi-time author and well-regarded performance engine builder/designer John Baechtel has assembled the relevant mathematics and packaged it all together in a book designed for automotive enthusiasts. This book walks readers through the complete engine, showcasing the methodology required to define each specific parameter, and how to translate the engineering math to the hard measurements reflected in various engine parts. Designing the engine to work as a system of related components is no small task, but the ease with which Baechtel escorts the reader through the process makes this book perfect for both the budding engine enthusiast and the professional builder.

Author Baechtel's experience and writing capabilities shine inPerformance Automotive Engine Math, and this book will surely be a strong addition to any high-performance library.

Title:Performance Automotive Engine MathFormat:PaperbackDimensions:160 pages, 11 × 8.5 × 0.38 inPublished:April 29, 2011Publisher:CartechLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:1934709476

ISBN - 13:9781934709474

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Table of Contents


Foreword by Jim McFarland



Chapter 1: Basic Math and Science

Core Principles


Chapter 2: Engine Displacement 

Cylinder Bore Diameter 

Stroke Length

Calculating Displacement

Calculating Overbore Displacement

Calculating Bore and Stroke Relationships 

Bore/Stroke and Rod/Stroke Ratios

Metric Conversions

Equivalent Displacement

What is Bore Spacing? 

Sonic Checking 

Practie Calculations

Displacement Formulas at a Glance 


Chapter 3: Compression Ratio

Factors Affecting Compression Ratio

Finding V2 

Displacement Ratio

Cranking Compression

Compression Ratio Formulas at a Glance


Chapter 4: Piston Speed 

Maximum Piston Speed

Piston Acceleration

Calculating RPM Limits 

Engine Balancing and Overbalancing 

Calculating Piston Position

Piston Speed Formulas at a Glance


Chapter 5: Brake Horsepower and Torque

Calculating Horsepower from Torque 

How to Read a Dyno Sheet, Part 1

Horsepower and Torque Ratings

Indicated Horsepower

Indicated Torque

Brake Mean Effective Pressure 

Mechanical Efficiency

Torque and HP Formulas at a Glance


Chapter 6: Induction Math 

Engine Air Capacity 

Volumetric Efficiency 

Intake Manifolds

Street Carburetor vs Race Carburetor 

Choosing Throttle Body Size 

Calculating Turbocharger Carburetor Size

Sizing a Turbocharger 

Boost and Supercharger Drive Ratios

Wave Tuning

Ram Effects and Inlet Cooling

How to Calculate Runner Cross Section

Induction Formulas at a Glance 


Chapter 7: Cylinder Head Math

Converting Combustion Chamber Sizes 

Evaluating Port Volumes 

Calculating Valve Curtain Area 

Calculating Optimum Port Area from Valve Size

Calculating Minimum Port Area 

Calculating Port Velocity

Estimating Peak Engine Speed from Airflow

Predicting Horsepower from Airflow

Looking at Valve-Lift-to-Diameter Ratios 

Comparing Flow at Different Test Pressures

Understanding Exhaust-to-Intake Ratio

Cylinder Head Formulas at a Glance


Chapter 8: Exhaust System Math

PipeMax Exhaust System Calculations

Calculating Primary Tube Cross Section 

Calculating Primary Tube Length

Calculating Collector Diameter and Length 

Food for Thought

Exhaust System Wave Dynamics

Exhaust System Formulas at a Glance 


Chapter 9: Fuel System Math 

Understanding BSFC

How to Read a Dyno Sheet, Part 2

Fuel System Calculations 

Fuel System Formulas at a Glance 


Chapter 10: Atmospherics and Combustion Math 

Atmospheric Effects on Engine Performance 

Density Altitude

Performance Weather Stations 

Lambda and Air/Fuel Ratios

Dynamometer Correction Factors 

Atmospheric/Combustion Formulas at a Glance 


Chapter 11: Camshaft Math 

Lobe Centers 

Understanding Cam Specs

Calculating Valve Lift 

Finding TDC

Degreeing the Cam

Calculating Valve Overlap 

Camshaft Formulas at a Glance


Chapter 12: Tools and Equipment 

Measurement Tools, Standards and Accuracy


Chapter 13: How To Build an Engine Math Spreadsheet 

Finding Displacement

Finding Piston Speed 

Finding Stroke Length 

Other Calculators

Engine Build/Content Sheet

Engine Assembly Sheet


Chapter 14: Engine Simulation and Modeling Software

Performance Trends 

Racing Systems Analysis 

Comp Cams/ProRacing Sim

Motion Software 

Support Programs


Appendix A: Abbreviations and Acronyms 


Appendix B: Handy Conversion Factors 


Appendix C: Glossary


Source Guide