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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 powerplants 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 in Performance Automotive Engine Math, and this book will surely be a strong addition to any high-performance library.
From the Publisher
High-performance racing engines differ from their street-based counterparts in many ways, but what specific internal design differences separate them? One answer lies in the math used to develop the best-possible performing powerplants for racing use. When engineered for maximum effectiveness and durability at high power levels and extreme RPM, performance engines of all types need to be built as a complete system. The sizes, clearances, and capabilities of these intricate machines are not chosen by chance, but rather through the use of proven formulas. 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.
Precision Tools
Precision measurement tools are required to obtain accurate results when blueprinting an engine. These include outside micrometers, digital calipers, dial indicators, snap gauges, height micrometers, graduated burettes and more.
Calculate Compression Ratios
This comparison between a domed piston and a dished piston illustrates how the dome projects into the combustion chamber to raise compression by reducing chamber volume while the dished piston increases combustion space volume to reduce compression ratio.
Prevent Disasters
Failure to record proper measurements and perform the required math often results in inappropriate mechanical relationships, such as an exhaust valve and piston top occupying the same space at the same time.
CC Combustion Chambers
Fill the checking burette to the top of the graduated fill marks. Then position the burette over the chamber, aligning the feed tip with the filling hole. Open the petcock and slowly fill the chamber with checking fluid.
What is Pi?
Pi (π) is the ratio of the circumference of a circle to its diameter. It is a mathematical constant that remains the same regardless of the size of the circle.
Engineers typically use pi carried out to five significant digits (3.1416) for accuracy and it has been shown that a value taken to eleven decimal places is sufficient to calculate the circumference of the earth to within 1 mm. Three digits (3.14) suffice for most requirements. π = Circumference ÷ diameter, or C ÷ d
This is often referred to as the circular constant. Pi can also be defined as the ratio of a circle’s area (A) to the area of a square whose side is equal to the radius of the circle.
Note that the sector scribed by the radius of the circle is 1/4 of pi. If you think about it, that’s how we get the displacement constant 0.7854, which is pi divided by 4. In effect, the length of that sector represents one side on an imaginary square smaller than a square with sides the length of the circle diameter.
Induction Math
Pro Stock and Pro Mod drag racing engines achieve VE percentages as high as 125 percent due to their narrow power band and the exceptional high speed efficiency of tunnel ram intake manifolds and split-Dominator style carburetors designed to take advantage of induction system wave tuning. (Courtesy Don Cooper/Reher & Morrison)
Exhaust Math
Equal length 4-into-1–style headers consistently outperform all other types, particularly when primary pipe crosssectional area is well matched to engine displacement and VE at torque peak RPM.
Camshaft Math
Most degree wheels are precise if you are careful about locating the position of the pointer. You can degree accurately with all of them, but many tuners prefer the larger-diameter professional degree wheel.
Atmospheric & Combustion Math
Affordable trackside weather stations like Altronic’s PerformAIRE Pocket unit are common at all levels of racing from Pro Stock to Saturday night bracket racing.
Publisher : CarTech; Illustrated edition (April 29, 2011)
Language : English
Paperback : 160 pages
ISBN-10 : 1934709476
ISBN-13 : 978-1934709474
Item Weight : 1.19 pounds
Dimensions : 8.5 x 0.38 x 11 inches
