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We ship world wide.
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Engine Math/ Quick Facts
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When you’re building an engine, it’s nice to be armed with the facts necessary to do it successfully.
Much of engine building is about m ath — machining dimensions, compression and rod ratios, bore
sizes, stroke, journal diameters, carburetor and port sizes, dynamic balancing, and all the rest of it.
Without math, you cannot successfully build an engine. What follows are quick facts that will help
you in your Ford engine building.
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Cubic-Inch Displacement
Cubic-inch displacement is simply the volume displaced by the cylinders of your engine. So, if we
calculate the volume of one cylinder, and multiply that figure times the number of cylinders, we have
the engine’s displacement.
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The formula for a cylinder’s volume is:
Pi x r2 x S = Volume of one cylinder.
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Where Pi is a mathematical constant equal to 3.14159; R is the radius of the cylinder, and S is the
stroke. If you think back to your high school geometry, you’ll remember that a circle’s radius is half
the diameter. In this case, the diameter is equal to the bore (B), so 1/2B=r. Plug that in, and our
formula becomes:
Pi x (1/2B)2 x S = Volume of one cylinder
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We can simplify this further by plugging in the numerical value for Pi, then doing some basic
algebra that doesn‘t necessarily need to be covered here — but trust us: the equation before is
equal to this equation:
B x B x S x 0.7854 = Volume of one cylinder
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To determine the engine’s displacement, factor in the number of cylinders (N):
B x B x S x 0.7854 x N = Engine displacement
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So, let’s use this to figure out the displacement of a Ford engine that has a 4-inch Bore and a
3-inch Stroke:
4.000” x 4.000” x 3.00” x 0.7854 x 8 = 301.59 ci
Ford rounded 301.59 up to 302 ci, or 4.9L.
(Note: One liter is equal to about 61 cubic inches.)
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Calculating Compression Ratio
An engine’s compression ratio is the ratio between two volumes: The volume of the cylinder and
combustion chamber when the piston is at BDC, and the volume of the combustion chamber when
the piston is at TDC. But there’s more to consider than just cylinder volume and head cc’s. To get
the engine’s TRUE compression ratio, you need to know these volumes:
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• Combustion Chamber Volume (C)
• Compressed Head Gasket Volume (G)
• Piston/Deck height (D)
• Piston Dish Volume (P) or Dome Volume (-P)
• Cylinder Volume (V)
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When the piston is at BDC, the total volume is all of these volumes added together. When the
piston is at TDC, the total volume is all of these EXCEPT the Cylinder Volume (V). So … true
compression ratio is this:
V + D + G + C + P
D + G + C + P
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Previous
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This has been a sample page from
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High Performance Ford Engine
Parts Interchange
by George Reid
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First-ever book about Ford parts interchange
Covers the entire range of Ford engines from
221-CID to 460-CID
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This is one of the best books ever written about Ford engines.
Covering both big- and small-block Ford V-8 engines, this
first-ever book on the subject provides indispensable information
to the Ford enthusiast. Included are high performance factory
parts, interchangeability between Ford Windsor and Cleveland
engines, extensive coverage of the 302 and 351 series as well as
the 352, 390, 406, 427, 428, 429, and 460 big block engines,
factory casting numbers, etc. Read the sample pages from each
chapter to learn more!
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Click below to view sample
pages from each chapter
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"If you are trying to mix and match cranks and rods, this book
will tell you if it can be done. If you are trying to find the correct
casting number for a Boss 429 distributor, this book will have it
listed. What we really find appealing about the book is that, not
only is it a perfect resource for those interested in factory
correct restorations, but it is equally as useful for the
performance oriented engine builder. Each chapter points out
building tips, such as how to improve a Cleveland's oiling
system, or what heads will yield the best horsepower gains. As
with all SA Design books, this one is filled with pages of detailed
photographs and diagrams. This book will prove to be a
priceless resource, as many of the original Ford V-8 parts
become harder and harder to come by." -- FORDMUSCLE
webmagazine, February, 2000
In Stock and Ready to Ship!
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Small Block Fords
Chap. 1 - Small Block Ford
Chap. 2 - Cylinder Block
Chap. 3 - Crankshaft & Rods
Chap. 4 - Oiling System
Chap. 5 - Cylinder Heads
Chap. 6 - Intake System
Chap. 7 - Ignition System
Chap. 8 - Exhaust Manifolds
Chap. 9 - Cooling System
Big Block Fords
Chap. 10 - Big Blocks
Chap. 11- Cylinder Block
Chap. 12 - Crankshaft & Rods
Chap. 13 - Oiling System
Chap. 14 - Cylinder Head
Chap. 15 - Intake System
Chap. 16 - Ignition System
Chap. 17 - Exhaust Manifolds
Chap. 18 - Cooling System
All Ford Engines
Chap. 19 - Gaskets
Chap. 20 - Engine Math
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Softbound
8-3/8 X 10-7/8
160 Pages
417 Color Photos
Item # SA56
Price: $22.95
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Click here to buy now!
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This is a great book that any Ford engine enthusiast or
engine builder is sure to love!
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How to Rebuild the Small Block Ford
This 144 page book guides you step by step through
a
rebuild, including: planning, disassembly and
inspection,
choosing the right parts, machine work,
assembling your
engine, first firing and break-in. It also
gives you helpful hints
and tips on performance
upgrades, including cams, heads,
ignition, induction,
and more. It also points out problem areas
to watch for,
professional builder tips, jobs that need special
care or
special tools, and more. Includes 495 color photos
and
covers the Ford 289, 302, 351W, 351C, 351M and 400.
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Price:
$
22.95
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The Step by Step Guide to Engine Blueprinting
Practical methods for racing and rebuilding, selecting and
preparing parts, and how to buy machine shop work. This
completely revised and updated version containing an
additional 32 pages is simply the best book you can buy on
engine preparation for street or racing! Engine Blueprinting
shows the reader how to use precision measuring tools,
calculate compression ratios, degree a camshaft, and much
more!
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Price:
$
19.95
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How to Build Big-Inch Ford Small Blocks
By increasing the bore and stroke of your current
engine, you can add those cubic inches without the
hassle of switching to a big block. George Reid
thoroughly explains the building of a small block Ford
stroker, paying special attention to the effect that
increasing the bore and stroke have on the engine as a
whole. Also included is a complete guide to factory head
and block castings, as well as aftermarket block and
head guides, so you can choose exactly the right parts
for your project.
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Price:
$
22.95
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How to Build Max Performance Ford V-8s on a Budget
This book addresses high-performance V-8 engines
such as the 289, 302, 351ci small-blocks found in
Mustangs, as well as the FE series of big-blocks.
Emphasis throughout is a budget approach to building
high performance power plants through the use of
over-the-counter factory components and selected
aftermarket pieces. Includes realistic, low-cost formulas
for building serious horsepower in Ford V-8 engines.
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Price:
$
22.95
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Payment, Shipping & Sales
Tax: Iowa
residents must pay 7% sales tax. Items usually ship
within one
business day of receipt of payment! Standard shipping is a flat rate of
$5.95 to
anywhere in the United States with USPS Media Mail.
Priority Mail shipping is available for an
additional $2.00, or
$7.95 for shipping. Shipping is combined and discounted for multiple item
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$1.95 for each additional item. For
purchases of 3 or more items
shipping is automatically upgraded to Priority for no additional
charge! We offer world wide shipping and ship to Canada and Mexico
with USPS Priority Mail
International for $21.95, and to most
locations in Europe, Australia, Asia, Japan and South
America for
$25.95. Satisfaction is Guaranteed. Our store has a NO HASSLE RETURN
POLICY
within 30 days of purchase.
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