4 Cylinder Engine

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4 Cylinder Engine
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TDC (Top Dead Center)
BDC (Bottom Dead Center)
Piston
Cylinder
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Bore (Diameter of Cylinder)
Stroke (Measurement of the distance the piston
travels from bottom to top.)
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Engine Displacement
Compression Ratio
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Formula
Volume above the BDC Total Volume at TDC
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Formula
Total Engine Displacement
0.785 x (Bore)2 x Stroke X number of cylinders
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Total Cylinder Volume at BDC Total Chamber Volume
at TDC
Compression Ratio
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TDC
BDC
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Example
Volume at TDC Volume at BDC
.8 cubic inches 9 cubic inches

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Example
Cylinders Bore Stroke
4 cyl. 3.875 in. 3.25 in.

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9 .8
Compression Ratio
11.25 to 1
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.785 x (3.875)2 x 3.25 x 4
Engine Displacement
153.23 cubic in.
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Definition Measure of how much air
and fuel have compressed.
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Definition The volume of air in
all cylinders.
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CONVERSIONS
centimeters
LITERS
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Why do we need to convert? Because today, many
engines are sized by cubic centimeters or liters
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FORMULA 1 cubic in 16.387cc (take cubic
in. x 16.387)
FORMULA 1,000 cc 1 liter (Take cc/1000)
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Example Of How To Do A Conversion
Given Bore 3.875 inches
Stroke 3.25 inches
Step 1 Solve the problem using the formulas
using the inches. Answer for Displacement
153.23 cubic inches Step 2To
convert to Cubic Centimeters (cc)
(Round to the nearest tenth)
Take cubic inches x 16.387 (
153.23 x 16.387 2511) Step 3 To convert
to Liters (Round to the nearest
tenth) Take cc/1000
(2511/1000 2.5 liters)