The swept volume calculator uses swept volume = (((pi/4)*cylinder inner diameter^2)*stroke length) to calculate swept volume. Swept volume is defined as the volume swept by the piston as it moves from top dead center (T.D.C.) to bottom dead center (B.D.C.). This is referred to as Vs.
Contents
The stroke volume is equal to cylinder volume + dead volume + piston volume + seal volume + chamber volume. Compressed volume equals dead volume + seal volume + piston volume + chamber volume.
Displacement is the displacement of a cylinder. It is the volume between top dead center (TDC) and bottom dead center (BDC). When the piston moves from top to bottom, it “sweeps” its entire volume. This measurement can be in cubic inches or cubic centimeters.
Swept volume is the volume covered by the cylinder during reciprocation. The compression ratio r is defined as: r = 1 + VsVc. ⇒r=Vs+VcVc. Where Vs+Vc is the total volume, i.e. the sum of dead volume and stroke volume.
Cylinder volume is the volume of each cylinder in the engine and consists of 2 parts. Displacement x number of cylinders in the engine is the displacement of the engine. This is the number most people think of when describing the size of the engine.
In this example, the piston is .150″ in the bore. Calculate the exposed cylinder volume. Volume = (π) x (hole radius squared) x (exposed cylinder height). In this example, the bore (4,600 inches) and open cylinder 1.5 inches equals 40.9 cc.
In a naturally aspirated four-stroke engine, the theoretical maximum volume of air each cylinder can hold during the induction cycle is equal to that cylinder’s displacement (0.7854 x bore x bore x stroke).
Compression ratio formula
It can be calculated using the cylinder volume formula: Vd = b2 * s * π / 4 . Vc is the volume above the piston when the piston is at top dead center (its topmost position), also called compressed volume.
The equation for calculating displacement is: engine displacement = π/4 * bore² * stroke * number of cylinders. Displacement is usually measured in liters (L), cubic centimeters (CC), or cubic inches (CI).
(a) “Displacement” is the volume displaced by the piston as it moves between top dead center (TDC) and bottom dead center (BDC). This volume determines the capacity of the motor.
Top Dead Center/Bottom Dead Center
TDC – Top Dead Center is traditionally the position of an internal combustion engine’s piston when it is at the top of its stroke. BDC – Bottom Dead Center is the opposite when the piston is at the bottom of its stroke.
Square the radius of the circle and multiply the result by “pi” (the π symbol), or approximately 3.14. Multiply this result by the height of the cylinder, um to preserve its volume. So if the base of your cylinder has a radius of 3 cm, its area is 32 × 3.14, or 28.26 square centimeters.
To find the volume of a rectangular prism, multiply its 3 dimensions: length x width x height. The volume is expressed in cubic units.
Pistons are available with different head volumes. This is the size of the top of the flask. It is given in cubic centimeters (cc). We list head volume as it affects combustion chamber size. This helps in calculating the compression ratio.
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