Bore and Stroke Volume:
With the bore and the stroke volume, the cylinder volume can be calculated. The formula for a four-cylinder engine is as follows: Vs = c0/4 x d8 x S x 4
- Bore: This is the cylinder diameter, and it is always denoted in mm. (In the formula as d).
- Stroke: This is the distance the piston travels in the cylinder (from TDC to BDC). (In the formula as S).
The manufacturer’s specifications always include these data (e.g., a four-cylinder engine with a bore/stroke of 75 x 90). These can be calculated using a formula to find the cylinder volume.
Calculating Cylinder Volume:
The cylinder volume of this four-cylinder engine is calculated using the formula:
- We enter the engine data (bore, stroke, and the number of cylinders). This results in an answer in cubic millimeters, which is converted to cubic decimeters. This rounds to 1.6 liters.
- We now take as an example a six-cylinder engine with a bore/stroke volume of 88/85. The cylinder volume is 3.2 liters.
Long-Stroke Engine:
When the stroke length is greater than the bore, it is referred to as a long-stroke engine. (For example, 75 x 90).
Square Engine:
When the bore is larger than the stroke length, it is called a square engine. (For example, 90 x 75).
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