Make sure the piston is at TDC and seal the gap between the cylinder wall and the piston with grease (this will prevent seepage past the rings giving a false reading). In such cases it is best to measure the compressed area with the cylinder head fitted. Some engines with irregular piston crown shapes, especially raised areas, may be difficult to quantify with any degree of accuracy. Calculate the volume of the gasket and deck height areas and add these to the chamber volume to arrive at the total compressed volume. Measure the volume of the cylinder and/or piston chambers using a suitable burette filled with paraffin. 4 cylinder 1600cc engine = 400cc per cylinder.Ĭompressed volume is the area above the piston crown when the piston is at its highest point or top dead centre (TDC).ġ) The combustion chamber (usually in the cylinder head as shown, but can also be in the piston crown),ģ) The area between the cylinder block face and the piston crown, commonly referred to as the 'deck height'. of cylinders)ġ600cc 4 cylinder engine with an 81mm bore sizeġ600 ÷ (0.7854 x 8.1 x 8.1 x 4) = 1600 ÷ 206.12 = 7.76cm (77.6mm)Ĭylinder capacity is the total engine displacement divided by the number of cylinders.Į.g. Number of cylindersĭivide engine capacity by: (0.7854 x bore x bore x no.
In the above example we have used centimetres to calculate capacity in cubic centimetres. Number of cylindersĠ.7854 x bore x bore x stroke x number of cylinders.īore = 81mm (8.1cm), Stroke = 77.6mm (7.76cm), cylinders = 4 Engine Capacity/Displacement Information required:ġ.
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