**Subjects:**

- Bore and Stroke Volume
- Calculate cylinder capacity
- Long stroke engine
- Square motor

**Bore and Stroke Volume:**The cylinder capacity can be calculated with the bore and the stroke volume. The formula for a four-cylinder engine is as follows:

**Vs = π/4 x d² x S x 4**

- Bore: This is the cylinder diameter, and is always shown in mm. (In the formula as d).
- Stroke: This is the distance the piston travels in the cylinder (from ODP to TDC). (In the formula as S).

This data is always stated in the data of a car manufacturer (eg a four-cylinder engine with the bore / stroke 75 X 90). This data can be calculated with a formula to a cylinder capacity.

**Calculating cylinder capacity:**

The displacement of this four-cylinder engine is calculated with the formula:

**Long stroke engine:**

When the stroke length is greater than the bore, it is called a long stroke engine. (e.g. 75 X 90).

**Square motor:**When the bore is greater than the stroke length, it is called a square engine. (e.g. 90 X 75).

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