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`"bore" = 2 * sqrt( v / ( pi * s * 1 ) )`

Enter a value for all fields

The **Cylinder Bore Size** calculator computes the cylinder bore (diameter) needed based on the total engine volume (displacement), the cylinder stroke length and the number of cylinders.

**INSTRUCTIONS:** Choose your preferred units and enter the following information:

- (
**v**) Total Engine Volume (displacement) - (
**s**) Stroke Length of the Cylinders - (
**c**) The number of Cylinders

**Cylinder Bore (D):** The calculator returns the size of the bore needed bore to achieve the desired displacement (v). The bore size is in inches. However, this can be automatically converted to other units (e.g. centimeters or mils) via the pull-down menu.

The formula for the Cylinder Bore Diameter is:

`D = 2 * sqrt(V / ( PI * S * n) )`

where:

- D = Cylinder Bore Diameter
- V = Volume or Displacement of engine
- S = Stroke Length of pistons
- n = Number of Cylinders

- Cylinder Bore Diameter based on the engine displacement, number of cylinders and the stroke length.
- Bore Stroke Ratio based on the diameter of the bore and the length of the stroke.
- Combustion Ratio base on the minimum and maximum displacements of the cylinder at the beginning (1-Induction) and compressed (3-Power) portions of the combustion cycle
- Displacement Ratio based on the volumes at the beginning and end of the stroke.
- Rod and Stroke Length Ratio base on the two lengths.
- Stroke Length based on the total engine displacement, number of cylinders and the bore.
- Piston Position based on the crank angle, crank radius, and rod length.
- Piston Deck Height based on Block Height, Rod Length, Stroke Length, and Pin Height.
- Total Volume (displacement) of a Combustion Engine based on the bore, stroke and number of cylinders.
- Volume (displacement) of a Engine Cylinder based on the bore and stroke.
- Volume (displacement) of an Engine with an Overbore based on the stroke, bore, overbore and number of cylinders.
- Equivalent Volume of a Rotary Engine based on the swept volume and number of pistons.
- Compressed Volume of a Cylinder when the piston is at the end of the stroke and the chamber is at its smallest (and most compressed) volume, based on the chamber, deck, crevice, chamfer, gasket, valve relief and dome/dish volumes. This is the second volume (V2) in the Compression Ratio
**calculation**. - Volume of a Gasket based on the inner and outer diameters and the gasket's thickness.
- Volume of a Cylinder Deck based on the deck height and the bore.
- Volume of a Cylinder Crevice based on the piston diameter, cylinder bore and the crevice height.
- Volume of a Cylinder Chamfer based on the cylinder diameter and the chamfer height and width.
- Clearance Volume of a Piston
- Engine Compression Raio
- Piston Speed (mean) based on stroke length and RPMs.
- Max Piston Speed based on stroke length and RPMs
- RPMs based on desired piston speed and stroke length.

- Camber Angle
- Camber Offset
- Breakover angle - Ground clearance between axles
- Approach angle - Ground clearance in front of or behind vehicle.
**Belt Length****Belt Speed**.**Pulley RPMs****2nd Pulley RPMs****2nd Pulley Diameter****RPM of 4th pulley on three shafts****2nd Gear RPM**