Examples
Examples
Try the starting example
- Cylinder bore (mm)
- 80
- Stroke (mm)
- 80
- Combustion chamber volume (cm³)
- 40
- Compressed gasket volume (cm³)
- 5
- Deck clearance volume, signed (cm³)
- 2
- Piston crown clearance contribution, signed (cm³)
- -3
- Swept cylinder volume (cm³)
- 402.12386
- Total clearance volume (cm³)
- 44
- Static geometric compression ratio
- 10.139179
Try another scenario
- Cylinder bore (mm)
- 80
- Stroke (mm)
- 90
- Combustion chamber volume (cm³)
- 40
- Compressed gasket volume (cm³)
- 5
- Deck clearance volume, signed (cm³)
- 2
- Piston crown clearance contribution, signed (cm³)
- -3
- Swept cylinder volume (cm³)
- 452.389342
- Total clearance volume (cm³)
- 44
- Static geometric compression ratio
- 11.281576
Calculation method
Calculation method
Swept cylinder volume (cm³)
pi*bore²*stroke/4/1000.
Total clearance volume (cm³)
chamber+gasket+deck+piston; dish positive, dome negative.
Static geometric compression ratio
(swept+clearance)/clearance.
Symbols and units
- a
- Cylinder bore (mm)
- b
- Stroke (mm)
- c
- Combustion chamber volume (cm³)
- d
- Compressed gasket volume (cm³)
- e
- Deck clearance volume, signed (cm³)
- f
- Piston crown clearance contribution, signed (cm³)
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions & limits
Assumptions & limits
- Static per-cylinder volume geometry; gasket/deck/piston volumes explicitly supplied with stated sign convention. No dynamic compression, fuel, ignition, mechanical suitability or engine safety inference. Supported limits: bore,stroke>0; chamber,gasket>=0; signed deck/piston finite; totalClearance>0.
Are these inputs private?
These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.