4 calculators in this category
- Engine Displacement CalculatorSwept-volume definition (SAE J1349 engine displacement)Engine displacement is the total volume every piston sweeps in one full revolution of the crank, and it follows directly from…
- Engine Compression Ratio CalculatorSAE static compression ratio definitionStatic compression ratio is the single number that decides which fuel your engine can live on, and it is set entirely by…
- Dynamic Compression Ratio CalculatorSlider-crank piston position, polytropic compressionStatic compression ratio assumes the intake valve shuts at bottom dead centre. It never does. On any cam worth fitting the…
- Bore to Stroke Ratio CalculatorSwept-volume engine geometryEnter your bore and stroke and this calculator returns the bore/stroke ratio, its inverse, the classification every engine…
Which one do you need?
- Engine Displacement Calculator
- Calculate engine displacement in cubic inches, cc and liters from bore, stroke and cylinder count, plus the exact gain from any overbore size.
- Engine Compression Ratio Calculator
- Calculate static compression ratio from bore, stroke, chamber cc, gasket, deck clearance and piston dish. Get the chamber volume for a target ratio.
- Dynamic Compression Ratio Calculator
- Calculate dynamic compression ratio from bore, stroke, rod length, static CR and intake valve closing point, plus effective stroke and cranking pressure.
- Bore to Stroke Ratio Calculator
- Work out bore/stroke ratio from your bore and stroke, classify the engine as oversquare, square or undersquare, and see displacement and piston speed.