CR CALCULATOR

Engineering-grade static compression ratio calculation with physical modeling. Deck clearance and piston geometry resolved independently — no approximations.

Cylinder Geometry

Boremm

Strokemm

Cylinderspcs

Total Displacementauto

—cc

Combustion Chamber

Head Chamber Volumecc

Gasket Thicknessmm

Measurement Data

Measured Volumecc

At Piston Heightmm

Actual Deck Clearancemm

How to measure

Set piston to a known height below TDC using a dial gauge. Fill from the spark plug hole with burette until flush. Record volume and piston height. Deck clearance is measured separately at TDC with a dial gauge — do not derive from the burette measurement.

Static Compression Ratio

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Fill all inputs

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