Very basic CR measurement.
Spark plug out, piston at TDC. Using a suitable liquid (thin oil) measure the volume required to fill the chamber to the bottom of the spark plug thread.
Calculate the swept volume of the engine pi x radius squared x height.
Divide swept volume by chamber volume.
Spark plug out, piston at TDC. Using a suitable liquid (thin oil) measure the volume required to fill the chamber to the bottom of the spark plug thread.
Calculate the swept volume of the engine pi x radius squared x height.
Divide swept volume by chamber volume.
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