| The unburned fuel products of combustion that are forced pass the piston rings and into the crankshaft during the combustion stroke. | |
| A round hole in the engine block for the piston. | |
| Automatic temperature control system | |
| Rate of the volume in the cylinder above the piston when the piston is at bottom dead center to the volume in the cylinder above the piston when the piston is at top dead center. |