| GASKET | Mechanical seal in an internal combustion engine. (6) |
| TAPPET | Moving part in an internal combustion engine |
| COMPRESSION | Reduction in volume of the air-fuel mixture in an internal-combustion engine prior to ignition, causing an increase in pressure (11) |
| SUMP | An oil reservoir in an internal combustion engine (4) |
| SPARKPLUG | Electrical device in an internal-combustion engine (5,4) |
| IGNITION | It starts the fuel in an internal combustion engine (8) |
| CARBURETTOR | Device in an internal-combustion engine (11) |
| REVUP | Increase speed in an internal-combustion engine (3,2) |
| DIESEL | An internal-combustion engine that burns heavy oil (6) |
| CARBON | Colourless, odourless, toxic gas produced by an internal combustion engine (6,8) |
| MAGNETO | Small electric generator such as that producing a spark in an internal combustion engine |
| COIL | Transformer in an internal-combustion engine that supplies high voltage to the spark plugs (4) |
| BIGEND | Part of an internal combustion engine |
| MONOXIDE | Colourless, odourless, toxic gas produced by an internal combustion engine (6,8) |
| BREATHER | Vent for ventilation or depressurising, as in the crankcase of an internal-combustion engine (8) |
| CYLINDER | The chamber of an internal combustion engine, pump, compressor etc. |
| CARBONMONOXIDE | Colourless, odourless, toxic gas produced by an internal combustion engine |
| MOTORCAR | It's propelled by an internal combustion engine (5,3) |
| CAMSHAFT | It operates the valves of an internal-combustion engine (8) |
| VALVETRAIN | * Part of an internal-combustion engine |
