| ICEPICKS | Internal combustion engine selects gear for climbing (3-5) |
| MOTORCAR | It's propelled by an internal combustion engine (5,3) |
| RADIATOR | Device used for cooling an internal-combustion engine |
| BREATHER | Vent for ventilation or depressurising, as in the crankcase of an internal-combustion engine (8) |
| CAMSHAFT | Fat chasm (anag) - internal-combustion engine part (8) |
| IGNITION | It starts the fuel in an internal combustion engine (8) |
| CYLINDER | The chamber of an internal combustion engine, pump, compressor etc. |
| TURBOJET | Aeroplane powered by an internal-combustion engine (8) |
| MONOXIDE | Colourless, odourless, toxic gas produced by an internal combustion engine (6,8) |
| GOTTLIEB | German engineer and car manufacturer who collaborated with Nikolaus Otto in inventing the first internal-combustion engine (8,7) |
| MAGNETOS | Alternators in some internal-combustion engines |
| BIGEND | Larger end of the connecting rod in an internal combustion engine (3,3) |
| PETROL | Fuel for the internal combustion engine (6) |
| SPARKPLUG | Electrical device in an internal-combustion engine (5,4) |
| OUTBOARDMOTOR | Internal-combustion engine that mounts at stern of small boat (8,5) |
| FUELINJECTION | Direct introduction of essential element for internal combustion engine (4,9) |
| REV | Revolution in internal combustion engine (3) |
| REVUP | Increase speed in an internal-combustion engine (3,2) |
| TWOSTROKE | Type of internal combustion engine (3-6) |
| ICE | Internal combustion engine's initial coolness (3) |
