| SPARKPLUGS | Devices screwed into the cylinder head of an internal-combustion engine which ignite the explosive mixture |
| SPARKPLUG | Electrical device fitted in the cylinder heads of an internal-combustion engine (5,4) |
| INLETVALVE | Engine component that transfers fuel into the cylinder. (5,5) |
| PRIMED | Of a steam loco, suffered from water carried into the cylinders (6) |
| PRIMES | Of a steam locomotive, passes excess water into the cylinders (6) |
| PULSEJET | Type of engine which propelled the V-1 flying bomb |
| RUDOLFDIESEL | German engineer who invented a type of engine, which is named after him (6,6) |
| SETALIGHT | Ignite the Greek character caught in an insult (3,6) |
| MATCHLOCK | Musket using a slow-burning wick to ignite the charge (9) |
| ALTAVISTA | Early web search engine which literally means 'high view' (9) |
| SCOTCHFIR | Whisky could almost ignite the pine (6,3) |
| CAMSHAFT | Rotating element of an internal-combustion engine by which the valves of the cylinder are opened (8) |
| ROTOR | What is the revolving arm of the distributor of an internal-combustion engine? (5) |
| TURBOCHARGER | A centrifugal compressor which boosts the intake pressure of an internal-combustion engine |
| CYLINDERHEAD | Top plate of an internal combustion engine that holds the injectors and spark plugs (8,4) |
| IGNITION | The firing system of an internal combustion engine, such as in a conventional motor vehicle (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. |
| GASKET | Mechanical seal such as one between a cylinder head and block in an internal-combustion engine (6) |
| VALVETRAIN | * Part of an internal-combustion engine |
