| Subject | English | German |
| tech. | engine with four cylinders horizontally opposed | liegender Vierzylinder mit paarweise gegenueberliegenden Zylindern (Boxer motor) |
| gen. | engine with four valves per cylinder | Motor mit vier Ventilen pro Zylinder |
| gen. | engine with four valves per cylinder | Vierventiler |
| engin. | flat-four engine | Vierzylinder-Boxer |
| tech. | flat four-engine | Boxermotor |
| tech. | flat four-engine | liegender Vierzylinder mit paarweise gegenueberliegenden Zylindern |
| gen. | four cycle engine | Viertaktmotor |
| met. | four cycle engine | Viertaktmaschine |
| gen. | four cycle engines | Viertaktmotoren |
| gen. | four engined | viermotorig |
| environ. | four stroke engine An internal combustion engine whose cycle is completed in four piston strokes; includes a suction stroke, compression stroke, expansion stroke, and exhaust stroke | Viertaktmotor |
| environ. | four stroke engine | Viertaktmotor |
| tech. | four-cycle diesel engine | Viertaktdieselmotor |
| amer. | four-cycle engine | Viertakter Viertaktmotor |
| engin. | four-cycle engine | Viertaktmotor |
| engin. | four-cylinder Diesel engine | Vierzylinder-Diesel |
| engin. | four-cylinder Diesel engine | Vierzylinder-Dieselmotor |
| tech. | four-cylinder engine | Vierzylindermaschine |
| tech. | four-cylinder engine | Vierzylindermotor |
| engin. | four-cylinder engine | Vierzylinder |
| engin. | four-cylinder engine with five valves per cylinder | Vierzylinder-Fünfventiler |
| engin. | four-cylinder engine with four valves per cylinder | Vierzylinder-Vierventilmotor |
| engin. | four-cylinder engine with four valves per cylinder | Vierzylinder-Vierventiler |
| engin. | four-cylinder engine with four valves per cylinder | Vierzylindermotor mit vier Ventilen pro Zylinder |
| engin. | four-cylinder engine with three valves per cylinder | Vierzylinder-Dreiventiler |
| engin. | four-cylinder engine with three valves per cylinder | Vierzylindermotor mit drei Ventilen pro Zylinder |
| engin. | four-cylinder engine with two valves per cylinder | Vierzylinder-Zweiventiler |
| engin. | four-cylinder four-stroke engine | Vierzylinder-Viertaktmotor |
| engin., amer. | four-cylinder gasoline engine | Vierzylinder-Benziner |
| engin., amer. | four-cylinder gasoline engine | Vierzylinder-Benzinmotor |
| engin. | four-cylinder in-line engine | Reihenvierzylinder |
| gen. | four-cylinder in-line engine | Vierzylinder-Reihenmotor |
| tech. | four-cylinder in-line engine | stehender Vierzylinder-Reihenmotor |
| engin. | four-cylinder in-line four-stroke engine | Reihenvierzylinder-Viertakter |
| engin. | four-cylinder in-line four-stroke engine | Vierzylinder-Viertakt-Reihenmotor |
| tech. | four-cylinder in-line inverted engine | haengender Vierzylinder-Reihenmotor |
| engin., amer. | four-cylinder 1.6-liter engine | 6 Liter Hubraum |
| engin., amer. | four-cylinder 1.6-liter engine | Vierzylinder mit 1 |
| engin., BrE | four-cylinder 1.6-litre engine | 6 Liter Hubraum |
| engin., BrE | four-cylinder 1.6-litre engine | Vierzylinder mit 1 |
| engin., BrE | four-cylinder petrol engine | Vierzylinder-Benziner |
| engin., BrE | four-cylinder petrol engine | Vierzylinder-Benzinmotor |
| engin. | four-cylinder two-stroke engine | Vierzylinder-Zweitaktmotor |
| engin., amer. | four-liter engine | Vierliter |
| engin., BrE | four-litre engine | Vierliter |
| engin. | four-rotor engine | Vierfachmotor |
| engin. | four-rotor engine | Vierscheibenmotor (Wankelmotor) |
| tech. | four-stroke cycle engine | Viertaktmotor |
| engin. | four-stroke Diesel engine | Viertakt-Dieselmotor |
| mech.eng. | four-stroke engine | Viertaktmotor |
| brit. | four-stroke engine | Viertakter Viertaktmotor |
| gen. | four-stroke engines | Viertaktmotoren |
| engin., amer. | four-stroke gasoline engine | Viertakt-Benzinmotor |
| engin. | four-stroke Otto engine | Viertakt-Ottomotor |
| engin., BrE | four-stroke petrol engine | Viertakt-Benzinmotor |
| engin. | four-stroke piston engine | Viertakt-Hubkolbenmotor |
| cycl. | four-stroke single cylinder engine | Viertakt-Single |
| cycl. | four-stroke single cylinder engine | Einzylinder-Viertaktmotor |
| tech. | four-stroke-engine | Viertaktmotor |
| engin. | four-valve engine | Vierventiler |
| engin. | four-valve engine | Vierventilmotor |
| transp., mech.eng. | pressure charged four-stroke diesel engine | Viertakt-Dieselmotor mit Aufladung |
| transp., tech. | pressure-charged four-stroke diesel engines | Viertakt-Dieselmotor mit Aufladung |
| engin. | square four engine | Vierzylinder-Blockmotor |
| gen. | straight-four engine | Vierzylinder-Reihenmotor |
| engin. | three-cylinder four-stroke engine | Dreizylinder-Viertaktmotor |
| engin. | twelve-cylinder engine with four valves per cylinder | Zwölfzylinder-Vierventiler |
| tech. | twenty-four-cylinder H-shaped engine | Vierundzwanzigzylinder-H-Motor |
| engin. | two-cylinder four-valve engine | Zweizylinder-Vierventiler |
| engin. | two-cylinder four-valve engine | Zweizylinder-Vierventilmotor |