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| EF-Type engine | |
|---|---|
 | |
| Overview | |
| Manufacturer |  Renault Sport |
| Designer | Bernard Dudot François Castaing (base design) |
| Production | 1977–1986 |
| Layout | |
| Configuration | 90° V-6 |
| Displacement | 1.5 L (1,491.7 cc) 1.5 L (1,493.6 cc) |
| Cylinder bore | 86 mm (3.39 in) 80.1 mm (3.15 in) |
| Piston stroke | 42.8 mm (1.69 in) 49.4 mm (1.94 in) |
| Compression ratio | 7.0:1-7.5:1 |
| Combustion | |
| Turbocharger | Garrett or KKK |
| Fuel system | Electronic fuel injection |
| Fuel type | Gasoline |
| Cooling system | Water-cooled |
| Output | |
| Power output | 510–1,320 bhp (380–984 kW; 517–1,338 PS) |
| Torque output | 290–660 lb⋅ft (393–895 N⋅m)[1] |
| Dimensions | |
| Dry weight | 179 kg (394.6 lb)[2] |
| Chronology | |
| Predecessor | CH |
| Successor | RS |
The EF-Type was a Turbocharged 90° V6 racing engine developed by Renault Sport, the engine was used by Equipe Renault Elf in Formula One from 1977 to 1985. This engine derived from the CH series designed by François Castaing, the F1 engine was developed by Bernard Dudot.
Renault's decision to use its 1500 cc V6 turbo engines in F1 was one of the boldest decisions ever taken in the sport. In nine full seasons competing against normally aspirated 3000 cc engines, they gave an excellent account of themselves, with:
- One World Championship Runner-Up title in 1983.
- 20 race wins (15 with Renault, 5 with Lotus).
- 50 pole positions (32 with Renault, 18 with Lotus).
- 51 podium finishes (25 with Renault, 20 with Lotus, six with Ligier).
Ultimately, as a result of their success, all F1 teams adopted turbo engines in the 1985 season.