| BRM 255 BRM 258 BRM 259 | |
|---|---|
| Overview | |
| Manufacturer |  British Racing Motors |
| Production | 1956–1960 |
| Layout | |
| Configuration | L4 |
| Displacement | 2.5 L (153 cu in) |
| Cylinder bore | 4.05 in (103 mm) |
| Piston stroke | 2.95 in (75 mm) |
| Valvetrain | 8-valve, DOHC, two-valves per cylinder |
| Combustion | |
| Fuel system | Carburetor |
| Fuel type | Gasoline |
| Oil system | Dry sump |
| Output | |
| Power output | 260–285 hp (194–213 kW) |
| Torque output | 205 lb⋅ft (278 N⋅m) |
The BRM 4-cylinder engines are a series of four-stroke, naturally-aspirated, 2.5 L (150 cu in), inline-four Formula One racing engines, designed, developed and built by British Racing Motors, between 1956 and 1960. They were exclusively used by BRM; and powered the BRM team cars. It was constructed to conform the FIA engine requirements; necessitating a 2.5 L naturally-aspirated engine displacement formula. The power output for these motors were between 260–285 hp (194–213 kW), and 205 lb⋅ft (278 N⋅m).[1][2]