| Cosworth GMA | |
|---|---|
| Overview | |
| Manufacturer | Cosworth |
| Production | 2020–present |
| Layout | |
| Configuration | V12, naturally-aspirated, 65° cylinder angle |
| Displacement | 3,994 cc (4.0 L; 243.7 cu in) |
| Cylinder bore | 81.5 mm (3.21 in) |
| Piston stroke | 63.8 mm (2.51 in) |
| Cylinder block material | Aluminum alloy |
| Cylinder head material | Aluminum alloy |
| Valvetrain | DOHC, four-valves per cylinder |
| Compression ratio | 14:1 |
| Combustion | |
| Fuel system | Direct fuel injection |
| Oil system | Dry sump |
| Cooling system | water-cooled – twin-aluminium front radiators |
| Output | |
| Power output | 607–725 hp (453–541 kW) |
| Torque output | 320–358 lb⋅ft (434–485 N⋅m) |
| Dimensions | |
| Dry weight | 162–178 kg (357.1–392.4 lb) |
The GMA is a 4.0-litre, naturally aspirated V12 engine, commissioned by Gordon Murray, and developed and produced by Cosworth for the Gordon Murray Automotive T.50 & T.33 sports cars. The road-going engine is rated at 663 PS (488 kW; 654 hp) at 11,500 rpm, with a max torque figure of 467 N⋅m (344 lbf⋅ft) at 9,000 rpm,[1] making it the highest revving road car engine ever produced.[2] The engine is also more powerful than the 6.1 L (6,064 cc) S70/2 V12 engine used in the McLaren F1.