| McLaren M840T engine | |
|---|---|
| Overview | |
| Manufacturer | McLaren & Ricardo PLC |
| Designer | Tom Walkinshaw Racing |
| Production | 2017-present |
| Layout | |
| Configuration | 90° flat-plane V8 |
| Displacement | 3,994 cc (243.7 cu in) |
| Cylinder bore | 93 mm (3.66 in) |
| Piston stroke | 73.5 mm (2.89 in) |
| Valvetrain | 32-valve (4 valves x cyl.), DOHC |
| RPM range | |
| Max. engine speed | 8,500 |
| Combustion | |
| Turbocharger | MHI twin-turbo that produced over 1.3 bar (18.85 psi) of turbo boosting pressure with intercooler |
| Fuel system | Multi-point electronic indirect fuel injection |
| Fuel type | Unleaded petrol + Ethanol (both blends may vary) by BP Ultimate (2017-2020) later Gulf Pro/Endurance Fuels (2021-present) |
| Oil system | Dry sump. Castrol EDGE Supercar (2017-2020) later Gulf Formula Elite 5W-40 fully-synthetic motor oil (2021-present) |
| Cooling system | Water-cooled |
| Output | |
| Power output | 612–814 bhp (620–825 PS; 456–607 kW)[1] |
| Torque output | 465–590 lb⋅ft (630–800 N⋅m) |
| Dimensions | |
| Dry weight | 170 kg (375 lb) |
| Chronology | |
| Predecessor | McLaren M838T |
| Successor | McLaren MHP-8 |
The McLaren M840T engine is a 4.0 L (244.1 cu in), 90-degree, twin-turbocharged, flat-plane V8 petrol engine, designed, developed and produced by McLaren, in partnership and collaboration with Ricardo, and introduced with their 720S sports car model, in 2017. It is an evolution of the M838T engine, introduced in 2011.[2][3][4][5][6][7][8]