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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]
| McLaren M840T engine | |
|---|---|
| Overview | |
| Manufacturer | McLaren & Ricardo |
| 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 |
McLaren bought the intellectual property rights to the Tom Walkinshaw Racing developed engine, itself based on the Nissan VRH engine architecture,[9] which was designed for the IRL IndyCar Series but never raced. However, other than the 93 mm (3.66 in) bore and 73.5 mm (2.89 in) stroke, little of that engine remains in the M840T.[10][11][12]
Developed with help from Ricardo, the engine redlines at 8500 rpm, but 80% of the engine's torque is available as low as 2000 rpm.[13][14] McLaren claims that the engine has the highest horsepower to CO2 emission ratio of any current production engine.[15]
M840T engine uses double MHI turbochargers which names TD05H-06*20HF1T-12T.[16][17] Despite the name, these are not the same turbochargers which used in the Mitsubishi Lancer Evo IX (X).
The engine is built at Ricardo's engine assembly facility in Shoreham-by-Sea, West Sussex.[18]
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McLaren's new M840T engine debuted as an evolution of the M838T used in the 650S.[19] It is a 3,994 cc (4.0 L; 243.7 cu in) twin-turbocharged V8 engine. However, the stroke has been lengthened by 3.6 mm to increase the capacity and 41% of the engine's components are new. The engine uses new twin-scroll turbochargers which have a low inertia titanium-aluminium turbines which spin with maximum efficiency with the help of actively controlled waste gates.[20][21] The engine in the 720S was rated at a power output of 720 PS (530 kW; 710 hp) at 7,500 rpm, giving the car its name; the maximum torque is 568 lb⋅ft (770 N⋅m) at 5,500 rpm.[22]
| Models | Years | Codename | Power | Torque |
|---|---|---|---|---|
| 720S | 2017–2023 | M840T | 720 PS (530 kW; 710 bhp) @ 7500 rpm |
770 N⋅m (568 lb⋅ft) @ 5500 rpm |
| 720S GT3 | 2018–2022 | - | ||
| 720S GT3X | 2021–2022 | - | ||
| 765LT | 2020–2023 | 765 PS (563 kW; 755 bhp) @ 7500 rpm |
800 N⋅m (590 lb⋅ft) @ 5500rpm | |
| 750S | 2023– | 750 PS (740 bhp) | 800 N⋅m (590 lb⋅ft) @ 5500rpm | |
| Senna | 2018–2020 | M840TR | 800 PS (588 kW; 789 bhp) @ 7250 rpm |
800 N⋅m (590 lb⋅ft) @ 5500rpm |
| Senna GTR | 2019–2020 | 825 PS (607 kW; 814 bhp) | ||
| Senna GTR LM | 2020 | 845 PS (621 kW; 833 bhp) | ||
| Elva | 2020 | 815 PS (599 kW; 804 bhp) | ||
| Speedtail | 2020 | M840T | 756 PS (556 kW; 746 bhp) Electric: 312 PS (229 kW; 308 bhp) Total: 1,050 PS (770 kW; 1,040 bhp) |
800 N⋅m (590 lb⋅ft) Electric: 350 N⋅m (258 lb⋅ft) Total: 1,150 N⋅m (848 lb⋅ft) |
| GT | 2019–2024 | M840TE | 620 PS (456 kW; 612 bhp) @ 7500 rpm |
630 N⋅m (465 lb⋅ft) @ 5500 rpm |
| GTS | 2024– | M840TE | 635 PS (467 kW; 626 bhp) @ 7500 rpm |
630 N⋅m (465 lb⋅ft) @ 5500 rpm |
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