McLaren M840T engine

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McLaren M840T engine
Overview
Manufacturer McLaren & Ricardo PLC
Production 2017-present
Combustion chamber
Configuration 90° flat-plane V8
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Cylinder bore 93 mm (3.66 in)
Piston stroke 73.5 mm (2.89 in)
Valvetrain 32-valve (4 valves x cyl.), DOHC
Combustion
Turbocharger MHI Twin-turbo 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

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]

Development

McLaren bought the rights to the Tom Walkinshaw Racing developed engine, itself based on the Nissan VRH engine architecture,[9] which was designed for the IRL Indycar championship but never raced. However, other than the 96.6 mm (3.80 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]

Applications

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) -
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– M840TE 620 PS (456 kW; 612 bhp)
@ 7500 rpm		 630 N⋅m (465 lb⋅ft)
@ 5500 rpm

References

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External links

McLaren Automotive road car timeline, 1990s–present
Type 1990s 2000s 2010s
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
Sports Series 540C
570S
Super Series 625C
12C 650S
675LT
Ultimate Series F1 Mercedes-Benz SLR McLaren P1
F1 LM
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