McLaren M840T engine

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
ManufacturerMcLaren & Ricardo PLC
DesignerTom Walkinshaw Racing
Production2017-present
Layout
Configuration90° flat-plane V8
Displacement4.0 L (3,994 cc)
Cylinder bore93 mm (3.66 in)
Piston stroke73.5 mm (2.89 in)
Valvetrain32-valve (4 valves x cyl.), DOHC
RPM range
Max. engine speed8500
Combustion
TurbochargerMHI Twin-turbo with intercooler
Fuel systemMulti-point electronic indirect fuel injection
Fuel typeUnleaded petrol + Ethanol (both blends may vary) by BP Ultimate (2017-2020) later Gulf Pro Fuels (2021-present)
Oil systemDry sump. Castrol EDGE Supercar (2017-2020) later Gulf Formula Elite 5W-40 fully-synthetic motor oil (2021-present)
Cooling systemWater-cooled
Output
Power output612–814 bhp (620–825 PS; 456–607 kW)[1]
Torque output465–590 lb⋅ft (630–800 N⋅m)
Dimensions
Dry weight170 kg (375 lb)
Chronology
PredecessorMcLaren M838T

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–present M840T 720 PS (530 kW; 710 bhp)
@ 7500 rpm		 770 N⋅m (568 lb⋅ft)
@ 5500 rpm
720S GT32018–present -
720S GT3X2021–present -
765LT2020–present 765 PS (563 kW; 755 bhp)
@ 7500 rpm		 800 N⋅m (590 lb⋅ft)
@ 5500rpm
750S 2023– 750 PS (740 bhp) -
Senna 2018–present M840TR 800 PS (588 kW; 789 bhp)
@ 7250 rpm		 800 N⋅m (590 lb⋅ft)
@ 5500rpm
Senna GTR 2019–present 825 PS (607 kW; 814 bhp)
Senna GTR LM 2020–present 845 PS (621 kW; 833 bhp)
Elva 2020–present 815 PS (599 kW; 804 bhp)
Speedtail 2020–present 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–present M840TE 620 PS (456 kW; 612 bhp)
@ 7500 rpm		 630 N⋅m (465 lb⋅ft)
@ 5500 rpm

References
  1. "McLaren Speedtail finally reveals its hybrid powertrain secrets".
  2. "McLaren M840T 4.0-Liter V8 Engine | First Details, Specs, News". 15 February 2017.
  3. "Engines on Test: McLaren 720S 4.0-liter V8". 5 March 2020.
  4. "McLaren Confirms 4.0-liter Twin-Turbo V8 (M840T) for 720S". 15 February 2017.
  5. "This 20-Year-Old Nissan is the Origin of All of McLaren's Modern V8s". 10 March 2017.
  6. "2017 McLaren 720S 4.0 V8 (720 Hp) SSG | Technical specs, data, fuel consumption, Dimensions".
  7. "2017 McLaren 720S". 31 July 2017.
  8. "McLaren 720S". Retrieved 4 November 2022.
  9. Orlove, Raphael (10 March 2017). "This 20-Year-Old Nissan Is The Origin of All of McLaren's Modern V8s". jalopnik.com. Retrieved 28 September 2018.
  10. "At the Heart of Every McLaren is a Nissan". 22 May 2021.
  11. "McLaren Speedtail Technical Specs, Dimensions".
  12. "2017 McLaren 720S specifications | technical data | performance | fuel economy | emissions | dimensions | horsepower | torque | weight".
  13. "McLaren MP4-12C First look". Edmunds.com. 13 October 2009.
  14. "The Official McLaren Automotive Website". 3 February 2010. Archived from the original on 1 October 2009. Retrieved 30 April 2011.
  15. "McLaren MP4-12C - the first official P11 story". 8 September 2009.
  16. "2018 17 19 20 McLaren 720S 720 OEM Turbo Turbochargers Left / Right #1420 A2". eBay. Retrieved 1 January 2022.
  17. "2018 17 19 20 McLaren 720S 720 OEM Turbo Turbochargers Left / Right". eBay. Retrieved 1 January 2022.
  18. "New Ricardo engine assembly facility commences pilot production". ricardo.com. 13 February 2011. Retrieved 19 February 2011.
  19. "McLaren 720S - Super Series". cars.mclaren.com. Retrieved 23 March 2017.
  20. MacKenzie, Agnus (3 May 2017). "2018 McLaren 720S First Drive: Teacher's Pet". Motor Trend. Retrieved 28 April 2019.
  21. "212mph McLaren 720S officially revealed at Geneva Motor Show". Autocar. 3 August 2017. Retrieved 8 March 2017.
  22. "McLaren Super Series - 720S - Specification". cars.mclaren.com. Retrieved 23 March 2017.
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