The McLaren M840T engine is a , 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.
Development McLaren bought the intellectual property rights to the Tom Walkinshaw Racing developed engine, itself based on the Nissan VRH engine architecture, which was designed for the IRL IndyCar Series but never raced. However, other than the bore and stroke, little of that engine remains in the M840T.
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. McLaren claims that the engine has the highest horsepower to emission ratio of any current production engine.
M840T engine uses double MHI turbochargers named TD05H-06*20HF1T-12T. Despite the name, these are not the same turbochargers which are used in the Mitsubishi Lancer Evo IX (X).
The engine is built at Ricardo's engine assembly facility in Shoreham-by-Sea, West Sussex.
Applications McLaren's new M840T engine debuted as an evolution of the M838T used in the 650S. It is a 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. The engine in the 720S was rated at a power output of at 7,500 rpm, giving the car its name; the maximum torque is at 5,500 rpm.
ModelsYearsCodenamePowerTorque720S2017–2023M840T@ 7500 rpm@ 5500 rpm720S GT32018–2022 -720S GT3X2021–2022 -765LT2020–2023@ 7500 rpm@ 5500rpm750S 2023–750 PS (740 bhp) @ 5500rpmSenna2018–2020M840TR@ 7250 rpm@ 5500rpmSenna GTR2019–2020Senna GTR LM2020Elva2020Speedtail2020M840TElectric: Total: Electric: Total: GT2019–2024M840TE@ 7500 rpm@ 5500 rpmGTS2024–M840TE@ 7500 rpm@ 5500 rpm
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