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.
[2][3][4][5][6][7][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.
[16][17] Despite the name, these are not the same turbochargers which used in the Mitsubishi Lancer Evo IX (X).
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.