McLaren M838T engine

The McLaren M838T engine is a 3798.6 cc 90-degree twin-turbocharged flat-plane V8, designed and developed in collaboration with Ricardo plc.

Development
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.

The engine is built at Ricardo's engine assembly facility in Shoreham-by-Sea, West Sussex. The turbochargers are supplied by Mitsubishi Heavy Industries (MHI), and are different units from those used in Mitsubishi Lancer Evolutions.

Applications
The engine was designed and built for the McLaren MP4-12C, where it produces 600 PS @ 7000 rpm and 600 Nm @ 3000 rpm of torque. In 2012 McLaren released an update increasing power to 625 PS @ 7500 rpm. For the GT3 racecar, the engine produces less power at only 500 PS.

The engine has a bore and stroke of 93x69.9 mm and a bore spacing of 108 mm.

McLaren and Ricardo redeveloped the M838T engine for use in the McLaren P1. The engine has been upgraded to optimise cooling and durability under higher loads. The engine block has also been modified to incorporate an integrated electric motor as part of a hybrid drive train. The petrol engine produces 727 bhp at 7,200 rpm with an additional 176 bhp from the electric motor. At 4,000 rpm the engine is said to produce 720 Nm of torque while the electric motor can produce a maximum of 260 Nm from 0 rpm upwards.