We haven’t seen the new, Porsche 911-rivaling Mercedes-AMG GT in the flesh yet, but Mercedes has unveiled the 4.0-litre, twin-turbo V8 engine that will power it.
The 3,982cc unit is closely related to the 2.0-litre turbo ‘four’ that powers the A45 AMG, sharing the same bore/stroke ratio. The two turbos are mounted inside the ‘V’, a first in a sportscar, and there is dry sump lubrication, so the AMG GT can corner on its door handles with the engine cutting out.
Ultra-hard, so-called Nanoslide cylinder liners allow very high pressures from the direct-injection and reduce friction, increasing both power and efficiency. An active exhaust with variable flaps brings the noise.
All this results in an engine that produces 503bhp and 479lb/ft of torque. Designated the M178, it should return a not-to-shabby 28.8mpg in the AMG GT, too.
As well as the Mercedes-AMG GT sports car, the M178 engine will likely also power the next AMG C-Class. The AMG GT will almost certainly be unveiled at the Paris Motor Show in October.