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We’ve known for some time that Mercedes-Benz was going to be downsizing for the upcoming AMG GT and C63 AMG’s engine. It was even widely known that the engine would be a 4.0-litre biturbo V8 unit, but details on the power plant were scarce, until now…
Mercedes-Benz has revealed the full details of the M178 engine, with specifications for the upcoming AMG GT supercar. So, what are the figures like? How does 375kW and 650Nm sound? We reckon that should be plenty potent enough to give the Porsche 911 a fright when the AMG GT arrives.
Technical highlights of the M178 engine include some very Audi-esque turbo positioning, by placing the turbochargers inside the 90° V to reduce turbo-lag and increase throttle response. Dry sump lubrication means the engine can be installed lower for a better centre of gravity, and optimal handling. The engine, in keeping with the tradition of the old M156 unit, is light weight, weighing only 209Kg.
All models featuring this engine will be equipped as standard with a variable sports exhaust system in order to retain that typically AMG exhaust note. Other standard features mated to the engine include ECO stop/start function and active engine mounts.
Full technical specifications of the engine can be seen in the table below:
| Cylinder arrangement | V8 |
| Cylinder angle | 90° |
| Valves per cylinder | 4 |
| Displacement | 3982 cc |
| Bore x stroke | 83.0 x 92.0 mm |
| Cylinder spacing | 90 mm |
| Compression ratio | 10.5 : 1 |
| Output | 375 kW at 6250 rpm |
| Output per litre | 94.2 kW/litre |
| Max. torque | 650 Nm at 1750 – 4750 rpm |
| Torque per litre | 163.2 Nm/litre |
| Maximum engine speed | 7200 rpm |
| Maximum charge pressure | 1.2 bar |
| Peak pressure | 130 bar |
| Engine weight (dry) | 209 kg |
| Emissions standard | Euro 6 |
But how does the M178 sound? The video below should be a good enough indication:
