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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:

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