Mercedes-AMG GT Engine Specs Unmasked

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Compact Mercedes-AMG 4.0 litre Bi-Turbo V8 to produce 375kW

Mercedes-AMG had whet our appetites with the sound of the 4.0 litre twin-turbo V8 installed in the GT supercar, but now they have released technical details-in sum, the figures are as follows: four overhead cams, 32 valves, [email protected],250rpm and 650Nm from between 1750-4750rpm with a redline of a lofty (for a V8) 7,200rpm.

The new powerplant is referred to as the M178 within AMG, and the firm has fitted the two turbos inside the V-as opposed to the traditional method of fitting them on the outside of the V. This design is referred as the “Hot V.” Mercedes-AMG says by utilising this technique, they increase engine performance while reducing engine size and exhaust emissions.

Mercedes-AMG 4.0-Liter Biturbo-Motor (M 178); 2014

The M178 runs as dry sump and is therefore allowing the engine to be mounted lower in the engine bay and, total dry engine amounts to 209kg.

AMG also claims that the new V8 which has the exact displacement of 3982cc is related to the four-pot in the A45 AMG, GLA 45 AMG and the CLA 45 AMG as both engines share the same bore/stroke ratio, which Mercedes says contributes to the M178’s high rev limit.

Mercedes-AMG 4.0-Liter Biturbo-Motor (M 178); 2014

Active engine mounts are also installed (much like its rival the Porsche 911) to aid handling, a two-mass flywheel reduces vibration and an ECO start/stop function with alternator control help to keep fuel consumption in check.

As for the exhaust note, flaps in the exhaust system modulate the volume and aggression of the noise trumpeted out of the rear and this is dependent on how near or far the accelerator is in relation to the carpet in the driver’s footwell.

The engine will be handmade by one AMG craftsman and will undoubtedly be available in future AMG models.

The new AMG M178 V8 engine specifications:

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 (510 hp)
at 6250 rpm
Output per litre 94.2 kW/litre
128 hp/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


The founding father of The Motoring Guru, Matt has been a lifelong car enthusiast and a passionate writer. Back in 2013 when The Motoring Guru was first launched, Matt wanted to combine his two passions whilst offering readers sound motoring advice.