The new Mercedes 5.5 liter V8 AMG engine image

A completely newly developed AMG 5.5-litre V8 biturbo engine with a peak output of up to 420 kW (544 to 571 hp) and maximum torque of up to 900 newton metres will enter the lineup in summer 2010. The new eight-cylinder unit known internally as the M 157 impresses with a wealth of technological highlights such as direct petrol injection with spray-guided combustion and twin turbochargers.

According to Daimer, the new S 63 AMG, in which the V8 biturbo will have its market debut, will consume only 10.5 litres per 100 kilometres. Is hard to believe that, but we are looking forward to see the users reviews with this new engine, which most likely will go into production in the summer of 2010.

This new engine comes with a new gearbox: the AMG SPEEDSHIFT MCT 7-speed sports transmission combines dynamism with economy, and includes a new start/stop function in the “Controlled Efficiency” driving mode.

Whilst the AMG 6.3 litre V8 naturally aspirated engine has a displacement of 6208 cc the new AMG 5.5-litre V8 biturbo unit makes do with 5461 cc. The use of direct injection technology results in a reduction of exactly 747 cubic centimetres and increases efficiency. For the first time, AMG is also utilising the advantages of direct petrol injection with spray-guided combustion and piezo-electric injectors. Other highlights include a crankcase wholly of aluminium, four-valve technology with adjustable camshafts, an air/water intercooler, generator management and a start/stop function as standard.

Engine production
Like all other AMG engines, the new eight-cylinder biturbo is assembled by hand in the AMG engine shop taken into commission in 2002. A single, highly-qualified technician assembles the M 157 according to the “one man, one engine” philosophy, maintaining the very strictest quality standards. This painstaking care is attested to by his signature on the characteristic AMG engine plate.

Key figures at a glance:*

AMG 5.5-litre V8 biturbo engine
Displacement 5461 cc
Bore x stroke 98.0 x 90.5 mm
Compression ratio 10.0:1
Output 400 kW (544 hp) at 5500 rpm

420 kW (571 hp) at 5500 rpm**

Max. torque 800 Nm at 2000-4500 rpm

900 Nm at 2500-3750 rpm**

at 2500-3750 rpm*

Engine weight (dry) 204 kg
Power/weight ratio 0.41 kg/hp

0.39 kg/hp**

* provisional figures; ** with AMG Performance package

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