Mercedes M278 Petrol Engine Manuals
The Mercedes-Benz M278 90° V8 petrol engine is offered in two displacements of 4.7 L; 284.6 cu in (4,663 cc) and 5.5 L; 333.3 cu in (5,461 cc) produced from 2011-
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Download: M278 Engine Introduction Into Service
Mercedes Benz M276 Engine Introduction
Overview Manual: Describes engine components, operation, specs
Application: M276, M278 DE and KE Variants
Download: 30.5 mb, 85 pages, Format: .pdf
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M278 Engine Technical Data
The Mercedes-Benz M278 is a family of direct injected, Twin-turbocharged, V8 gasoline automotive engines derived from the company's previous M273 V8 engine. The M278 features twin turbochargers, one per cylinder bank, producing 0.9 bar (13 psi) boost pressure in most configurations, and gasoline direct injection, with piezo-electrically actuated fuel injectors for more precise fuel delivery, along with multi-spark ignition that fired multiple times over the combustion sequence for more efficiency.
Other changes relative to the M273 include an increased adjustment range for the variable valve timing system, a new timing chain arrangement, and new engine accessories (such as the oil pump, water pump, fuel pump, and alternator) which reduce parasitic loads. Many of these new features are shared with the M276 V6 engine family, which was announced at the same time.
Mercedes-Benz estimate that these changes, in conjunction with vehicle modifications such as a stop-start system, allow the 4.6-litre M278 to have 22% lower fuel consumption and CO2 emissions than the 5.5-litre M273 while producing more power 320 kW (435 PS; 429 bhp) versus 285 kW (387 PS; 382 bhp) and torque 700 Nm (516 lb-ft) versus 530 Nm (391 lb-ft). The M278 is also more refined than its predecessor.
Specifications
The basic M278 displacement is 4,663 cc (4.7 L; 284.6 cu in), bore and stroke 92.9 mm × 86 mm (3.66 in × 3.39 in). Output is 320 kW (429 bhp; 435 PS) at 5,250 rpm with 700 Nm (516 lb-ft) torque at 1,800-3,500 rpm for S-Class, CL-Class, SL-Class, and GL-Class.
CLS-Class, E-Class, and M-Class models are derated to 300 kW (402 bhp; 408 PS) with 600 Nm (443 lb-ft) of torque at 1,600 rpm. Although it no longer corresponds with the engine displacement, all of the above models are still badged as "550". The GL-Class, besides the GL550 above, also features the GL450 trim that carries a detuned version of the 4.6 L engine making 270 kW (362 bhp; 367 PS) and 550 Nm (406 lb-ft). For 2014, S-Class models (Series W222) power is increased to 335 kW (449 bhp; 455 PS) at 5,250 rpm, torque remains at 700 Nm (516 lb-ft) between 1,800-3,500 rpm.
- Production 2010-
- Configuration 90° V8
- Displacement 4.7 L; 284.6 cu in (4,663 cc)
- 5.5 L; 333.3 cu in (5,461 cc)
- Cylinder bore 92.9 mm (3.66 in)
- 98 mm (3.86 in)
- Piston stroke 86 mm (3.39 in)
- 90.5 mm (3.56 in)
- Valvetrain DOHC 4 valves x cyl. with VVT
- Turbocharger Honeywell Twin-turbo's
- Power output 300-430 kW (408-585 PS; 402-577 bhp)
- Torque output 540-900 Nm (398-664 lb-ft)
Applications
These engines are mated to the 7G-Tronic 7-speed automatic transmission, and the new 9G-Tronic 9-speed automatic transmission.
- 2011-2017 S-Class (S500 in Europe, S550 in the US)
- 2011-2014 CL-Class (CL500 in Europe, CL550 in the US)
- 2015-2017 S-Class Coupe/Cabriolet (S500 in Europe, S550 in US)
- 2011-2018 CLS-Class (CLS500 in Europe, CLS550 in the US)
- 2012- SL-Class (SL500 in Europe, SL550 in the US)
- 2012-2014 E-Class (E500 in Europe, E550 in the US)
- 2012-2014 M-Class/GLE-Class (ML500/GLE500 in Europe, ML550 in US)
- 2013-2014 GL-Class (GL450 in Europe and US)
- 2013- GL-Class/GLS-Class (GL500/GLS500 in Europe, GL550/GLS550 in the US)
M278 Engine Resources
