Mercedes-Benz M275 engine

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Several variations of the M275 V12 Bi-turbo engine have powered many top-of-the-range Mercedes-Benz and Maybach models since 2003

The Mercedes-Benz M275 (and similar M285) engine is a twin-turbocharged and intercooled, all-aluminum, 60° V12 automobile piston engine family used in the 2000s. It is loosely based on the M137 naturally aspirated V12 sold between 1998 and 2002, and retains its SOHC, 3 valve per cylinder, twin-spark ignition layout, but differs with the addition of structural reinforcements to the engine block for improved rigidity which in turn yields greater reliability. Bore is 82 mm and stroke is 87 mm giving a displacement of 5.5 L (5513 cc). Output is 510 hp (380 kW) at 5000 rpm with 612 ft.lbf (830 Nm) of torque at 1800–3500 rpm.


M275 AMG[edit]

The M275 AMG is a 6.0 L (5980 cm³) version, with boost pressure reaching 22.1 psi (1.52bar) at maximum, and uses air-to-liquid intercoolers. Bore is 82.6 mm and stroke is increased to 93 mm. Output is 604 hp (450 kW) at 4800–5100 rpm with 738 ft·lbf (1000 N·m) of torque at 2000–4000 rpm. It uses an ECI ignition system for the two spark plugs per cylinder, which helps with combustion and to support Ionic current measurement function sequence. The top of the range variant fitted in the SL65 AMG Black Series, which is equipped with 12% larger turbochargers, generates 670 PS (493 kW; 661 hp) at 4800–5400 rpm and 1,200 N⋅m (890 lb⋅ft) of torque at 2200–4200 rpm. However, due to the torque abundance to power the rear wheels, the SL65 Black is still limited to 1,000 N⋅m (740 lb⋅ft).



The M285 is a 5.5 L (5513 cc) version built in Stuttgart, Germany built specifically for Maybach badged products. Bore is 82 mm and stroke is 87 mm. Output is 543 hp (410 kW) at 5250 rpm with 664 ft.lbf (900 Nm) of torque at 2300-3000 rpm. The cylinders are lined with silicon/aluminum, and uses fracture-split forged steel connecting rods.



The M158 is a 6.0 L (5980 cc) version based on the M275. The engine uses smaller twin scroll type turbos (for reduced turbo-lag), a bespoke Bosch ECU, a modified intercooler configuration, and dry sump lubrication. It produces 730 PS (537 kW; 720 hp)[1] and 1,000 N⋅m (740 lb⋅ft) of torque.[1] AMG builds this engine specifically for Pagani Automobili for use in the Huayra supercar. Later in BC model, M158 makes 800 PS (588 kW; 789 hp) and 1,100 N⋅m (810 lb⋅ft). The engine mated to a new 7-speed electrohydraulic automated manual gearbox designed and built by XTrac.



In 2012, Mercedes-Benz delivered all the rights of V12 engine development to AMG for future V12-model vehicles.[2] Starting the 2014 model year, M277 has been extensively redesigned and updated their top of the range V12 engine to better conform to increasing emission standards in Europe and the United States. Despite the basic design being more than 16 years old (M137), the new engine has enough modifications and sporting personality that the engineers felt it warranted a new engine designation. According to Mercedes-Benz, the most important features of the new engine are:

- Increased displacement to 6.0 Liters (5980 cc)
- New forged pistons and forged crankshaft in high-grade quenched, tempered steel
- New Engine Control Unit
- New Ignition system
- New Camshafts
- Hollow-stem sodium outlet valves
- Low-temperature cooling-water circulation system with separate expansion reservoir.[3]

With these modifications and the addition of Mercedes-Benz's 7G-Tronic on the V12 models, estimations are that fuel economy with rise around 21% on the European cycle for the big body Benz . Power is now at 530 PS (390 kW; 523 hp) and torque figures stay the same at 830 N⋅m (610 lb⋅ft) over the predecessor.


M279 AMG[edit]

The M279 AMG is based on the new and comprehensively revised M277 engine series, specially tuned for AMG 65 and Maybach 650 models. In addition to that engine's updates from the previous M275, M279 utilizes new turbochargers with an increased spiral cross-section, new exhaust manifolds, new wastegate ducts, and new cylinder heads with optimized flow characteristics to increase the engine output to 630 PS (463 kW; 621 hp) and still 1,000 N⋅m (740 lb⋅ft) of torque. The multi-spark ignition with twelve double ignition coils and a new higher performing engine management system not only results in smoother running, but also enables even more effective combustion. The resulting reduction in exhaust emissions is also due to a large extent to the optimized catalytic converter system. The newly developed AMG sports exhaust system, which has a pipe layout with enhanced flow characteristics and only equipped in the AMG models, is 3.2 kilograms lighter as a result of a reduction in the wall thickness.


See also[edit]