The Mercedes-BenzM275 engine is a twin-turbocharged and intercooled, all-aluminium, 60° V12automobilepiston engine family used in the 2000s to the 2010s. It is loosely based on the M137naturally aspirated V12 sold between 1998 and 2002, and retains its SOHC, 3 valves 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. Several variations of the M275 V12 Bi-turbo engine have powered many top-of-the-range Mercedes-Benz and Maybach models since 2003.
M275
Bore and stroke is giving a displacement of. Power output ranges from to at 5000 rpm and to of torque at 1800–3500 rpm. Applications:
The M275 AMG is a version, with boost pressure reaching at maximum, and uses air-to-liquid intercoolers. Bore and stroke are increased to. Output is at 4800–5100 rpm with 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 at 4800–5400 rpm and of torque at 2200–4200 rpm. However, due to the torque abundance to power the rear wheels, the SL65 Black is still limited to. Applications:
The M285 is a version built in Stuttgart, Germany built specifically for Maybach badged products. Bore and stroke is. Output is at 5250 rpm with of torque at 2300-3000 rpm. The cylinders are lined with silicon/aluminium, and uses fracture-split forged steelconnecting rods. Applications:
The M158 is a version based on the M275. The engine uses smaller twin scroll type turbos, a bespoke BoschECU, a modified intercooler configuration, and dry sump lubrication. It produces at 5800 rpm and of torque at 2250-4500 rpm. AMG builds this engine specifically for Pagani Automobili for use in the Huayrasupercar. Later in BC model, M158 makes and. The Imola variant of the Huayra uses a version of the M158 producing and. The engine is mated to a new 7-speed electrohydraulic automated manual gearbox designed and built by XTrac. Applications:
In 2012, Mercedes-Benz delivered all the rights of V12 engine development to AMG for future V12-model vehicles. 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, the new engine has enough modifications and sporting character 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 - 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. With these modifications and the addition of Mercedes-Benz's 7G-Tronic transmission on the V12 models, estimations are that fuel economy with rise around 21% on the European cycle for the large-bodied Mercedes vehicles. Power is now at and torque figures stay the same as the predecessor at. Applications:
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 and still 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 lighter as a result of a reduction in the wall thickness. Applications:
