The Mercedes-Benz M276 engine is a gasoline direct injection automotive piston V6 engine.
The M276 engine is not related to the Chrysler Pentastar engine except for the 60-degree angle, despite that it was developed while Chrysler was still owned by Daimler AG. This can be seen in its 60 degree veeâÂÂangle, as opposed to the 90-degree angle of its M272 predecessor. The 60 degree veeâÂÂangle eliminates the need for a balance shaft, improving refinement while reducing mechanical complexity. None of the parts are shared at all.
The M276 engine features an aluminum engine block with Nanoslide cylinder coating and dual overhead camshafts with independent variable valve timing on 12 intake and 12 exhaust valves and a new 2âÂÂstage timing chain arrangement. The M276 also includes direct injection with piezoâÂÂelectrically controlled injectors for 2 to 3 sprays per intake stroke in normal operation, multiâÂÂspark ignition that creates up to 4 sparks per cycle, and the demandâÂÂcontrolled fuel pump, water pump, oil pump and alternator that reduce parasitic loads.
The first spray of fuel injection creates the base lean burn mixture in the intake cycle, while the later spray(s), up to 4 more times in combustion cycle in difficult conditions for a clean burn, control when and where the ignition starts and how the burn propagates in stratified charge fashion. In combination with a new smaller and more efficient Variable Valve Timing mechanism on all 4 camshafts, the precise combustion control allows a quicker and smoother reâÂÂstart of the engine for the stopâÂÂstart system. This VVT can alter cam timing up to 40 crank degrees with a higher speed than before, and enables limiting the intake charge combined with a normal combustion stroke, thus making the operating process an Atkinson cycle in partial throttle conditions for better fuel efficiency. These features are also shared with Mercedes' M278 V8 engine, announced at the same time.
MercedesâÂÂBenz claims that the new engine, in conjunction with the demandâÂÂcontrolled ancillaries and the stopâÂÂstart system, can produce up to a 24% improvement in fuel economy while increasing power and torque over the M272. This efficiency improvement led to the various models with this engine being labeled with Blue Efficiency moniker.
Retaining most of the above characteristics, turbocharged smaller displacement DELA 30 variant was introduced in 2013 for C400 (W205) and subsequently offered on other models without the name Blue Efficiency.
For 2014 CLS400, a turbocharged larger displacement variant named DELA 35 came out to the market with a lower boost of compared to of DELA30 resulting in the same power and torque ratings at a lower fuel consumption.
In 2015, a higher boost and a slightly lower compression ratio (10.5:1) were used to create a DE30LA version for AMG models, and is used for many AMG and MercedesâÂÂBenz vehicles since.
Three variants of the naturally aspirated M276 DE 35 engine were produced in 2010âÂÂ2017 with a displacement of , bore and stroke of . Output of the first variant introduced on 2011 C350 BlueEfficiency with 12.2:1 compression ratio is at 6400 rpm with of torque at 3000âÂÂ5100 rpm.
Output of the second variant with 12.2:1 compression ratio is at 6500 rpm with of torque at 3500âÂÂ5250 rpm. S350, CLS350, ML350, E350, R350, C350 and GLK350 models received this higher output version from 2011 to 2015. S400h hybrid model used this engine from 2012 to 2017 in combination with an electric motor in between the engine and torque converter.
A detuned version of this engine was introduced on C300, and used also by E300 and S300 from model year 2013 to 2015, producing and of torque.
With a reduced bore and stroke at and reduced compression ratio at 10.7:1, DE 30 LA is turbocharged with twin IHI turbochargers for at 5,250âÂÂ6,000rpm and of torque at 1,600âÂÂ4,000rpm and weighs in at 179.2 kg DIN. This engine was introduced on 2013 C400(W205), and used for E400 Coupe 4Matic, ML(GLE)400 4Matic, E450 4Matic, CLS450, S450, S500e and other models.
For 2015âÂÂ2016, a higher output version is also offered with and on higher boost and 10.5:1 compression ratio for C450 AMG and GLE450 AMG. This engine powers 2017âÂÂon AMG SLC43, AMG C43 and AMG GLE43, as well as 2018âÂÂ2020 E450 4Matic, S560e and other models.
For 2018âÂÂ2021, another higher output version is offered with and on higher boost.
The same bore and stroke of the normally aspirated DE 35 () are used for this turbocharged version, with a lower boost level than the DE 30 LA on the same twin turbocharged format using a different model IHI turbocharger. While the power and torque remained the same, this larger displacement lower boost model yields a lower fuel consumption than the M276 DE 30 LA. Sometimes called DE 35 LA, this engine was offered on S400, CLS400, E400 4Matic (up to 2018) and Maybach S400 4Matic models up to 2017.