M276 V6 

This is a bit confusing and BenzBoost is not sure what Mercedes is doing or why they quietly introduced a new turbo M276 V6 variant without any fanfare. The new 400 models were all supposed to get the new M276 DELA 30 turbo V6. As it turns out, some of these models have an M276 DELA 35 turbo V6 which has the exact same 333 horsepower and 354 lb-ft of torque although with 3.5 liters of displacement instead of 3.0 liters.

Why the 3.5 liter variant? Mercedes has not said why. Initially everyone thought it was simply a typo but there are in fact two M276 DELA turbo motors. The 3.5 liter unit makes the same horsepower and torque but with much less boost. The DELA 35 pushes 10.2 psi to make the 333 horsepower whereas the 3.0 liter unit has a very high 26.1 psi of boost.

This means of course that the DELA 35 motor is the better tuning choice with far more headroom especially on pump gas. This raises a big question regarding the upcoming 2015 W205 C450 sport model. That model is expected to get a boost to 367 horsepower so is Mercedes further raising the boost on the 3.0 liter unit already pushing 26.1 psi from the factory or giving that model the 3.5 liter variant with a little more boost? The latter makes far more sense and makes the C450 far more appealing.

We will have to wait and see exactly what happens and if Mercedes offers any explanation but the C400 models use the M276 DELA 30 V6 whereas the facelifted CLS400 uses the M276 DELA 35 V6 which makes sense for the larger and heavier car. The E400 model though uses the 3.0 liter variant and we have no explanation for the inconsistency.
The M276 DELA 35 of the CLS 400 (218361) in the model refinement, model year 2015:

3,498 cm3
Rated torque at 1200-4000 480 u / min
92.9 mm bore
86.0 mm stroke
Compression ratio 10.5: 1
Mixture formation process gasoline direct injection and shifts
V-angle in degrees: 60.0
Charging pressure at full load in bar: 0.70
Consumption: 10.0 liters / 100 km urban, 5.7 l / 100 km on the highway, 7.3l / 100 combined
CO2 Emissions: 169-170 g / km
Maximum driving performance in the aisles 1-7: 65/99/148/209/250/250/250

The M276 DELA 30 400 (212065) in model year 2014:

2.996 cm3
Rated torque at 1600-4000 480 u / min
88.0 mm bore
82.1 mm stroke
Compression ratio 10.5: 1
Mixture formation process gasoline direct injection and homogeneous operation
V-angle in degrees: 60.0
Charging pressure at full load in bar: 1.80
Usage: 10.4-10.8l / 100 in town, 5.8-6.2l / 100 km on the highway, 7.5-7.9l / 100 combined
CO2 Emissions: 175-185 g / km
Maximum driving performance in the aisles 1-7: 65, 100, 150,212,250,250,250

This article was originally published in forum thread: Mercedes introduces a new 3.5 liter M276 turbo variant with the same horsepower and torque - M276 DELA 35 V6, 333 horsepower 354 lb-ft of torque started by Sticky View original post