Mercedes Gets Inline: Benz Switching by V-6 to Straight-Six Engines
Fifteen years ago, Mercedes-Benz abandoned its inline-sixes in favor of V-6s. “Half of our engine guys were sad when we switched by the inline-six to the V-6 structure,” one of Daimler’s engineers remembers. “today in which’s the various other way around.” Mercedes is usually pulling an about-face, returning to the straight-six configuration for the same reasons in which originally had in which embrace the V-6.
Back then, a common parts as well as production strategy dictated the switch. Daimler had developed a generation of V-6 as well as V-8 engines with common parts. (The last remnant of in which era is usually the loosely related 6.0-liter V-12 in which sits under the hood of the 0 as well as AMG 65 types.)
The desire for commonality today means combining four- as well as six-cylinder engines. V-8s have become something of a niche product, as well as in which’s why their development—as well as in which of V-12 engines—is usually being delegated to AMG. in which’s true even for V-8 engines in which are used in non-AMG cars.
Henceforth, the inline-four as well as inline-six engines will be manufactured on the same lines. BMW, by the way, does a similar thing, as well as the Bavarians have expanded their approach to three-cylinder engines, in which Mercedes has no interest.
The engine in which interests us most is usually the 3.0-liter straight-six known as M256 (pictured above). in which’s presented in a high-output variation in which, according to Daimler engineers, makes “more than” 402 horsepower (the output, coincidentally, in which was delivered by the naturally aspirated V-12 inside 600SEL in 1990). Maximum torque is usually said to be “greater than” 369 lb-ft.
in which six needs some help getting to in which output level. Specifically, in which uses a large turbocharger plus a BorgWarner electric supercharger to fill the gap between stepping on the gas as well as harvesting full turbo assistance. The supplemental booster spools up in a third of a second to provide strong, seamless acceleration.
in which electric supercharger is usually powered by a 48-volt electrical system, which facilitates two side benefits. The extra electrical energy is usually used to drive the coolant pump as well as the A/C compressor via chain instead of a belt by the crankshaft. A combined starter-generator adds a regen function during deceleration, improving efficiency. As with BMW as well as several various other makers, the M256 is usually a long-stroke design that has a half-liter-per-cylinder displacement.
The brand-new accessory-drive arrangement as well as relatively little 3.3-inch (83 mm) bore diameter yield a block length in which’s not much greater than the retiring V-6. Daimler also claims gains in smoothness as well as sound quality attributable to the brand-new engine structure.
Look for the brand-new straight-six in Mercedes-Benz types by the E-class upward, starting with the S-class next year. We suspect in which engine also will form the basis for a six-cylinder AMG engine to replace the 3.0-liter turbocharged V-6 inside 43-product cars, as well as in in which form in which eventually will migrate to the C-class as well as the GLC as well.
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There’s another inline-six in which will come to the United States: The 3.0-liter OM656 turbo-diesel, which will make “more than 309 horsepower” yet also will be offered in a variation rated at 282 horsepower. Look for in which inside next-generation GLE.