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Old 08-07-2014, 08:05 PM   #1
AVANTI R5
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Default Mercedes-AMG is revving up its upcoming, twin-turbocharged 4.0-liter V-8,

Mercedes-AMG is revving up its upcoming, twin-turbocharged 4.0-liter V-8, which carries the internal code name M178. (Read our deep dive on the engine here.) Officially, the company has thus far only confirmed its use in the AMG GT sports car. But it will be installed in a whole range of AMG vehicles, serving as the replacement for both the M156/M159 naturally aspirated 6.2-liter V-8 and—eventually—the M157 twin-turbocharged 5.5-liter V-8.

In the AMG sports car, the M178 will power both the launch GTS (503 horsepower)—which we rode in last month—and the basic GT to come later (about 475 horsepower). But the GT is only the beginning for the new powerhouse and its variants, as it will be fitted in the next C63 AMG sedan and coupe. We should see at least the C63 sedan later this year before it arrives here in the fall of 2015. Around that same time, we have learned that Mercedes will launch an AMG version of the next-gen GLK powered by the same engine. And the M178 will appear in the next-generation E63 AMG in three years or so.

Eventually, almost every AMG model that’s based on a rear-wheel-drive platform will use the new engine, which includes the S63 AMG and the ML63 AMG. One of the main reasons is that the M178’s 4.0-liter size is advantageous for tax considerations in some global markets. It is for this same reason that Audi’s twin-turbo V-8 features the same displacement.

The exceptions, of course, are AMG’s front-drive-based models, which include the CLA45 and the GLA45; they’re powered by the M133 2.0-liter four-cylinder, which could be considered “half” of an M178. Of course, the twin-turboed M275/M279 V-12 will continue


Forgetting for a moment our unending grief regarding the death of the naturally aspirated 6.2, the proliferation of the M178 is a good thing. It’s a compact and powerful engine with dry-sump lubrication and its turbochargers nestled inside the cylinder banks in an efficient—and Benz first—“hot-V” configuration. Features like its “Nanoslide” cylinder-bore surfacing (essentially a thin, porous coating of iron) and forged-aluminum pistons allow for high peak turbo pressure and a lofty 7000-rpm redline. See, we told you the engine was getting revved up.
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Old 08-08-2014, 04:42 PM   #2
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Yup, first thing I thought of was the 4.0TT V8 Audi has been putting in all their cars the past couple years. I have no idea what that "hot-V" thing is engineering-wise, but it sounds cool and I'm sure AMG wouldn't put out a **** engine.
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Old 08-08-2014, 05:22 PM   #3
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I have no idea what that "hot-V" thing is engineering-wise
Turbos sit in between the banks of the cylinders - inside the V.
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Old 08-08-2014, 05:31 PM   #4
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I think BMW has done it on a couple of their engines, and it was done on a few diesels before that. It's really pretty smart, because you have nice, short manifolds, even if you optimize cylinder pairing between banks.
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Old 08-08-2014, 05:37 PM   #5
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Originally Posted by OrbitalEllipses View Post
Turbos sit in between the banks of the cylinders - inside the V.
Holy sweet... that sounds like one of the most frustrating things to work on as a mechanic.
I may be wrong, but dear god does it sound bad.


Regardless of that, the engine's specs do seem quite impressive.
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Old 08-08-2014, 05:47 PM   #6
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Holy sweet... that sounds like one of the most frustrating things to work on as a mechanic.
I may be wrong, but dear god does it sound bad.


Regardless of that, the engine's specs do seem quite impressive.
If anything it should be easier. Turbos/ manifolds etc... unbolt as one piece and lift off, intake manifolds would be on the outside of the engine so easier access to injectors etc......















But it was engineered by zee Germans, I'm sure they'll figure out some way to make it a PITA
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Old 08-08-2014, 05:53 PM   #7
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Turbos sit in between the banks of the cylinders - inside the V.

Sorry I meant more what the benefits would be. I get the shorter piping, but what about the cold side of the turbo? Can't be very cool right in there.
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Old 08-08-2014, 06:12 PM   #8
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The compressor still gets cooled by charge air, and you can hang air-water intercoolers over either side of the engine, in between the compressor outlet and the intake manifold. That's how BMW did it on the S63 V8.
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Old 08-08-2014, 07:03 PM   #9
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Sorry I meant more what the benefits would be. I get the shorter piping, but what about the cold side of the turbo? Can't be very cool right in there.
Intercoolers, same as any tuned turbo car. Bonus is the intakes are now further from the exhaust manifolds and less susceptible to radiant heat.
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Old 08-08-2014, 09:36 PM   #10
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Any chance 4Matic will be optional on next gen C63 AMG?
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