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5.7K views 11 replies 5 participants last post by  cowboyt  
#1 ·
Hello all
I just received my '19 s650 last night
All I'll say is wow
Going thru the comfort sport and curve options
I'm leaning towards the v12 being a unsigned version on the AMG
Image
Image
 
#4 ·
Makes me wonder what the difference is between the M277 and M279 engines. They're both 6.0L twin-turbo V12's.

And yeah, OP, that's a nice looking motorcar there. More pics, please, if you can.
 
owns 2003 Mercedes-Benz S600
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#5 ·
Let me start off with adding praise and congratulations to the OP of this thread for the new acquisition! It is a beautiful car!
Now that you've teased us with the front...more pics are warranted! :p
Sigh...is it just me or does the vertical slats on the Maybach grille still not work as well as the horizontal slats of the traditional Mercedes grille?
I hoped that it would grow on me when I first saw it on the original Maybachs (57/62) but while it has some, it still doesn't feel completely right.
OTOH, the vertical slat grille is a necessary point to better differentiate the Mercedes-Maybach S from a regular S...so that is there.

@coyboyt
Both the M277 and the M279 are modified versions of the older M275 which is loosely based on the naturally aspirated M137. Both retain the single overhead cam and 3-valve per cylinder configuration.
The M277 was enough of a change to the M275 that it got its own internal designation code.
Among the changes were an all-aluminium crankcase, forged crankshaft, forged pistons, and a new ECU.
The M279 followed by adding port injection, larger redesigned turbochargers, changes to the drivetrain timing, a new exhaust system, and, probably, a new ECU.
Not surprisingly, the differences in their output:
M277 : 390 kW (530 PS; 523 hp) and 830 Nâ‹…m (612 lbfâ‹…ft)
M279 : 463 kW (630 PS; 621 hp) and 1,000 Nâ‹…m (738 lbfâ‹…ft)

Mercedes has some really impressive V12 engines. I would love to own one ... unfortunately, my penchant (and until recently, a necessity) for AWD means that I have been restricted to V8 engines. Initially, it was a design decision to not offer 4MATIC on their V12 models, but recently, it seems to be concern about long term reliability. Mercedes didn't feel comfortable with their transmissions handling the torque of their V12s. I hear the upcoming generation V12 Mercedes' might come with 4MATIC and that has me excited. I can't wait to see the V223 S65 and the X223 S680.
After all...this may be the last generation of Mercedes V12 engine vehicles offered. outside of possible specialty and/or limited editions. I think future "top shelf" Mercedes models might drop down to hybridized V8s.
 
#9 ·
Yes, the component in question is the Y77/1 Boost pressure control transducer.
The yellow connection is vent to air, and should thus be open.
Purpose is to not let the boost pressure build up too high.

There is a slightly better explanation of the same component, in the M257 and M285 documents. There, the same component is
called Y31/5, and has a different location (on those, the area in the middle of the V is occupied with the voltage power supply).


br,
syljua
 
#12 ·
So, it appears to me that the M277 is essentially the “new M275 5.5L”, and the M279 is the “new M275 6.0L AMG”. This makes sense economically; the V12 is a niche market, so it’s better to just use the same engine block for both applications. Also, the larger displacement of the M277, while developing the same power (well, very close, anyway) means slightly lower pressures in the cylinders vs. the 5.5L engine, which means less NOx formation to some degree.

Here’s what else this means. It should be even easier to tune the M277 to AMG-like power and torque levels vs. the 5.5L, for those so inclined.
 
owns 2003 Mercedes-Benz S600
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