New Mercedes V8 in detail

[BMWDave]

The press release on the engines for the new W221 S-Class has finally come out, and the new V8 that was much debated on here when its specs first came out is in fact going to be a 4-valve/cylinder design.? Here's the introduction of the release, a link to it, and a few pictures:
The engines for the new Mercedes-Benz S-Class are new or further developments which offer up to 26 percent more output and up to 15 percent more torque then the preceding series. Fuel consumption is reduced by up to nine percent. In autumn 2005 a new 5.5-litre eight-cylinder engine developing 285 kW/388 hp will celebrate its world premiere together with the luxury saloon. The range of outputs from the engines in the S-Class will extend from 173 kW/235 hp in the S 320 CDI to 380 kW/517 hp in the twelve-cylinder S 600.

The newly developed eight-cylinder unit is the top model in the new generation of Mercedes-Benz V-engines which was successfully introduced in mid-2004. Equipped with four-valve technology, variably adjustable intake and exhaust camshafts, a two-stage intake module and tumble flaps in the intake ducts, the new V8 is among the most powerful yet economical engines in its displacement class. Maximum torque is also significantly improved compared with the previous V8 engine; it has increased by around 15 percent to 530 Newton metres, and is available within a wide engine speed range between 2800 and 4800 rpm. As a result the eight-cylinder powerplant offers driving pleasure more typical of a sports car. The new S 500 accelerates from zero to 100 km/h in 5.4 seconds (previous model: 6.3 seconds).

Despite the 26 percent higher output, the NEDC (combined) fuel consumption remains at the level of the preceding model at 11.7 to 11.9 litres per 100 kilometres.

Technical highlights in the new eight-cylinder engine also include special shifting camshafts. These reduce the inherent pressure fluctuations in the exhaust train and thereby considerably improve the engine?s gas cycle. This makes itself felt among other things by smoother running and higher torque in the lower and medium engine speed ranges.

The new Mercedes eight-cylinder employs the latest lightweight construction principles, with an aluminium crankcase, low-friction cylinder liners of aluminium/silicon alloy, a forged steel crankshaft and weight-optimised connecting rods. In addition to internal exhaust gas recirculation and secondary air injection, Mercedes-Benz uses two close-coupled catalytic converters with linear oxygen sensors to ensure low exhaust emissions. Thanks to its up-to-date engine technology and efficient emission control system, the new eight-cylinder engine complies with the most stringent exhaust emission standards now in place, and also has the potential to meet the limits planned for the future.

[ifcar]

When I posted the R32 article, I went through and deleted all the s and <div>s.  

[BMWDave]

When I posted the R32 article, I went through and deleted all the s and <div>s.  

Check it now

Right after I posted it I edited them out.

[ifcar]

When I posted the R32 article, I went through and deleted all the s and <div>s. 

Check it now

Right after I posted it I edited them out.

Bravo!    

[FlatBlackCaddy]

should the title be edited?

I don't think this thing has 48 valves, unless i missed part of the article(i skimmed through it twice, no mention of 48 valves).

[TBR]

I would hope not, that would be 6 valves per cylinder!  

[BMWDave]

I just edited the title..I was just copying and pasting this from C/D :)

[FlatBlackCaddy]

you must be a math major....



:D

I'm sure a 6 valve per cyclinder is possible but i'm sure we won't see one for awhile.

[giant_mtb]

The V-12 might have 48 valves...but not the V-8.

[TBR]

I think the V12 still has 3 valves per cylnder but I could be wrong.

[cawimmer430]

I think the V12 still has 3 valves per cylnder but I could be wrong.

The V12 is still the old 3-valve engine. The V6 and V8 have 4-valves per cylinder now.  

And I will be driving the W221 S500 (388-hp) soon!    

[Fire It Up]

Is the S/C V8 gonna be based off the new V8?

[TBR]

No, it will be based off of the new AMG 6.1l which is a completely different engine from the 5.5l.

[Submariner]

Is the S/C V8 gonna be based off the new V8?

Yes, but turbocharged.  


And its 6.2 liters.