Cylinder shut off on '500' engines...

[jasohal]

Does any one know if all the '500' engines after a certain year had the cylinder shut off technology, where the engine uses only 4 of the cylinders when not on full load ?

Or was this an optional extra ?

Pretty sure the CL has it as it gives really good MPG on the motorway whilst cruising at around 80....

any info welcome

Thanks

 

[Rose Chap]

I know the Northstar V8s in Cadillacs had that feature (about the only good thing about those cars), but I don't remember hearing about it in Mercedes. Maybe someone else is a bit more clued up than me?

 

[DC_insider]

Its called Active Cylinder Control (ACC) and was a feature on the M113 5.0l V8. However, I don't know if it was a standard or optional feature. I'll try and dig around for some info.

 

[grober]

Think it was a standard fitment on the S class V8 saloons so probably on the CL also.
Mercedes-Benz S-Class, 220 series (1998 to 2005)

With the S-Class sedan from the 220 series introduced at the Paris Motor Show in September 1998, the Mercedes-Benz product drive launched more than five years earlier reached a new high point. Over 30 new developments once again made the S-Class from Mercedes-Benz a trendsetter for passenger car design in general. These included automatic cylinder shut-off, which converted the S 500’s eight-cylinder unit into a four-cylinder as required, DISTRONIC autonomous intelligent cruise control and the PRE-SAFE preventative occupant protection system (introduced in 2001), with which Mercedes-Benz moved into a new era of automotive safety. Production of the W 220 series is due to come to an end in fall 2005, making way for the W 221 series.
They would also have had the tumble flaps in the inlet manifold which increase the effective length of the inlet ports increasing torque at low revs.

 

[stats007]

Its called Active Cylinder Control (ACC) and was a feature on the M113 5.0l V8. However, I don't know if it was a standard or optional feature. I'll try and dig around for some info.

It certainly isn't standard - I've not heard of this on any UK M113 - I know the V12 got it in 2001 I think.

 

[grober]

Think it was a standard fitment on the S class V8 saloons so probably on the CL also.
Maybe only for certain markets?

 

[KLP 92]

It was a feature on some of the 5 litre V8s. It was only for a very limited run as they were too many problems with them so MB stopped the cylinder shut off. Well thats what i heard!

 

[BTB 500]

Pretty sure the CL has it as it gives really good MPG on the motorway whilst cruising at around 80....

How good?

 

[saorbust]

It was on the 12 cylinder CL as standard and an option on the V8.

 

[SG CL500]

it seems there are several stories going around - i've read that it was a capability only fitted to US spec engines

 

[grober]

WIKIPEDIA entry:-

Active Cylinder Control

DaimlerChrysler's Active Cylinder Control (ACC) is a variable displacement technology. It debuted in 2001 on the 5.8 L V12 in the CL600 and S600. Like Chrysler's later Multi-Displacement System, General Motors' Displacement on Demand and Honda's Variable Cylinder Management, it deactivates one bank of the engine's cylinders when the throttle is closed.

In order to preserve the sound of the engines, DaimlerChrysler worked with Eberspaecher to design a special exhaust system for ACC-equipped vehicles. The system uses an active valve to divert exhaust between two different exhaust systems. It also has a variable length intake manifold system to optimize output in the two modes.
Applications

* M138 V12 2001-2002

See also

* Variable displacement

 

[MangoMan]

This is how I read it.....

"The newly developed automatic cylinder shut-off turned the eight-cylinder S 500 temporarily into a four-cylinder - a feature which had a dramatic impact on fuel consumption without compromising on smoothness, torque or quietness. To put that into figures, when four of the eight cylinders were shut off under partial load conditions, NEDC fuel consumption (New European Driving Cycle) for the S 500 was cut by an average of seven percent. Indeed, thanks to the automatic cylinder shut-off even greater economies were to be achieved depending on driving circumstances: At a constant 74mph gasoline consumption fell by about 13 percent, and at a constant 55mph by as much as 15 percent. The automatic cylinder shut-off was activated whenever the V8 engine was obliged to deliver only a fraction of its output and torque - for example, in city traffic, on trunk roads or for steady motorway driving at moderate speed".

And here - Fast Forward to 2:50 minutes.

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[BTB 500]

Holy thread revival, Batman!

 

[MangoMan]

Holy thread revival, Batman!

I was looking to see if I could find out more about it and it sent me here - didn't notice the date....lol.... Sorry.

 

[Smart320]

Think the 2012 model SLK 55 AMG also has it, been checking a few specs out as part of my thought process with the idea of a V8 purchase later in the year.

 

[190]

I drove a Chrysler 300C with the 5.7 V8 back in 2005 and the cylinder cut off was imperceptible. It helped the 'beast' as we called it achieve 30mpg. MB were in bed with Chrysler at the time so it may well have been MB's technology.

 

[st13phil]

Think the 2012 model SLK 55 AMG also has it, been checking a few specs out as part of my thought process with the idea of a V8 purchase later in the year.

The M152 engine in the R172 SLK55 does indeed have cylinder deactivation, and it works pretty seamlessly. The only giveaway when it goes onto 4 cylinders is that the exhaust note goes a bit flat and the indicator in the instrument cluster changes. On level ground it will cruise happily at up to 100mph on 4 cylinders, but needs all 8 if you want to cruise at 110mph

 

[Uky]

In the V8's, ZAS (Zylinder Ab Schaltung) was an option that was available in W220 and C215
(at least on early models) but the option was dropped since MB had some problem with it.

 

[JJQuiggs765]

Does the ACC apply to the W163 ML500