S CLASS - Four Pot on the Way

[hawk20]

Rumours have surfaced that Mercedes plans to introduce their first four-cylinder S-Class. Being prepped for introduction at the Frankfurt Motor Show, the Mercedes-Benz S 250 CDI BlueEFFICIENCY will produce just 155 grams of CO2 per kilometer.

The S 250 CDI uses the same 2.1-liter diesel engine already found in the C-Class and E-Class and produces up to 224 horsepower with a maximum 500 Nm of torque. Performance figures have not been released, but we do know that the car will travel 100 km on about 5.9 liters of fuel giving a combined figure of about 47 mpg compared with the 35 mpg of the 6 cylinder diesel. Although entry-level, the S 250 CDI produces only 11 hp less than the S 350CDI, which uses a V6 CDI engine.
http://www.worldcarfans.com/109082521282/mercedes-benz-s-250-cdi-blueefficiency-cometh--first-ever-4-cylinder-s-class

 

[Mactech]

I think you are a couple of weeks late with this one!

http://www.mbclub.co.uk/forums/news...efficiency-first-ever-4-cylinder-s-class.html

 

[DieselE]

Don't forget that you "don't get owt for nowt" in this world. The torque curve of the new engine is very different from the 3L V6. Maximum torque is available over a much smaller rev range. I very much doubt that the effortless driving experience of the big diesel will still be there.

 

[hawk20]

Don't forget that you "don't get owt for nowt" in this world. The torque curve of the new engine is very different from the 3L V6. Maximum torque is available over a much smaller rev range. I very much doubt that the effortless driving experience of the big diesel will still be there.

Will that be true even with twin turbos? The performance of the engine in the E class is pretty terrific for a four cylinder, but no doubt the 6 cylinder will be more refined and effortless. However as fuel prices rise, economy will become more and more important.

Will this engine later go into the ML I wonder, because the X5 is in a lower tax band? And even in the R class? The power makes the 280cdi/300cdi almost redundant?

 

[C240Sport97]

Don't forget that you "don't get owt for nowt" in this world. The torque curve of the new engine is very different from the 3L V6. Maximum torque is available over a much smaller rev range. I very much doubt that the effortless driving experience of the big diesel will still be there.

E250 CDi:
HP: 204
Max torque: 500NM from 1600 to 1800rpm
0 to 62: 7.7

E350CDi:
HP:231
Max torque: 540NM from 1600 to 2400rpm
0 to 62: 6.8

 

[Dryce]

E250 CDi:
HP: 204
Max torque: 500NM from 1600 to 1800rpm
0 to 62: 7.7

E350CDi:
HP:231
Max torque: 540NM from 1600 to 2400rpm
0 to 62: 6.8

There's an argument in those numbers for pairing the E250 CDi with a CVT.

 

[st4]

Hawk20 - was reading that MB were going to hybridise the S class with this engine. Makes more sense than pairing an electric drivetrain with a petrol 6.

One critisism of this new 250cdi engine is that because of its high specific output refinement isn't as good as a 220cdi. Given the S class majors on this, a 220cdi with 170bhp + is probably a better bet for the 4 pot S class. Remember your older S320cdi you had didn't have much more power but a heavier engine to haul about.

 

[stevesey]

E250 CDi:
HP: 204
Max torque: 500NM from 1600 to 1800rpm
0 to 62: 7.7

E350CDi:
HP:231
Max torque: 540NM from 1600 to 2400rpm
0 to 62: 6.8

About 460Nm over the same range as the 350Cdi, pretty good really.

 

[Diesel Benz]

Hawk20 - was reading that MB were going to hybridise the S class with this engine. Makes more sense than pairing an electric drivetrain with a petrol 6.

One critisism of this new 250cdi engine is that because of its high specific output refinement isn't as good as a 220cdi. Given the S class majors on this, a 220cdi with 170bhp + is probably a better bet for the 4 pot S class. Remember your older S320cdi you had didn't have much more power but a heavier engine to haul about.

The old I6 still beats the 250CDI because of the better torque curve, even if it is heavier and the max torque and max power are similar (aren't they exactly the same?).

I did not understand the criticism towards the 250CDI, I cannot see any disadvantage compared to the 220CDI (if longevity would not be one). The 250CDI with a hybrid that makes it accelerate like an S320CDI or even an S500 would be nice.

I did not find the I6 or V6 torque figures from the W211 but this attached figure is the same V6 from the W221.

 

[Mactech]

The phrase 'It's not what you do but the way that you do it' springs to mind.
The four cylinder engine can produce very impressive power and economy figures. The width of the torque curve is of some concern, but we will have to wait and see if it can do 'effortless and refined' in the setting of the S class.
With experience of the V6 in E, ML and S. I'd say it has it's best shot in the S.

 

[wemorgan]

I quite like what VAG have done to their TSI engines, having both a clutched supercharger and a turbo. With MB history of supercharging MB should have the know-how to do something similar.