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Mercedes prepares to crush all rivals

The fuel economy wars are heating up, and we can partially thank (or blame depending on your view point) the U.S. government for increasing fuel efficiency. According to Edmunds, Mercedes Benz is looking to significantly boost fuel efficiency for the turbodiesel variant of its restyled 2014 E-Class luxury sedan.
 
The outgoing 2013 E350 Bluetec features a 3.0-liter V6 turbodiesel that produces 206 hp and 400 lb-ft of torque. It's enough to give the 4,000-lb sedan EPA ratings of 22 mpg city and 32 mpg highway.
 
However, the new 2014 E250 Bluetec 4Matic gives up two cylinders and a bit of power and torque to significantly boost highway fuel economy. The 2.1-liter, 4-cylinder turbodiesel engine uses twin sequential turbochargers to generate 195 hp and a still impressive 369 lb-ft of torque, however, highway fuel economy skyrockets to 45 mpg.


2014 Mercedes E-Class
 
Projected city and combined fuel rating are not available, but we expect those figure to rise sharply as well.
 
The 45 mpg highway rating makes the E250 Bluetec 4Matic even more fuel efficient than the lighter, less powerful Volkswagen Passat TDI which has an EPA highway rating of 43 mpg. And as its name implies, the E250 Bluetec 4Matic manages that lofty figure with the added heft of an all-wheel-drive system.
 
Mercedes has yet to announce pricing for the 2014 E250 Bluetec 4Matic, but the 2013 model starts at a $52,200 and lacks AWD.

Source: Edmunds



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RE: More info?
By mjv.theory on 5/20/2013 9:50:44 AM , Rating: 1
I agree, more details would be nice. That said might we might speculate on how the efficiency has been improved. First of all, the number of cylinders is no particular correlation to power, torque or efficiency. The cylinder size has increased slightly and if bore were increased as well it help retain the max torque figure; likely at the cost of usable rev range. Changes to the fuel injection system could explain a high max. power, whilst also allowing considerably improved cruising mpg (further helped by the reduction in capacity). The main requirement is clever engine management software to hide all this from the driver.

The main point being that the traditional methods of implementing internal combustion engines in vehicles is highly inefficient. Historically this is limited by a need to make engines mechanically self-regulating. By implementing electronic control with optimised software and sufficient processing power, removes some of the traditional limitations to ICE inefficiency. Talk of adding $5,000 to the price of a car to meet fuel economy targets is nonsense, IMO.


RE: More info?
By 91TTZ on 5/20/2013 10:59:01 AM , Rating: 2
quote:
The cylinder size has increased slightly and if bore were increased as well it help retain the max torque figure; likely at the cost of usable rev range


You're thinking of stroke, not bore. Longer stroke is what often limits the rev range. But that's on gas engines which rev much higher than diesel engines.

quote:
Changes to the fuel injection system could explain a high max. power, whilst also allowing considerably improved cruising mpg (further helped by the reduction in capacity)


There aren't going to be many drastic changes to a diesel's fuel injection system. What could they really do? A recent change to gas engine fuel injection is a move to direct injection, but diesels have always been direct injection... they're diesels.

quote:
The main point being that the traditional methods of implementing internal combustion engines in vehicles is highly inefficient. Historically this is limited by a need to make engines mechanically self-regulating.


What are you talking about? They are using traditional methods in the redesign of this engine. They're using the old-fashioned tactic of reducing displacement in order to increase efficiency.

Engines haven't been "self-regulating" for a very long time. Many cars went with full computer control back in the 1970s.


"We don't know how to make a $500 computer that's not a piece of junk." -- Apple CEO Steve Jobs














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