Mercedes-Benz C 250 CDI Blue EFFICIENCY (45 mpg) achieved with super-charging and engine downsizing.

http://www.theautochannel.com/news/2008/09/10/099224.html




STUTTGART – September 10, 2008: Mercedes-Benz is set to launch a completely new diesel engine generation starting in the autumn of 2008. For its world premiere, the Stuttgart-based car manufacturer will unveil a C-Class model with this new four-cylinder engine. In the C 250 CDI BlueEFFICIENCY Prime Edition, this engine produces, with its 2.2 litres of displacement, 150 kW / 204 hp and 500 Nm of torque. The premiere model can accelerate from a standstill to 100 km/h in just 7.0 seconds, on the way to its top speed of 250 km/h. Notwithstanding these exceptional performance figures, the Prime Edition only consumes an average of 5.2 litres of fuel per 100 km (NEDC), with CO2 emissions of 138 g/km. The engine impresses with its eager responsiveness and smoothness of operation, which can make it a sensible alternative to the higher-displacement six-cylinder engines in future.

Exemplary figures in terms of power output, consumption and emission characteristics A displacement of 2143 cc, 150 kW / 204 hp, and 500 Nm of torque - these are the engine's key figures. Figures that place this newly-developed four-cylinder diesel engine in the top position among the diesel engines of its class. At the same time, in the C 250 CDIBlueEFFICIENCY Prime Edition, the engine consumes on average just 5.2 litres of fuel per hundred kilometres (NEDC) {I compute that to be 43.7 mpg. Here they compute mpg at 45.__JW]}, a value achieved by no other comparable motor car . Apart from exceptional power output figures, the new powerplant offers significantly improved torque build-up from low engine speeds, compared to its predecessor model. The benefit of this is that in everyday driving situations it enables low-consumption driving at low engine speeds.{this is what super-charging can do. gives you loads of torque at low engine speeds.__JW}
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Exemplary figures in terms of power output, consumption and emission characteristics are achieved by the new engine thanks to the implementation of a whole package of innovative technologies. This includes among other things:

> a maximum ignition pressure of 200 bar,

> fourth-generation common-rail technology with a rail pressure increased by 400 bar to 2000 bar, as well as a new piezo-injector concept with direct nozzle needle control for greater flexibility in injection timing, leading to smoother running of the engine,

> larger, variable oil spray nozzles and variable water pump,

> dual-stage supercharging. Another design innovation is the camshaft drive positioned at the rear. This way, with a north-south installation design and engine bonnet rising towards the rear, it is possible to comply even better with pedestrian protection regulations.
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I'm a Volvo-driving liberal ;-) and I really hope they come out with a great mileage car, or I'm just going to have to jump ship after four of them when my current 95 gives out (in about another 500,000 miles).:P

I'm not in love with my V-70. We're getting about 21mpg, and it's required a rather lot of repair work for a car with less than 40K miles.

when Ford got involved in the late 90s. I'm glad I still have a good pre-Ford Volvo.

I fell in love with a Toyota Vitz when we were overseas this summer. It is a tiny little car with lots of room for big people somehow and even some luggage. Talk about a gas sipper. I think the U.S. version is the Yaris. We are planning to micro downsize. My neighbor is getting a Smart Car and more and more of them are showing up around Houston. They are built by Mercedes, but I don't think their mileage is any better than the Yaris or Honda Fit and they are way littler. But very cool.

ON EDIT: It's not all Ford's fault. My mechanic told me not to buy the new 5-cylinder. He said they are not as good, and Volvo began to make them before Ford merged in.

when I learned that Ford owned them. I was told that Volvo was run independently, and Ford had left them alone to do their thing, etc.

Of course, people say all kinds of things.

and his generic theory about auto makers is that they periodically figure out how to make a really good, reliable car, but then the company bean-counters will immediately start messing with the design. "Hey, we can just make this part a little cheaper..." Or they'll keep "improving" the design until they fuck it up again. You can see why it happens. If they just left it alone, a bunch of people would suddenly be out of work.

Anyway, apparently the trick is to know which brand/make/model-years are the good ones, and stick with those.

I have absolutely no talent for that trick.

http://www.democraticunderground.com/discuss/duboard.php?az=view_all&address=115x170506


"Fiat’s new Multiair, which should be on sale in a year or so, uses hydraulics and electronics to optimise the engine’s valve settings. When this combines with a supercharger or turbocharger, Fiat reckons, a “downsized” two-cylinder engine can be made to perform like a bigger four-cylinder one—though it will use some 20% less fuel. "

http://www.greencarcongress.com/2006/05/antonov_to_demo.html


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Antonov to Demonstrate Two-Speed Supercharger Drive System; An Enabler for Downsizing
5 May 2006

Antonov 2-speed supercharger drive.

Antonov, an automotive technology company, will demonstrate the world’s first two-speed supercharger drive system to enter series production next week at the Engine Expo exhibition in Stuttgart, Germany.

The Antonov Mechanical Module two-speed drives a Rotrex centrifugal pump supercharger faster at low engine speeds, thereby delivering a higher boost ratio to provide additional low speed engine torque.