Mercedes GLK250 BlueTEC 4MATIC Bringing Diesel Tech to a Midsize…

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Mercedes-Benz GL320 GDI

Article From: Automotive Production Gary S. Vasilash.

Posted on: 6/26/2013

Peter title is director, Diesel Development.

If Lückert worked at automo-tive companies, that be like carrying a card to “Repairman, Maytag Corp.”

But doesn’t work at most companies. He works at Mercedes-Benz. And at they take diesel rather seriously.

In recent in the U.S.*, Mercedes has offered a of diesels. Staring in model 2007, it began offering a V6 (replacing the in-line configuration it had long had on offer) with direct injection (CDI). CDI engine was the first ULEV the 215-hp, 398 lb-ft diesel was as the ML320 CDI, GL320 CDI and CDI, all SUVs (with the being an SUV of a sort).

2007 saw a world-wide introduction in the U.S. the BlueTEC diesel, a 210-hp, engine that features technology that made it compliant (meeting BIN5 NOx and limits).

Then the even diesel was launched in 2009, the AdBlue exhaust gas after-treatment was made available on the ML320 GL320 BlueTEC, and R320 with the “320” being the V6 turbodiesel found in the E320 but in this case, the engine had from the sedan to the SUV lineup. In the Sprinter commercial van was offered a 3.0-liter V6 diesel providing 188 hp and 325

And they’ve just launched the OM 651 diesel, a 2.1-liter four, in the GLK-Class. (And perhaps by the you read this, there be the same engine under the of the 2012 E-Class.) In the SUV, the produces 200 hp and 369 lb-ft of torque.

Lückert hasn’t had a whole lot of on his hands.

The BlueTEC approach to the emissions of diesel engines is straightforward and clever. Mercedes with a diesel oxidation that handles carbon and hydrocarbons. There’s a catalytic to process nitrogen oxidebut is not necessarily capable of dealing all of it. There is a particulate filter collects the “soot” (when the is filled, then this is out of the filter). Then there is the selective catalytic reduction converter. This is where the comes into play, a consisting essentially of urea and (tinted blue, sort of windshield washer fluid). is injected into the exhaust gas and ammonia (NH3) converts the NOx nitrogen and water.

Lückert says there are aspects of making the diesel setup in the GLK250 BlueTEC highly efficient. One is to reduce engine losses. So they are roller bearings for the Lanchester shafts. There is an adjustable oil to reduce hydraulic losses. have increased the thermal of the engine. There is a high-performance system; the common rail performs at 2,000 bar. is a switchable water pump and a EGR cooler. The all-aluminum in-line has a two-stage turbocharger system the two turbosa small high-pressure unit and a large low-pressure turboconnected in series: the HP unit is right at the exhaust manifold and the LP along the way.

The HP turbine can at up to 215,000 rpm. The LP turbo can at up to 185,000. The HP turbo housing has a duct; the duct is opened or by a vacuum-operated wastegate. So when all of the exhaust gas goes through the HP which makes it effective at low engine speeds. As the engine increases, then the wastegate thereby routing the exhaust gas to the LP

Meanwhile, on the intake side of the air goes through a low-pressure compressed by the LP turbo, then to the HP for further compression. Further the performance of this setup is an that reduces the temperature of the air by some 280F, which that there is a larger of air pumped into the combustion

All of this contributes to improved performance, as in high torque at low speeds, no turbo lag, and fuel economy: 24 mpg city/33 mpg (Of course, it should be noted the fuel economy isn’t entirely on the diesel engine; the BlueTEC is also equipped a seven-speed automatic transmission.)

Mercedes-Benz GL320 GDI

One interesting aspect of Mercedes’ to this diesel offering is how it is and priced in the GLK lineup. There is the GLK350 with a 3.5-liter, aspirated V6 that provides 302 hp and 273 of torque. It is priced (absent charges) at $37,090. There is the 4MATIC, which adds the four-wheel drive system to the It is priced at $39,090. Then is the GLK250 BlueTEC 4MATIC, is priced at $38,950. While vehicles are typically priced than their gasoline-powered Mercedes is taking an approach to the diesel cost competitive the gasoline vehicles. While the V6 more horsepower302 vs. 200the four pro-vides more vs. 273. What’s more, it comes to fuel economy, the is way ahead24/33/28 mpg (city/highway/combined) vs. 19/24/21

As fuel economy regulations tighter, it is a safe bet that Lückert will get a whole lot

*If you want to know when started with diesels in the you’ll have to go back than 60 years: in 1949 it a 38-hp, 71 lb-ft 1.7-liter four, the 170D. That is not a typo.

The 2013 Mercedes GLK250 4MATIC @ a Glance

The name is a bit So briefly, this is a GLK, the of the Mercedes SUVs, with the being the G-, GL- and M-Class models. the GLK350 has a 3.5-liter gasoline the GLK250 has a 2.1-liter diesel so the nomenclature isn’t 1:1. The refers to the after-treatment system to clean the diesel exhaust. In the of the GLK250, it includes the selective reduction catalytic converter, uses “AdBlue,” a urea-based to further minimize emissions. The refers to the full-time, four-wheel system.

Visually, compared the model year 2012 the 2013 model has new headlamps, LED running lights, front and bumpers, side view design, and 19-in. wheel Inside, there are significant to the IP, including a color instrument for the center gauge, new air outlet and a single piece of wood on the front of the IP rather than pieces. The gear selector has moved from the center position to the steering column, allows a larger storage bin in the console. In addition to which, is a new steering wheel.

The five-passenger vehicle is 178.3-in. has a 108.5-in. wheelbase, and is 74.25-in. and 66.9-in. wide. It has a curb of 4,321 lb.

The 2013 GLK250 4MATIC. As part of Mercedes’ initiative, they have put a direct-injection, four-cylinder diesel in a vehicle that has previously offered only with a V6 gasoline engine.

Mercedes-Benz GL320 GDI
Mercedes-Benz GL320 GDI
Mercedes-Benz GL320 GDI


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