• Feb 2nd 2011 at 6:55PM
  • 13
BMW's four-cylinder turbocharged engine – Click above for high-res image gallery

German automaker BMW has tempted us before with hints that its 2.0-liter turbocharged four-cylinder engine will eventually appear in the States. BMW has now finally, officially confirmed that this potent mill will, in fact, hit U.S. soil later this year.

BMW's four-cylinder engine utilizes twin-scroll turbo technology to crank out 240 horsepower and a peak torque of 260 pound-feet at 1,250 rpm. The low-displacement, direct-injected four pot is expected to yield a significant bump in fuel economy over BMW's six-cylinder engines.

BMW has not said which of its models will be available with the new 2.0-liter turbo, but the automaker has mentioned that the engine offers more power and torque than its 3.0-liter inline-six, which would lead us to believe that the Z4 sDrive30i, 1 and 3 Series, along with the X1, are potential candidates for the turbo-four engine.

  • BMW X1 2.0 Turbocharged Four Cylinder

  • BMW X1 2.0 Turbocharged Four Cylinder

  • BMW X1 2.0 Turbocharged Four Cylinder

  • BMW X1 2.0 Turbocharged Four Cylinder

[Source: BMW]
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BMW Four-Cylinder Engines Return to US in 2011

New 2.0-liter turbocharged four-cylinder offers performance of a six

Woodcliff Lake, NJ – January 28, 2011... BMW announced the return of a four-cylinder engine to the US BMW line-up for the first time in since 1999. Like the company's latest 3.0-liter turbo inline six, the new 2.0-liter engine will combine twin-scroll turbocharging with high-pressure direct-injection and BMW's VALVETRONIC intake control. With 240 horsepower and 260 lb-ft of torque, it offers more power and torque than BMW's normally aspirated 3.0-liter inline six. It will arrive later in 2011.

Maximum output of 240 horsepower is achieved at 5,000 rpm, 1,500 rpm lower than in the normally-aspirated 3.0-liter inline six. The peak torque of 260 lb-ft, comes on stream at just 1,250 rpm. Not only is that 30% more torque than the aforementioned inline six, it also peaks 1,500 rpm earlier. The vigorous power comes on early and climbs steadily all the way to redline.

The four-cylinder engine with its all-aluminum crankcase is lighter and more compact than a six-cylinder engine of equivalent power. The turbocharger is a twin-scroll system. The exhaust streams leaving the two pairs of cylinders are kept completely separate as they flow through the exhaust manifold and the turbocharger, taking a spiral path to the turbine wheel. This configuration results in very low exhaust back pressure at low engine rpm, and allows the energy of the exhaust gas pulses to be optimally managed and translated into powerful rotation of the turbine blades, without a delay in throttle response.

The patented BMW VALVETRONIC system with seamlessly variable intake valve lift control dispenses with the throttle valve system typical of conventional engines. Instead, combustion air mass is controlled inside the engine, resulting in much faster response. Pumping losses are kept to a minimum, making the engine more efficient.

The High Precision Injection direct-injection system also helps to improve efficiency. Centrally positioned between the valves, solenoid injectors with a maximum injection pressure of 200 bar (2,900 psi) precisely control the supply of fuel. The fuel is injected very close to the spark plug, resulting in clean and homogeneous combustion.

The cooling effect of the injected fuel also allows for a higher compression ratio than might otherwise be possible. This results in further efficiency improvements.

US-specific model and timing information will follow at a later date, but this new chapter in the story of BMW EfficientDynamics will arrive later this year.

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    • 1 Second Ago
      • 4 Years Ago
      260lb/ft @ 1250rpm

      I feel like "ultimate driving machine" actually means something again. It's been ultimate yuppie machine for so long, I've forgotten that BMW are actually known for making performance cars. I can only hope that the new engine will be longitudinally mounted for rear wheel drive and 4-wheel drive. An X-version with this engine would be irresistible.

      With twin-scroll and direct injection, no reason this engine can't make 30mpg combined in a 1-series or 3-series.
        • 4 Years Ago
        That is indeed some wicked torques! This engine might be more fun then a greased pig in a water slide.
      • 4 Years Ago
      Can I have an amen? Let's all say thank you to BMW for finally deciding to bring their A game to the States.
        • 4 Years Ago
        This is NOT BMW's A-game.
        BMW should have added direct injection to their N52 engine while retaining Valvetronic.
        This is BMW cost cutting. They chopped two cylinders off the N55 and called it a day.

        The N53 (direct injection/no valvetronic) was already about 270hp.

        BMW could have produced a 3 liter inline 6 with 270-285hp, works with US piss gasoline, making emissions standards.
        • 4 Years Ago

        Bout friggin' time!! and they didn't just bring an average 4 banger like the ol' 1.8/1.9, we get the good one :)
        • 4 Years Ago
        AMEN brother Spence!
        • 4 Years Ago
        "Can I have an amen?"

        Sorry, not until the twin scroll diesel comes hither.

      • 4 Years Ago
      My new Sonata Turbo 2.0: 274 hp. I love the twin scroll by the way.
        • 4 Years Ago
        I think the Sonata may actually have the better engine compared to the BMW 4-cyl twin-scroll. It is hitting higher HP and torque numbers, and will most likely get better MPG. It is pretty sad to see BMW following behind Hyundai/Kia with less of an engine, possibly years later than Hyundai/Kia.

        BMW should send a twin scroll version of their 123d engine instead. More torque, better mpg.
      • 4 Years Ago
      Now bring the 2.0 Turbo-diesel and the 320D.
      • 4 Years Ago
      Is anybody else confused by how the new 5 series models get better fuel economy than their 3 series counterparts? For example, the 528i gets 32 mpg highway whereas the 328i gets 28 mpg. The 535i also bests the 335i. Maybe this engine will get things back in line.
        • 4 Years Ago
        Different transmissions.
        The final gear is a bit more longer now, and i think for some models they added a gear too.

        As for the new engine, i doubt it will be some kind of miracle for fuel economy.
        Highway MPG may be good, but there isn't much improving that city fuel economy.. the car's weight will hold it back, same as with the 318ti back in the day.
      • 4 Years Ago
      not green
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