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US Debut: BMW Z4 sDrive28i 4-cylinder in Atacama Yellow

BMW Z4 | April 19th, 2011 by 18
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BMW 4-Cylinder Engines Return to US in 2011 in the Z4 sDrive28 As anticipated by BMWBLOG, the first four-cylinder BMW to return to the United …

BMW 4-Cylinder Engines Return to US in 2011 in the Z4 sDrive28

As anticipated by BMWBLOG, the first four-cylinder BMW to return to the United States is the Z4 sDrive28i Roadster. Introduced today at the BMW press conference in NYC, the Z4 in Atacama Yellow is powered by the all-new N20 four-cylinder TwinPower engine.

Like the Z4’s last TwinPower Turbo 3.0-liter turbo inline-6, the new 2.0-liter engine will combine highpressure 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-6 that it replaces in the Z4 sDrive30i.

US Debut: BMW Z4 sDrive28i 4 cylinder in Atacama Yellow

The 4-cylinder engine with its all-aluminum crankcase is lighter and more compact than a 6-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.

US Debut: BMW Z4 sDrive28i 4 cylinder in Atacama Yellow

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.

BMW has yet to release the official fuel consumption numbers, but we know that the heavier X1 28i has an average MPG of 29.7, so we expect even better numbers in the Z4.

No details either on whether the price of the Z4 will be increased.

[Photos: Christiaan Conover ]

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  • Tom

    BMW has completely throw the number nomenclature out the door associating a 2.0-L 4-cylinder engine with the 28i label. A bit sly.

    • Giom

      This is nothing new. In the 80s, the 523e used a 2.8l long stroke i6. Numerous other models had the same creative nomenclature treatment duo to engine technologies – not just size. There is nothing sly about it. If they said that it was a 2.8l capacity motor, then, that would have been dodge.

  • Giom

    Is it just me, or is that engine looking huge next the Z4?

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  • Otto

    “With 240 horsepower and 260 lb-ft of torque, it offers more power and torque”.

    Half wrong.
    The sDrive30i outputs 255 hp.

  • Otto

    “With 240 horsepower and 260 lb-ft of torque, it offers more power and torque”.

    Half wrong.
    The sDrive30i outputs 255 hp.

  • Dustin

    “No details either on whether the price of the Z4 will be increased.”

    Really? A smaller engine, and the price could actually INCREASE? Geez, it already starts at $48,000…

    • Otto

      In Germany, The X1 with the turbo I4 is cheaper than the I6 N/A. As far as I know, there’s no CO2 taxes there, so you can expect the turbo I4 models to be cheaper than the I6 N/A it replaces.

  • Dustin

    “No details either on whether the price of the Z4 will be increased.”

    Really? A smaller engine, and the price could actually INCREASE? Geez, it already starts at $48,000…

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  • Luke Panousopoulos

    It should be cheaper – a 4 Banger convertible made in the USA – gee – makes me want to run to the dealer and plop 50K! Like no one can buy a true European Convertible for less than 50K – VW, SAAB, or Volvo – or wait – a real German roadster like a Porsche Boxster (flat six though – but hey its a Porsche).

    • http://www.bmwblog.com Horatiu B.

      As we talked today, they might offer a four-cylinder 4 in the next 3er, but probably not in the first wave. I do expect the new 1 Series Coupe and Convertible to be offered with four bangers here.

      • Deavo1

        So, it seems you were wrong…

        • http://www.bmwblog.com Horatiu B.

          How was I wrong?

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