In another major step forward for its EfficiencyDynamics program, BMW is bringing four-cylinder engines back to its U.S. lineup, starting with the dynamic and efficient Z4 sDrive28i.
Of course, as one would expect from a company like BMW, the dramatically designed roadster won’t boast just any four-cylinder engine. Beneath the Z4′s long hood will be a TwinPower forced-induction 2.0-liter I4 that leverages:
- High-pressure direct-injection that increases efficiency through precise control of the fuel supply, clean and homogenous combustion, and a high combustion ratio
- The automaker’s hallmark VALVETRONIC intake control technology, which leverages seamlessly variable intake valve-lift control for a faster response and reduced pumping losses
- A single twin-scroll turbocharger for optimal performance and no delays in throttle response
The result is a sophisticated engine that delivers significantly more power—and notably better fuel efficiency—than the naturally aspirated six-cylinder engine found in today’s BMW Z4 sDrive30i.
Specifically, the four-cylinder Z4 sDrive28i will provide 240 maximum hp, which will be available at 5,000 rpm—1,500 rpm lower than in the Z4 sDrive30i—and 260 lb.-ft. of peak torque at 1,250 rpm—also 1,500 rpm lower. Further, while EPA ratings aren’t yet available, the I4 Z4 is expected to offer 20 percent better fuel efficiency when fitted with a new BMW eight-speed automatic transmission. And remember, the bigger-engined car already gets an impressive EPA rating of 28 mpg highway.
The new BMW Z4 sDrive28i will reach U.S. BMW centers beginning this fall.
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