2012 BMW Z4 sDriver28i - To test the new engine, BMW provided us with a 2012 Z4 sDrive28i model, along with a map to some scenery roads from Los Angeles to Carmel Valley, California. The Z4 Roadster maintains the same design and feature set, with the only major change coming from under the hood.
BMW introduces the all-new 2.0 liter four-cylinder engine, codename N20. The engine will not only power the entry-level Z4, but also next year’s 528i and the new, redesigned 328i. The four-cylinder turbo unit replaces the venerable N52B30 six-cylinder naturally aspirated unit, one of most acclaimed BMW engines in the line-up.
The compact and lighter N20 engine was pushed back with the same mounting points used to fit the six-cylinder and the current turbocharged 3.0 liter unit. The result is an impressive weight balance of 47.3/52.7 front-to-rear from the 47.9/52.1 of the previous model. BMW says the four cylinder weighs about 22 lb less than the outgoing unit. The overall weight of the car has therefore decreased by 33 pounds to 3,252.
With 240 horsepower between 5,000 and 6,500 and 260 lb-ft of torque, it serves up 15 fewer horsepower, but adds a significant increase in torque than the natural aspirated 3.0-liter inline-6, an additional 40 lb-ft of torque. The torque curve starts lower at 1,250 and ends at 4,800, while the redline stops at 7,000.
souces : http://www.bmwblog.com/2011/09/06/first-drive-review-2012-bmw-z4-sdrive28i/
BMW introduces the all-new 2.0 liter four-cylinder engine, codename N20. The engine will not only power the entry-level Z4, but also next year’s 528i and the new, redesigned 328i. The four-cylinder turbo unit replaces the venerable N52B30 six-cylinder naturally aspirated unit, one of most acclaimed BMW engines in the line-up.
With 240 horsepower between 5,000 and 6,500 and 260 lb-ft of torque, it serves up 15 fewer horsepower, but adds a significant increase in torque than the natural aspirated 3.0-liter inline-6, an additional 40 lb-ft of torque. The torque curve starts lower at 1,250 and ends at 4,800, while the redline stops at 7,000.
souces : http://www.bmwblog.com/2011/09/06/first-drive-review-2012-bmw-z4-sdrive28i/
