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Sky takes Mazda powertrains to the next level

Mazda's next-generation of powertrains, called Sky, will feature a variety of new technologies that company engineers say improve fuel efficiency by 20 percent. The Sky engines--Sky-G for the gasoline version, Sky-D for diesel--coupled with a Sky-Drive automatic transmission or a six-speed manual, were offered for test drives during a technology day in Berlin. The Sky-G engine we drove was a 2.0-liter inline-four that made 160 hp and 155 lb-ft of torque.

Acura NSX prototype will drive Mid-Ohio prior to IndyCar race

Acura's new, long-awaited NSX is still two years from arriving in customers' impatient hands, but attend the Izod IndyCar Series race at Mid-Ohio on Aug. 4 and you'll have the opportunity to see and hear the car in action. Acura on Thursday released an image of a prototype NSX, and said the car will take to the racetrack just prior to the Honda Indy 200 in Lexington, Ohio.

More Power! Get the details on the potent Porsche 911 GT3 RS 4.0

Porsche has ramped up the already heady performance of the 911 GT3 RS through the adoption of a new, naturally aspirated 4.0-liter version of the company's sturdy, horizontally opposed flat six-cylinder engine. The unit kicks out 50 hp more than the 3.8-liter six-cylinder used in the existing 911 GT3 RS. This mill claims 500 hp at 8,250 rpm, a figure which makes the speedster the most powerful naturally aspirated road-going version of the 911 ever.