Arias Pistons 12.5:1 Compression 82mm Bore Honda B-series on 2040-parts.com

There's a 2015 Ford Mustang convertible on the way, too

Almost immediately after the Ford Mustang debuted, buyers could choose from three body styles -- a hardtop, a rag-top convertible and a fastback (which actually came out a few months later than the hardtop and convertible). We already knew that the 2015 Mustang will arrive as a fastback (sorry, notchback partisans), but Ford has just announced that a drop-top version is also in the works. Pictures of the convertible sport a shiny "5.0" badge on the side and and chrome "GT" badge on the back, but we assume all the standard engines -- the 5.0-liter V8, 3.7-liter V6 and that new 2.3-liter EcoBoost turbo-four -- will be offered.

First Sight: Smart Fortwo and Forfour

"Dress-down Wednesday," remarked a colleague as Daimler CEO Dieter Zetsche walked on stage wearing jeans and no tie. While it was a hot day in Berlin, Zetsche's excuse for his informal attire was the occasion – the new Smart is here. Its prospective owners, he explained – young, urban consumers with an active lifestyle, not the typical members of corporate Germany – adhere to a different, if similarly rigid etiquette.

Porsche 918 Spyder: The first ride in the future game changer

Faster than the iconic Carrera GT yet more economical than parent company Volkswagen's frugal new Up supermini, Porsche's next supercar, the 762-hp gasoline-electric powered 918 Spyder, promises to offer the best of both worlds—scorching performance and ultralow consumption. Autoweek joins Porsche's engineering team for the very first test of the car that is already causing headaches in Maranello and Sant'Agata. For all of its intense promise and awesome potential, the very first running prototype of the upcoming Porsche 918 Spyder looks suspiciously like a refugee from a shadowy postapocalyptic movie set as it glides silently into view across the vast expanse of bitumen at the Nardo test track in southern Italy.