Allison Rolls Royce 250 Helicopter Engine Gear on 2040-parts.com

Video: Michael Mauer on the 991-series Porsche 911

Porsche has released a video featuring its Design Director, Michael Mauer, explaining how he and his team went about redesigning the 911, an ‘automotive, engineering icon' as he describes it. "What we as designers are striving to above all is to optimize the width to height ratio with the result that although the 911's width has not increased, the front axle area has become wider, and we've managed to make the roof a bit lower," Mauer explains via a rather dramatic-sounding voiceover.

Saleen S351 Mustang being prepped

After a tumultuous and sometimes litigious couple of years (which included Steve Saleen the man suing Saleen the company for calling itself Saleen!), Saleen the man, the car and the company with the man again in the driver's seat are back, still in Southern California and still in the bustling Inland Empire burg of Corona to which they all ensconced a few years ago. So what's new? First up is a Saleen 351 Mustang, which was announced at the LA auto show last week.

Mercedes-Benz CLA180 cheats the wind

Mercedes-Benz claims its new CLA180 BlueEfficiency Edition will be the world's most aerodynamically efficient production road car when the European deliveries begin in June. The swoopy four-door sedan forms part of an initial five-car lineup of CLA models set for a public debut at the Geneva motor show in March. With an official drag co-efficient of 0.22, the CLA180 Blue Efficiency Edition undercuts the existing aerodynamic champion, the Mercedes B180 BlueEfficiency with the optional eco technology package, which claims a 0.24 Cd.