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

Mercedes Ener-G-Force concept (2012) first pictures

Mercedes' latest concept car is, in its own words, 'pure, rendered science fiction'. This is the new Ener-G-Force, a one-off model depicting a civilian version of a futuristic police car. It's a product of the 2012 Los Angeles Design Challenge, which briefed manufacturers to dream up their vision for a highway patrol vehicle fit for the year 2025.

Ironman Stewart retires, sells all

The off-road racing accomplishments of Ivan "Ironman" Stewart might never be matched: 82 major wins in desert racing, 17 of them in the crash-and-bang Mickey Thompson stadium series, three Baja 1000s and others too numerous to squeeze in here over a career that spanned 30 years. The thing that really sets him apart is that, while competitors shared driving duties over the long desert courses, Stewart did the vast majority of them alone, with no relief drivers--just him and the dirty, dusty desert. But even legends want to retire someday.

Detroit auto show 2012 - a video review of the NAIAS

It's CAR's traditional three wise-ish men in a car video review of the 2012 North American International Auto Show. Hear the analysis from our European editor Georg Kacher, contributing editor Ben Oliver and anchorman associate editor Tim Pollard, as they chew over the new cars, surprises, delights and disappointments from the Detroit auto show. NAIAS 2012 was a more sober affair than the previous era of showmanship; there were no herds of cattle being steered down Detroit's streets or wild parties hosted by Chrysler in the old Firehouse.