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

Citroen Tubik concept

Citroen has revealed the Tubik,  a large upright MPV concept which draws on the French automaker's previous Tub van from the late 1930s. The surface language of the MPV - the car doubles as both a commercial van and a people carrier - is decidedly more technical than previous Citroen concepts, but it still sports a resolutely rounded aesthetic. Its front face draws heavily on the 1948 Type H van, which was built up through to the 1980s.

EPA rules greenhouse gases pose danger; more regulation expected

The EPA has proposed a finding that greenhouse gases from new vehicles and industrial plants pose a danger to the public, kicking off a process that could result in tighter regulation of carbon dioxide emissions. The EPA's findings come two years after the U.S. Supreme Court ordered the agency to determine whether these emissions contribute to harmful air pollution under the Clean Air Act or whether the science is too uncertain.

Le Mans 24-hour race 2010: CAR's guide to the classes

This year, teams are split into two categories: Prototype and Grand Touring. The former are cars created specifically for endurance racing, the latter are homologated from road cars. Each category is then split into two further disciplines – one a higher performance grade, the other slightly lower.