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

Why official car CO2 emissions are a lie

Car CO2 Emissions - an even bigger lie than official economy figures Motorists buy cars based on, and are taxed on, their CO2 emissions. But the CO2 emissions are as big a lie as the official economy figures. We’ve banged on forever about official economy and emission figures and how misleading they are.

Peugeot Onyx concept [w/Gallery]

Peugeot has previewed its Onyx concept, set to debut at this month's Paris motor show, just days after the first teaser images were released. Very much a supercar in terms of its proportions and form, the Onyx is not the first time Peugeot's previewed super and super-sports cars in concept form, but the Onyx looks a lot more promising than previous efforts, from these photos at least. Conforming to the modern, eco-conscious supercar norm, the Onyx features a hybrid drivetrain - following in the footsteps of the BMW i8, Honda NSX and Jaguar CX-75.  Peugeot's stated aim is to push itself upmarket and become a more premium brand, so the Onyx could be read as a sign that the company feels it needs more of a 'halo' car in order to achieve that aim.

Mercedes AMG GT gets new 503 bhp Twin-Turbo 4.0 litre V8 (video)

The new Mercedes AMG GT (pictured) gets the new 503 bhp Twin-Turbo 4.0 litre V8 We’ve speculated that the new Mercedes AMG GT – and, for that matter, futures ’63′ AMGs – will get a new twin-turbo V8 to provide the power as Mercedes look to move away from the naturally aspirated 6.2 litre V8 in cars like the SLS. And this is it. A new 4.0 litre twin-turbo V8 – the M178 engine – has been developed to replace the 6.2 litre V8 and, in initial tune, develops 503 bhp at 6250 rpm and 479lb/ft of torque from just 1750 rpm.