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

Mercedes unveils powerful new AMG 4.0-litre twin-turbo V8

By John Mahoney Motor Industry 25 July 2014 17:09 Mercedes AMG has released details of an all-new 503bhp 4.0-litre twin-turbo V8 that will help fill the void when the production of its normally aspirated 6.2-litre V8 ends. Lightweight, compact and more efficient than the big 6.2-litre it replaces, the new smaller capacity turbocharged V8 produces 479lb ft from just 1750rpm. The first car to receive the new engine will be the Porsche 911-rivalling Mercedes AMG GT, but other smaller cars like the C63 AMG are also set to benefit from its compact design.

Alfa Romeo 4C in action at the Goodwood Festival of Speed (video)

The Alfa Romeo 4C made its dynamic debut (pictured) at the 2013 Goodwood Festival of Speed The long awaited Alfa Romeo 4C finally made its debut in production spec at the Geneva Motor Show in March, and at the weekend the 4C made its dynamic debut at the Goodwood Festival of Speed. To make sure the 4C made as big an impact as possible at Goodwood, we’d expected Alfa to run up the hillclimb in the launch edition 4C, which gets plenty of extra goodies including a carbon fibre body kit and spoiler, but this 4C looked to be a standard model. But even though we’d like to have seen the launch edition with its extra carbon fibre goodies, the standard car gets exactly the same 1750cc 4-cylinder petrol engine with enough get up and go, 236bhp, to move the lightweight 4C (under 900kg) to 62mph in just 4.5 seconds.

Video: Adrian van Hooydonk on the BMW 4-Series Coupe concept

BMW's Director of Design Adrian van Hooydonk explains the design strategy behind the 4-Series Coupe concept's design in a video interview filmed at the car's reveal at the Munich Design Night. He talks us through how the design team played with the wheelbase length to create new shapes and convey a sense of "elegance and power". Check out the full story and gallery of the BMW 4-Series Coupe concept for more information on the car that will replace the 3 Series coupe.