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

Chevrolet Volt chief leaves GM

A key driver of the Chevrolet Volt project is defecting to start his own consulting firm, according to published reports. Volt chief Bob Kruse, 50, has left General Motors. He's been replaced by GM engineering veteran Micky Bly, who has also been involved with development of the Volt.

Renault Initiale Paris stars at the 2013 Frankfurt Motor Show

It may seem like a strange idea for Renault to launch its Initiale Paris premium sub-brand at a German motor show, but it could turn out to be quite an astute move. The French brand is hoping to take on the Germans with Initiale Paris, so showcasing this rather wonderful concept in Frankfurt is a clear signal of intent. Renault says this Initiale Paris concept previews the next generation Espace, but we can't help but see a massive dollop of Renault Avantime when we take a wander around the car.

Vuhl 05 is a Mexican Ariel Atom – costs from £66,000

The Vuhl 05 (pictured), track-focused road car, has been revealed The Vuhl 05 – which has been teased recently – was unveiled this afternoon in London as Mexico’s answer to the Ariel Atom. The Vuhl 05 uses a bonded monocoque with honeycomb panels and aluminium covered on plastic panels to keep weight down to just 695kg. That means that even though the Vuhl 05 has only 285bhp available from its mid-mounted 2.0 litre turbo Ford EcoBoost engine, it can still get to 62mph in 3.7 seconds thanks to a power to weight ratio of 400bhp per tonne.