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

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.

BMW Zagato Roadster

BMW and Zagato turned heads at the 2012 Pebble Beach Concours d'Elegance with its latest collaboration: The BMW Zagato roadster, just months after the unveil of the unveil of their coupé at Villa d'Este. The car, developed in just six months, features a low-set kidney grille – complete with tiny matt-sheen Zagato 'Z' letters – and circular headlamps on a sharply lined contoured hood, while Zagato's signature double-bubble design is seen again on the car and serves to extend the lines of the hood to the rear. Like the coupé version it is again the work of Norihiko Harada, Zagato's Chief Designer.

RenaultSport Clio 200: Paris 2012

Renault has unveiled the Clio RenaultSport 200 at the Paris Motor Show with a 1.6 litre turbo engine delivering 200bhp. The latest version of the Clio RS forgoes its naturally aspirated 2.0 litre engine for a turbo 1.6 litre delivering the same 200bhp but more torque – up more than 10 per cent. What dropping the 1.6 turbo has done to the Clio is make it more economical – Renault say it is 25 per cent more fuel efficient and, obviously, emissions drop comparably.