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

Great British cars immortalised on Royal Mail stamps

Throughout the 20th century a series of great British cars have put their stamp on the world, now the Royal Mail has put some of these iconic motors on stamps. The Auto Legends stamp collection celebrates the six thoroughbred British cars that led the world with their artistry and engineering. Alongside them are four workhorses that may have been less celebrated but have still done more than their fair share to further the British car industry’s cause over the years.

2014 Porsche Cayman gets a performance-testing iPhone app

To promote the new 2014 Cayman, Porsche has cooked up an iPhone app called “Cayman Code of the Curve.” You're probably already rolling your eyes at the prospect of another automaker app that is little more than a downloadable advertisement, but this seems to be something different -- the app is designed to record your driving performance in real-time and then share results with friends. Porsche enthusiast site flatsixes.com has an exclusive first look at the app, which is still in development but is reported to be coming “soon.” Based on preliminary screenshots provided by Porsche, the app instructs users to set up a variety of courses -- cone slalom, autocross and reaction-time challenge courses are shown -- then uses the iPhone's internal accelerometer and GPS receiver to track and record your performance. You'll also be able to use the app's “record your curve” function to share favorite drives with friends on Facebook.

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.