Choke Thermostat Walker 102-1057 on 2040-parts.com

One Lap of the Web: Chevrolet, Caswell, custom Caterhams, crispy cars

-- Louis Chevrolet -- along with brothers Gaston and Arthur -- were race-car pioneers long before Billy Durant ever made them into the Heartbeat of America. Louis was driving the No. 7 Frontenac when it caught fire at Sheepshead's Bay, Brooklyn, in September of 1919.

New Porsche Macan leaks out

New Porsche Macan leaks out Porsche has been on a mission to raise interest in the new Macan, and we’ve had teaser photos of the Macan and video of the new Macan playing on the sand dunes. Now we get the first undisguised photos. The Macan photos (above) are from Auto Motor und Sport magazine and leaked out online with almost three weeks to go until the Macan gets its official reveal in Los Angeles.

Renault Twin'Run concept

The Renault Twin'Run concept, unveiled during the weekend's Monaco Grand Prix, is the sibling of the Twin'Z collaboration with Ross Lovegrove. Together they fulfill the ‘Play' stage of Renault's ongoing concept car lifecycle. While its overall form is very similar to the Twin'Z's (apologies for awkward punctuation on Renault's behalf), previewing the next-generation, rear-engined Twingo, the ‘Run is altogether racier than the more pragmatic – if no less flamboyant – ‘Z.