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

Ariel Atom 3.5 (2012) first official pictures

It's difficult for Ariel to come up with a mid-life refresh for its cars - there simply aren't that many bits to fiddle with in the first place. Still, the boys from Somerset must have succeeded, because what we have here is the freshly updated Ariel Atom 3.5. As the name suggests, it's a development of the Ariel Atom 3, with a crop of minor visual  tweaks and some mechanical changes too, keeping Caterham and BAC looking over their shoulders.

Henrik Fisker resigns from Fisker Automotive

Henrik Fisker, founder and executive chairman of struggling plug-in hybrid vehicle maker Fisker Automotive, has resigned. In an email today to Automotive News, Henrik Fisker, referring to himself in the third person, said: "The main reasons for his resignation are several major disagreements that Henrik Fisker has with the Fisker Automotive executive management on the business strategy." Fisker confirmed his resignation in a phone interview and declined to comment further. Tony Posawatz, who became president and CEO of the company in August, said this morning that he had just been made aware of the resignation.

Audi preps S3 Cabriolet for Geneva

Audi revealed the S3 Cabriolet on Wednesday, before its Geneva motor show debut. The go-fast version of the small A3 Cab shares the same widespread MQB architecture as the rest of the 3 range, but it gets a hotter engine, a lower stance and, of course, a rag top. It’ll arrive in Germany this summer, and possibly here sometime after the S3 sedan in early 2015.