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

Porsche Macan to get VW 4-cylinder engines in 2014

The new Porsche Macan (pictured) will get 4-cylinder engine options in 2014 The new Porsche Macan arrived officially just a few weeks ago, complete with a choice of six-cylinder petrol and diesel engines and prices starting at £43k. But that’s just the start. Porsche has now confirmed that, before the end of 2014, the Macan will get some more affordable engine options with both petrol and diesel 4-cylinder engines finding their way under the Macan’s Cayenne-esque bonnet.

Mazda 3 hatchback (2013) at Frankfurt motor show

The Mazda 3 is back: lighter, more eco-friendly and supposedly better to drive than ever, promises Mazda. Brought up-to-date with Mazda’s new ‘Kodo’ design style from the 6 saloon and CX-5 crossover, the new Mazda 3 is a handsome hatchback, and boasts a far superior cabin to its predecessor. Is that enough to shoehorn buyers out of the VW Golf and Ford Focus? Get the full CAR story here.

London's GPS-based speed-limit trial puts Big Brother's foot on the gas pedal

A fleet of 12 Toyota Priuses in London have been fitted with GPS-linked speed limiters to measure how drivers respond to having their speed controlled by a computer rather than their own feet. For now, the trial is local to London, run by Transport for London, the agency that manages the city's roads, buses, subways and trains. The agency is using its own fleet of Priuses for the test and will add a bus and a taxi later this year.