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

CAR scoop: BMW and Toyota's joint sports car plot

BMW is buddying up with Toyota on an all-new sports car platform, set to underpin the replacements for the Z4, 6-series and GT86. The unlikely collaboration stems from an alliance that began in 2011, where BMW and Toyota agreed to co-develop next-generation lithium ion batteries, and for Toyota to use BMW’s fourpot diesels in its European cars. An engineering team is beavering away on the project, with the clock ticking: the suits want to outline the car’s specification before the end of 2013. What does BMW get out of the bargain?

Vauxhall Ampera: Try for 30 days – and then give it back

Vauxhall are offering buyers of the range extender Ampera the chance to buy risk free for 30 days and return the Ampera. So in an effort to get more car buyers looking seriously at the Vauxhall Ampera range-extender, Vauxhall have come up with a scheme to allow Ampera buyers to grab a new Ampera, try it for 30 days and then give it back if they don’t get on with it. It’s a clever scheme, because the Ampera is a good car.

Electric cars can become electricity banks

Ever try to store electricity? It won't stay in a bottle, and you can't keep it in your sock drawer. So when you have a lot of it--say, when it's windy and your wind turbines are really spinning, or when it's sunny and your gallium arsenide photovoltaics are lighting up, or at night when the utility's generators can run unhindered--you have to store it somewhere.