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

Porsche Battery – a mere £1200

The rather expensive Porsche Lithium Ion Battery Car batteries have been roughly the same shape and size – and utilised basically the same lead-acid technology – for years. They’ve got better, as you no longer need to top them up with distilled water at regular intervals (I’m showing my age now), and they are less prone to going flat. But that probably has more to do with alternators replacing dynamos than the batteries themselves.

Make like a tree and Leaf: We drive Nissan's coming electric vehicle

From behind the wheel, the production version of the Nissan Leaf electric car is smooth and silent, feels nearly friction-free and offers all the prodigious torque inherent in an electric car. That's what we found after a short drive around Dodger Stadium in Los Angeles on Friday. The body you see in the photo is a Versa.

Porsche Macan to get a bolder look before launch

The Porsche Macan – the baby Cayenne – is to get a new, bold look before it launches in 2014, to make it better able to compete against the Range Rover Evoque. The Porsche Macan, Porsche’s baby Cayenne based on the underpinnings of the Audi Q5, is a big deal for Porsche. Having discovered that an SUV could revive their fortunes after they launched the Cayenne a decade ago, the smaller, lower-priced Macan should give both Porsche’s sales and profits a big boost.