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

Eight-wheeled Eldorado up for Australian auction

The Greatest Cadillac in the World does not reside in Reno, or Gainesville, or the LBC. Or even America. Or even North America.

Driven: BMW i8

When BMW unveiled the Vision EfficientDynamics concept at the 2009 Frankfurt motor show, we wrote: "for our money, it's the first time a major carmaker has really attempted to communicate ‘green' technology in an aesthetic sense." Fast-forward five years and we've swapped the show halls of the IAA for a beauty spot on the north-west coast of Scotland. And, while the car's name has changed to i8, our sentiment towards this genre- and era-defining car remains. Admittedly the production car's design execution hasn't received the universal praise of its concept forebears, but, on a remote outpost of the British Isles, a Protonic Blue i8 couldn't look more exotic.

Driven: Mazda RX-8

The two most obvious elements of its unusual make-up are its rotary engine and rear-hinged rear doors with integral B-pillars. What became clear during our week with the RX-8 was how these two aspects of its design form the basis of many other unique qualities... Sports coupe and GT coupe The rotary engine of the RX-8 has a very distinct power delivery that is a defining part of the car's character, but it is also a very small lump of metal compared to a similarly powerful conventional reciprocating piston engine, enabling more of the car's overall length to be devoted to cabin space.