Pontiac 400 Valve Covers 1968-1970. on 2040-parts.com

ZF boss thinks 9 speeds is enough for transmissions

The nine-speed transmission might be where the race to add gears ends, ZF Friedrichshafen CEO Stefan Sommer said. He referred to nine speeds as the "natural limit" because going beyond that number adds weight and complexity that cannot be offset by gains in fuel efficiency. "There is no hard line, but you have to consider the law of diminishing returns.

Mercedes-Benz C63 AMG coupe revealed

Mercedes-Benz has followed up the debut of the C-class coupe at the Geneva motor show with the unveiling of this new range-topping version, the C63 AMG coupe. Set to land in North American showrooms in September following a planned debut at next month's New York auto show, the new BMW M3-challenger receives the same updated mechanical package as the recently facelifted C63 AMG sedan. It will be sold from the outset as a 2012-model-year car.

Renault Twizy Cargo turns the Twizy EV in to a van

The Renault Twizy Cargo (pictured) turns the Twizy EV in to a small van. If only the Renault Twizy EV was a sensible price, it would make a perfect commuter car. With dimensions that give it a footprint not much more than a motor cycle, the Twizy offers much for commuters in congested urban areas.