Harley Davidson Retaining Ring, 47510-80 on 2040-parts.com

Volvo 13-liter liquefied-natural-gas engine announced for North America

It comes as no surprise that, with rising fuel costs, companies are continuing their efforts to increase efficiency. Volvo Trucks, for its part, plans to launch a 13-liter liquefied-natural-gas engine for North America in 2014 and is set to develop a new form natural-gas fuel called DME, or dimethyl ether. Volvo looks to add the liquefied-natural-gas option to complement its compressed-natural-gas (CNG) offerings.

McLaren MP4-12C Can-Am (2012) racer revealed

McLaren will show this MP4-12C Can-Am racing car at the Pebble Beach Concours d'Elegance in August 2012. It's only a one-off design study at the moment, says McLaren, but the Can-Am racer could morph into an off-the-shelf racer for well-heeled enthusiasts keen to take their racing seriously - if there's enough interest. What are the specs of the McLaren MP4-12C Can-Am racer?

The Porsche P1 is lighter, greener and more exclusive than McLaren's new hypercar

Long before the legendary Porsche 911 -- before, even, the Porsche 356 -- Ferdinand Porsche was tinkering with alternative powertrains and designing road-worthy vehicles. Though it wasn't the first vehicle to bear his name, the “Egger-Lohner electric vehicle, C.2 Phaeton model” was the earliest result of his efforts. Perhaps getting the jump on the modern alpha-numeric craze/plague, it was shortened to a simple “P1.” The P1 (we'll refer to it as the Porsche P1 from here on out to avoid confusion) made its first appearance in Vienna on June 26, 1898, and it didn't last long in the public eye: Before Porsche decided to pull it out and put it on display, it had reportedly been sitting in a warehouse, untouched, since 1902.