Detroit Marine Diesel Engine 8v149 on 2040-parts.com

AutoWeek office swag: Mazda rotary-engine keychain with realistic motion

When I got the keys to our long-term 2011 Mazda 5 last week, they came with a surprise--this aluminum-and-brass keychain in the shape of a rotary-engine housing, complete with moving rotor. The rotor doesn't just rattle around or spin in a circle. Thanks to a thumbwheel on the back of the housing, coupled with a timing gear and offset crank journal, the thing actually moves in an approximation of epitrochoidal motion just like a real Wankel.

BMW ActiveHybrid X6 – blink and you’ll have missed it

BMW ActiveHybrid X6 ends production On the face of it, adding hybrid gubbins to an expensive SUV should be a winner. Extra power and better economy – with the extra cost easily lost in an already expensive SUV – makes some sense. Or at least BMW thought so when the BMW AciveHybrid X6 was launched in 2009.

Best of the Best for 2012: Audi A7 and Land Rover Range Rover Evoque

Each year, hundreds of new cars and trucks pass through the Autoweek garage for evaluation by our editors. We bring our enthusiast eye to what we'll admit is a relatively enjoyable task of sorting through all of those test cars, looking for those few stellar models that deserve additional consideration for our top honors. For the second consecutive year, we've applied all of that accumulated knowledge and seat time to pick Autoweek's Best of the Best/Car and Best of the Best/Truck for 2012.