Vintage Kart 101 Pistons on 2040-parts.com

Nissan Juke-R: What happens when a GT-R and a crossover get too cozy

Shoehorning a twin-turbo V6 from a Nissan GT-R into the little Juke crossover--that's the type of craziness we've come to expect to show up at the annual SEMA show in Las Vegas. But Nissan's not waiting for SEMA. Its European tech center has performed the powertrain transplant, with the help of race team Ray Mallock Ltd., to create the Juke-R.

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.

One Lap of the Web: Cop-car guide, an inside look at Morgan Motors and the best hybrid cars

We spend a lot of time on the Internet -- pretty much whenever we're not driving, writing about or working on cars. Since there's more out there than we'd ever be able to cover, here's our daily digest of car stuff on the Web you may not otherwise have heard about. -- Just when we think everything is going smoothly when we're driving, those flashing lights pull up behind us.