Horstman Aluminum 2 Piece Sprocket- 35 Pitch - 81 Teeth on 2040-parts.com

One Lap of the Web: KERS, Klass and autonomous 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. -- KERS, the kinetic-energy-recovery system, was first seen in Formula One a few years back.

BMW X3 gets a turbo four-cylinder

BMW is expanding the use of its N20 turbocharged four-cylinder engine by making it the base powerplant for the 2013 X3 SUV. The X3 xDrive28 will use the twin-scroll turbocharged 2.0-liter engine that produces 240 hp and 260 lb-ft of torque. Twin-scroll turbocharging means that the exhaust stream of cylinders one and four follow a separate path to the turbine wheel from cylinders two and three.

Tiff Needell compares the 911 and F-Type

It was a mere matter of time before somebody pitted the new Jaguar F-Type against a flat-six-powered automobile from Stuttgart. And while our natural inclination would've been to choose the mid-engined, two-seat Boxster S to mash heads with the 380-horse V6 S model, the lads at Evo had Tiff Needell compare the new Jag to a 911 Carrera Cabriolet. The heavier Neunelfer is a closer power/weight match to the F-Type.