Arias Pistons 12.5:1 Compression 82mm Bore Honda B-series on 2040-parts.com

Chrysler's new problem is a shortage of vehicles

A two-month factory shutdown and the cash-for-clunkers government rebates accomplished a feat that had eluded Chrysler Group: It turned several slow-selling vehicles into scarce commodities. At the end of July, Chrysler had only a seven days' supply of Jeep Patriots, or 2,200 units, in dealer stocks. Sixty days is considered normal.

Four million drivers aged over 70

THE NUMBER of people aged over 70 who hold driving licences has exceeded four million for the first time, according to the RAC Foundation. The oldest licence holder is a 107-year-old woman, while there are 191 people aged over 100 who have licences. Once people reach 70 they must declare whether or not they are fit to drive every three years, without having to take a driving or medical examination.

One Lap of the Web: Cool classic concepts, Rat Pack Cadillacs and even more Vin Diesel

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. -- Petrolicious brings us an awesome VWvortex forum thread packed with prototype photos, design proposals and concept sketches of everything from the Iso Grifo to the 1994 Mustang.