One lap of the Web: $52 million Ferrari 250 GTO, Alfa Romeo Montreal for sale and more bizarro engines

-- Even as the hammer fell on Juan Manuel Fangio's $30 million Mercedes-Benz W196R, we knew that that car wasn't the most expensive one ever sold -- it was merely the most expensive car sold at auction. Other cars were reported to have traded for a bit more in private sales. But now we have word of a car that absolutely blows the sale price of Fangio's little Silver Arrow out of the water: a 1963 Ferrari 250 GTO that sold to an undisclosed buyer for $52 million. We're not even sure what to say about that one, except that it's a pretty car.

-- Are you as in love with the Alfa Romeo Montreal as we are? Here's your chance to throw caution and sound finances to the wind and act on your passion: Bring a Trailer is featuring one for sale in the Netherlands. Unfortunately the car is gold, not brown, but you can barely see the exterior of the car from behind the wheel and you can't see it at all when it's in your mechanic's garage.

-- Wired's Damon Lavrinc, the guy who has pledged to ride (almost) nothing but a Zero electric motorcycle for six months, has put together a gallery of 10 of the the coolest custom bikes of 2013. Whether you're into scramblers, cafe racers or creations that defy easy classification, it seems like there's never been a better time to check out the works of some of the world's most inventive custom motorcycle builders.

-- Napier Deltic diesels not sating your unconventional motor cravings? Here's a look at six modern unconventional engine prototypes courtesy of Popular Mechanics. Though the article is over a year old, we're still not living in the sleeve valve renaissance. But who knows -- one of these seemingly strange powerplants could be under the hood (or in the trunk) of the fuel-sipping eco-mobile of tomorrow.

By Graham Kozak