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Infiniti's new VC-T changes the rules of small turbocharged engines

The upcoming Infiniti QX50 crossover does not get our pulse racing, no matter how shapely the QX Sport Inspiration concept that previews it may be. No midsize SUV does, to be fair. But it has something special under the hood – the world's first production variable-compression-ratio engine. That means the QX50's 2.0-liter turbo four, which makes 268 horsepower and 288 pound-feet of torque, will have up to 27 percent better fuel economy. Here's how it works. The trend of moving to smaller, turbocharged engines carries with it one big falsehood. Under low load when the turbo isn't needed, these engines are less efficient than an equivalent engine without a turbo because of the low compression ratio the turbo requires. That is, if you never need the extra power, you're wasting fuel. Turbocharged (and supercharged) engines use a lower compression ratio to prevent detonation. When you force extra air in a cylinder and mix it with fuel, it's more likely to prematurely go boom. Lowering the compression ratio prevents this problem, but it's less efficient. Infiniti's VC-T promises the best of both worlds, with a compression ratio that ranges from 8.0:1 for high-power turbo needs to a 14.0:1 ratio for fuel-sipping efficiency. At its heart the VC-T engine is a simple idea, but it's complicated to explain. Consider yourself warned. The photo below from Infiniti serves as a good visual overview. For the truly nerdy, this patent application covers the mechanical concept. Instead of having the pistons connected to the crankshaft, Infiniti's engine has a pivot arm with a connection on each end. One end connects to the piston, the other connects to a second lower shaft, which is controlled by an actuator arm. At any given time the engine's pistons move up and down according to the lobes on the crankshaft. But the actuator arm can change the angle of the pivot arm up and down. That is, the pistons still move in the same motion with the same stroke, but phase the entire stroke up or down. Move the pivot up and there's less room at the top, which means a higher compression ratio. Move the pivot down and the compression ratio goes down, too. As an added bonus, the lower shaft eliminates the need for counter-rotating balance shafts. Infiniti says this system works constantly and can vary the compression ratio to any number between 8:1 and 14:1. It also uses electronic variable valve timing on the intake valves to switch into Atkinson-cycle combustion for greater efficiency.

Join Autoblog editors for a full video tour of the 2019 Detroit Auto Show

The 2019 North American International Auto Show might have been a little more quiet than past years, but there were still some pretty major reveals, including the Toyota Supra, new Ford Explorer, Shelby GT500, Subaru WRX STI S209 and Kia Telluride. We also saw some lovely concepts like the Nissan IMs and Lexus LC Convertible. Senior Editor Alex Kierstein, Consumer Editor Jeremy Korzeniewski and Senior Green Editor John Beltz Snyder join me, Associate Editor Reese Counts — with Social Media Manager Michael Dylan Ferrara behind the camera — on a long walk through the show. We discuss cars, poke around the stands, dress a bloody wound and answer your questions in the Facebook comments. For more Detroit coverage, you can check out Autoblog's picks for the best in show, listen to our podcast or look at the best images from all the reveals. Finally, don't forget to watch Editor-in-Chief Greg Migliore hand over our 2019 Technology of the Year award. Related Video: Green Detroit Auto Show Acura Cadillac Chevrolet Ford GM Hyundai Infiniti Kia Lexus Nissan RAM Subaru Toyota Volkswagen Truck Convertible Coupe Crossover Hatchback Minivan/Van SUV Videos Sedan facebook 2019 detroit auto show live

Race Recap: 2013 Korean F1 Grand Prix crazy enough for Psy [spoilers]

The end of qualifying for the 2013 Korean Formula One Grand Prix left us with five pairs: two chassis each from Infiniti Red Bull Racing, Mercedes-AMG Petronas, Lotus, Ferrari and Sauber. Yes, Sauber. The last time the Swiss team had two drivers in the top ten was Japan last year, when Kamui Kobayashi converted the grid spot into a podium.
But let's start at the front of the top ten, where Sebastian Vettel put his Red Bull on pole for the 42nd time in his career. He was followed by Lewis Hamilton in second place by two-tenths of a second, Mark Webber in the second Infiniti Red Bull, and Romain Grosjean in the Lotus in fourth. Out-qualifying teammate Kimi Räikkönen again, the Finn would line up in tenth. Nico Rosberg put the second Mercedes in fifth, Fernando Alonso got the first Ferrari into sixth ahead of teammate Felipe Massa, while Nico Hülkenberg led with the first Sauber in eighth, teammate Esteban Gutiérrez showing the promise he was hired for (okay, and his money) in ninth. Except they'd all move up a place because Webber had to serve his ten-place grid penalty after getting his third reprimand of the season in Singapore. That would get Sergio Perez in his McLaren into tenth. Yes, McLaren needed a grid demotion ahead to make it into the top ten.
It was an entertaining top ten that no one would have expected. When the red lights went out, we were treated to one of the most entertaining races of the year - it was Gangnam Style at 300 kilometers per hour.