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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.

Watch these Super Bowl car commercials [UPDATE]

On Sunday, February 3, the New England Patriots take on the Los Angeles Rams in Super Bowl 53 at Mercedes-Benz Stadium in Atlanta, Georgia. Some will watch because of the storyline of the old-school dynasty facing off against the new-school wunderkinds, but a large chunk of people will solely be watching for the commercials. Lucky for those who slot into the latter category, many of the manufacturers release their super bowl ads ahead of time, or have simply opted to release the commercials only online. Scroll down to see what car companies have already shown their cards. Audi Audi goes the comedic route in its clip for the Big Game. It starts with a grandpa showing his grandson a gorgeous Audi e-tron GT tucked away in a garage before he's shaken awake. Turns out he was just choking on a cashew in his cubicle at his boring job. Dodge Dodge does what it knows: create enough smoke to punch more holes in the ozone layer. Set to "The Devil Went Down to Georgia (the Super Bowl is in Atlanta, get it!?), a Challenger SRT Hellcat widebody, Charger SRT Hellcat, and Durango SRT are seen ripping through a city, leaving a trail of rubber crumbs in their wakes. Genesis Genesis has not yet released a commercial prior to the Super Bowl, but it is the official luxury vehicle of the NFL. Because of this, Genesis is hosting a fan experience for 10 days before the game. It will showcase the brand's cars, offer games, and have photos opportunities and autograph days. Hyundai Jason Bateman alert! Hyundai is one of the few companies to hook a major celebrity for its advertisement, and the casting is perfect. Bateman plays a doorman who takes people to various terrible events in life, including root canals, the middle seat, and shopping for a car. The ad centers around Hyundai's Shopper Assurance, which is Hyundai's new method for car shopping. Jeep An old 1963 Jeep Gladiator finds its strength in the crusher and transforms into a a new 2020 Gladiator, with a firm declaration that the nameplate is officially back. Kia Through Kia's commercial, a young boy wonders out loud what it'd be like if the millions spent on Super Bowl commercials were used to help others.

Autoblog Podcast #318

Toyota back on top, Barrett Jackson, Crowdsourcing your Dodge Dart payments, Nissan and Toyota double down on pickups
Episode #318 of the Autoblog Podcast is here, and this week, Dan Roth, Zach Bowman and Michael Harley talk about Toyota regaining the No. 1 sales crown, getting your friends and family to buy you a Dodge Dart, Barrett-Jackson, and Toyota and Nissan remaining committed to their pickup trucs. We wrap with your questions, and for those of you who hung with us live on our UStream channel, thanks for taking the time. Keep reading for our Q&A module for you to scroll through and follow along, too. Thanks for listening!
Autoblog Podcast #318: