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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.

Nissan Murano hybrid greens up Shanghai

Nothing says summertime like a muscle car with a ragtop. Or, in China's case, a hybrid crossover SUV, right? So it's a good thing Nissan plans on starting sales of a hybrid variant of its Murano in China for the upcoming warm weather season. Nissan showed off the Murano Hybrid at the Shanghai Motor Show with a supercharged engine that is paired with an electric motor. The company says the powertrain will deliver the fuel economy of a 2.0-liter engine and the power of a 3.5-liter V6 engine. Nissan didn't release actual specs of the engine nor any fuel-economy figures. Back in 2013, Nissan was working on expanding its hybrid choices, including hybrid variants for both the Murano and the Rogue. This powertrain choice makes some sense, since it could be difficult to wring a decent single-charge range out of those relatively heavier vehicles if they were all-electric. With that in mind, take a look at Nissan's press release below. NISSAN APPEALS TO CHINESE WITH TWO WORLD PREMIERES: LANNIA AND MURANO HYBRID AT AUTO SHANGHAI 2015 Lannia makes global debut to capture the hearts of young Chinese customers All-new Murano Hybrid offers excellent fuel economy and driving performance in the luxury SUV segment Customers in China can begin ordering GT-R Nismo and 370Z Nismo today SHANGHAI, China (April 20, 2015) – Nissan unveiled two all-new production models, Lannia and Murano Hybrid, along with two Nismo products, GT-R Nismo and 370Z Nismo, at Auto Shanghai 2015. "These innovative vehicles represent the start of an exciting new chapter in the story of Nissan's presence in, and commitment to, China," said Nissan President and CEO Carlos Ghosn. "Nissan's growth strategy in China will continue to reflect our commitment to use local engineering and manufacturing. And we will maintain our support for China's efforts to promote more efficient and sustainable transportation. On both of these fronts, Lannia and Murano Hybrid will lead the way forward." Highlights of the Nissan display: Building on Nissan's longstanding success in the sedan market, Lannia delivers a fresh, distinctive personality that China's young generations embody. As the first product developed and designed for the young Chinese generations, especially those in their 20s and 30s today who are seen as energetic trendsetters, Lannia is a tangible expression of the company's commitment to China.

2020 Colorado Winter Driver's Notes | Behind the Wheel S02 // E12

2020 Mercedes-AMG GLC 63 I’ve had bad luck with SUVs this winter. Especially performance ones. First, I got a 2019 Range Rover Sport SVR delivered on summers right as two feet of snow fell, rendering it undriveable. Then, coronavirus cancelled Easter Jeep Safari as well as my trip out to Moab in the 2020 Jeep Wrangler Rubicon Diesel. Thankfully, when this 469 horsepower luxury mall crawler was dropped off, the sun shone down and the snow (mostly) held off.  The first thing that I noticed was there were a few blank buttons throughout the cabin, something that you may see in an entry model vehicle, but IÂ’m not accustomed to seeing in an AMG. Not a great look for a vehicle with an $80,000 price tag. Thankfully that was where the disappointment ended. As soon as you press the start button, the engine fires up and the exhaust note is incredible. Hopping on the highway ramp near my house, I floored it, and the biturbo V8 had me pressed back into the driver's seat, and this wasnÂ’t even the S version that our staff drove last year. Inside and out, the GLC 63 was everything youÂ’d expect from Mercedes. The interior was immaculate, and while the infotainment wheel and touch pad may take some getting used to for someone who isnÂ’t familiar, by now I have it down so that I can use it without looking. And while the V8 left me smiling ear to ear, I was most impressed by the amount of useable interior space there is. I happened to be moving at the time of this review and while all of my large furniture was shoved into the back of a moving van, I was able to fit almost everything else in the back of the GLC. 2019 and 2020 Fiat 500X Trekking ItÂ’s hard to say goodbye to an AMG and then turn around and be excited when a Fiat 500X pulls in your driveway (I know, I know, automotive journalist problems). That being said, when the red Fiat pulled up, I found myself admiring it. I am very familiar with the 500X. Back in 2016 Autoblog had one for a year as our long term test vehicle. I drove that car everywhere, multiple trips up north in Michigan, and even tracked it at Gingerman Raceway for a few laps before the brakes started smoking.  The 2019 model I had in my driveway and the 2020 model I drove in the snow up in the mountains feel very similar to that car. The interior is stylish and surprisingly roomy. The greenhouse is airy.