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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.

Since 2010, Chevy Volt has outsold Nissan Leaf by just two units

The first two plug-in vehicles from major automakers in the US were the Chevy Volt and the Nissan Leaf. Ever since they went on sale to much fanfare in late 2010, we've been tracking the monthly sales with great interest (and, of course, other green vehicle sales as well). After a big initial lead by the Volt – the Volt outsold the Leaf 23,461 to 9,819 in 2012 – the Leaf has been chugging along and outsold the Volt every month since November 2013. We knew that the cumulative totals would soon tip in favor of the Leaf, but for at least one more month, the Volt is going to be able to say its the most popular plug-in vehicle in the US. Overall, for all officially reported sales of the Leaf and the Volt, things are almost exactly tied. Since the vehicles went on sale in the end of 2010 until the end of February 2015, the Volt has sold 74,592 units and the Leaf has sold ... drumroll please ... 74,590 units. For February, Leaf sales totaled 1,198 units, a 17-percent drop from the 1,425 Leafs sold last February. Brendan Jones, Nissan's director of Electric Vehicle Sales and Infrastructure, said in a statement that, "Tough winter weather in several key markets held EV sales back in February. As we head into spring, we look forward to seeing more dealership traffic so shoppers can experience firsthand the benefits of the all-electric Nissan Leaf." Of course, it was cold in the US last February, too, but we're sure that the nasty weather did indeed play a role last month. Things were even worse for the Chevy Volt, which dropped to just 693 copies sold, down 47 percent from the 1,210 sold last year. That's just barely enough for Chevy to keep talking about its plug-in sales leadership, but we expect the message to change once the March numbers come out next month. Related Video:

Suppliers love Toyota and Honda: Why that matters to you

You might think that a survey of automotive suppliers and their relationship with OEMs is the automotive equivalent of nerd prom. In some ways that's what the North American Automotive OEM-Supplier Working Relations Index (WRI) is. The study, the 17th annual conducted by Planning Perspectives Inc., is based on input from 652 salespeople from 108 Tier One suppliers, or, PPI points out, 40 of the top 50 automotive suppliers in North America. Suppliers to General Motors, Ford, FCA, Toyota, Honda, and Nissan. But the results have consequences in terms of tens of millions of dollars for OEMs - and in the quality, technology, and cost of the next vehicle you buy. There are a couple of ways to look at the results of the WRI. One is, "So what else is new?" And the other is, "Damn! How did that happen?" The study looks at five relationship areas — OEM Supplier Relationship; OEM Communication; OEM Help; OEM Hindrance; Supplier Profit Opportunity — within six purchasing areas — Body-in-White; Chassis; Electrical/Electronics; Exterior; Interior; Powertrain. In the overall rankings, Toyota is on top for the 15 th time in 17 years, with a score of 328. Honda, the only company to best Toyota (in 2009 and 2010), comes in second, at 319. Those two companies, explains John Henke, president of PPI, have collaborative working arrangements with colleagues and suppliers alike built into the very fabric of their cultures. This, however, is not a situation where one can readily conclude it is about "Japanese companies," because the third company with headquarters on the island of Honshu, Nissan, came in dead last. This is the "How did that happen?" portion. The Nissan score of 203 puts it 125 points behind Toyota. There hasn't been a number that low since the then-Chrysler Corp. scored 187 in 2010, when the company was clawing its way out of the recession. Clearly, the suppliers don't feel particularly engaged by the buyers at Nissan. Henke explains that whether a company does well or not on the WRI is rather simple. All people do things based on what they're measured on. "If you're measured on taking 10% out of your annual buy, you immediately know how to do it. But if you're also measured on improving relations, suddenly there is a new dynamic as to what you can do to achieve both.