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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 Leaf has 2nd-best sales month ever, Chevy Volt does a 2013 repeat [UPDATE]

UPDATE: The official press release says that "Volt [sales were] up 7 percent," but Randy Fox let AutoblogGreen know that this is simply due to a change in the fleet/retail mix between March 2013 and 2014. The actual number sold was exactly the same in the two months. A month ago, Nissan's director of EV sales and marketing, Toby Perry, said he expected to see the Leaf's sales momentum continue into March. It wasn't a big leap, since January and February were slow sales months in 2013 (around 640 each) before a big climb to 2,200 in March. In 2014, the first two months of the year were better (around 1,300 each) but Nissan can still be happy that the Leaf just had the best March ever and its second-highest sales month ever, with 2,507 sold. That's a 12.1 percent increase from 2013 and Perry said in a statement to AutoblogGreen that one reason is all of the buyers who are becoming evangelists for the vehicle. "We've also seen an increase in showroom traffic as we enhanced our marketing presence in March," he said. Nissan pointed to cities like Washington, DC, Raleigh-Durham, NC and urban areas in Texas as strong Leaf markets last month. On the Chevy Volt front, January and February were also slow months in 2014, down roughly half from the 2,000-ish the plug-in hybrid was selling at the end of 2013. For 2014, sales were up slightly from the first two months of the year and Chevy spokesman Randy Fox told AutoblogGreen that the March number was "pretty flat, year-over-year." Even with that warning, we were surprised to see the total come in at 1,478. Why's that? Because the total for March 2013 was ... 1,478. So, yeah, that's pretty steady even if there were 26 selling days in March period this year compared to 27 last year. As always, our more complete report of last month's green car sales will be coming soon. News Source: General Motors, Nissan Green Chevrolet GM Nissan Electric Hybrid PHEV ev sales

Nissan's 'No Charge to Charge' is what incentives look like in the EV age [UPDATE]

Nissan knows that offering free charging can increase Leaf sales, so it only makes sense for them to expand the "No Charge to Charge" program. And that's exactly what happened yesterday. As previewed during the New York Auto Show, No Charge To Charge gives new Leaf buyers free charging at participating public charging stations – which is pretty much any public station – for two years. That's the kind of thing that simplifies the EV buying process, which can move units, Brendan Jones, director of Nissan EV sales and infrastructure, told AutoblogGreen. "There is an expectation that we'll get a sales increase out of this," Jones said. "All the dealer has to say is that we have one card that accesses all chargers and we have a promotion where you can get free charging. The more complexity we reduce, the more sales we get." "The more complexity we reduce, the more sales we get." – Nissan's Brendan Jones That all-access angle is important for the broader EV market, Jones said, calling the program, "The first valid step towards interoperability." Jones said there will be more surprise announcements soon. "The infrastructure companies really came together to support Nissan on this," he said, but added that, "What's good for the industry and EVs in general is good for Nissan." "Leaf customers are not shy about their ability to provide constructive criticism," Jones said, " and interoperability has always been a big concern." Now that many of the early adopters drive an EV, the next target audience are the people who are telling EV companies to "Make this easy for me and I will adopt," Jones said. "[Interoperability] is a necessity for the industry now. We know the experience is great once they drive it. This just takes away a barrier, that confusion at the dealership." And, in some areas in the US, No Charge To Charge is now live. There are 2,600 public stations (200 of them fast chargers) in the initial 10 markets, Nissan says. Those include: San Francisco, Sacramento, San Diego, Seattle, Portland (OR), Nashville, Phoenix, Dallas-Fort Worth, Houston and Washington, DC. Nissan hasn't announced where the next 15 markets will be, but we know that they will likely be wherever the Leaf is selling well and there are a fair number of DC fast chargers. As we reported in April, each charging session in the No Charge To Charge program is limited to 30 minutes if you're plugged into a CHAdeMO fast charge station and to an hour at a Level 2 station.