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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.

Mitsubishi and Renault-Nissan expand partnership, US will get new sedan

Mitsubishi and Renault-Nissan have just inked an alliance that might, hopefully, reverse the ailing fortunes of the Mitsubishi brand in the US market. The big chunk of news is that Mitsubishi will produce two Renualt-based models for sale in the US market, and that they'll be built at the Renault-Samsung factory in Busan, South Korea.
The plans call for a D-segment sedan to be followed by a C-segment offering. Based on the cars built at the Busan factory, that means Mitsubishi will be getting the SM5 and the SM3, a pair of handsome sedans that are based on Renault-Nissan's D and C platforms, respectively. These same platforms underpin a number of US market Nissans (not to mention a number of cars from Renault), namely the Pathfinder, Maxima, Quest and Murano for the D platform and the last-generation Rogue and Sentra for the C platform.
Besides the sedan production, Nissan and Mitsubishi will be expanding their joint-venture company, NMKV, which produces Kei cars for the Japanese market. A new, all-electric offering will be born from the partnership, likely based on a Kei car platform. The partnership between the three brands will also lead to increased sharing of technology, particularly relating to electric cars.

Carlos Ghosn brings Nissan Leaf EV to happy nation of Bhutan

The Nissan Leaf has been declared the cleanest car in the US, and it's going to have a good case to claim the same title in Bhutan. Yes, Bhutan, the country famous for measuring Gross National Happiness is about to get serious about the EV Grin. Last December, we learned that Bhutan's capital city, Thimphu, wanted to build up a Leaf taxi fleet. That's when Renault-Nissan CEO Carlos Ghosn went to Bhutan to talk about the project and he has recently returned to deliver some vehicles to the Prime Minister of Bhutan, Tshering Tobgay, who has been advocating for EVs since taking office in July and has set a preliminary target of 2,000 EVs on the streets of Thimphu. Tobgay said his country, "will commit to a program to achieve zero emissions as a nation by a certain target date." It's not an outrageous goal for the Himalayan country, since it generates a lot of hydro-electric power, way more than it can use. There are only around 750,000 citizens of Bhutan and they only use five percent of the clean power made within its borders. Most of the rest goes to neighbor India. The problem, as expressed in Nissan's press release (available below), is that Bhutan takes "almost all of the revenue earned from selling electricity" to buy fossil fuel from India and power its national vehicle fleet. You can probably see how making the switch to EVs can simplify and clean things all around. There's a video of Ghosn's Bhutan trip below. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. Nissan Partners with Bhutan on National EV Strategy Feb. 21 – Thimphu, Bhutan – An electric revolution has begun in Bhutan. The remote Himalayan country, renowned for championing "Gross National Happiness," has taken first steps towards becoming a leading global electric-vehicle nation. Prime Ministers of Bhutan, Tshering Tobgay and Nissan CEO, Carlos Ghosn Prime Minister Tshering Tobgay and Nissan CEO Carlos Ghosn announced a partnership in Thimphu Friday, which will see both parties work toward achieving Bhutan's ambitious clean-energy goals. "We will develop a program, we will commit to a program to achieve zero emissions as a nation by a certain target date," said Tobgay who has backed the EV project since taking office in July last year.