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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 Motors halts some SUV sales in Japan as MPG scandal grows

Mitsubishi's fuel-economy scandal is going from bad to worse. First, the Japanese automaker claimed it lied about the fuel economy for a few kei cars, then it claimed fuel economy tests for as far back as 1991 could reveal mile-per-gallon figures that were tampered with. In May the automaker, admitted that every single vehicle it's sold in Japan could be affected by the fuel-economy scandal. Now, the Japanese automaker revealed that more of its vehicles were involved in the fuel-economy cheating scandal – and one of them is sold in the US. After completing its investigation into the automaker's fuel-economy scandal, Japan's Transport Ministry found that Mitsubishi overstated the fuel economy for eight more vehicles in marketing brochures, one of which is sold as the Outlander Sport in the US, reports Automotive News. The Transport Ministry ordered Mitsubishi to stop domestic sales of the models, which include the Pajero, Outlander, and RVR SUV (known as the Outlander Sport in the US). The latest finding adds to four kei cars that were previously noted for having overstated fuel economy figures earlier this year. Japan's sixth-largest automaker is having a hard time recuperating since the scandal broke earlier this April. The initial scandal led to the automaker suspending its sales, which caused a large dip in the automaker's market value. The scandal required Mitsubishi to seek financial assistance from Nissan, which agreed to buy a controlling 34-percent stake for $2.2 billion. Investigators hired by Mitsubishi to look into the automaker's overstated fuel economy figures revealed the company's "corporate culture" as the issue. More specifically, the investigators founds the company's pressure to improve fuel-efficiency figures, a lack of unity between divisions, and an unwillingness to accept fuel economy shortfalls as the reason for falsifying its vehicles' mpg figures. Mitsubishi is expected to compensate Japanese owners for the overstated fuel economy figures, which would result in a massive loss for the automaker. The company is expected to post a net loss of roughly $1.4 billion this year, pushing Mitsubishi into the red for the first time in approximately eight years. Related Video: News Source: Automotive News-sub.req.Image Credit: Tomohiro Ohsumi / Bloomberg via Getty Images Government/Legal Green Mitsubishi Nissan Fuel Efficiency kei car scandal

Nissan Leaf keeps plug-in vehicle sales crown for 6th straight month

And Nissan makes it 14 in a row. For the 14th straight month, the all-electric Leaf has had "record sales," according to Nissan's marketing team. What that means is that for that particular month (in this case, April) no matter what year you look at, the car sold more than it ever did before. For April 2014, the 2,088 Leafs sold represents a 7.8-percent increase from 2013. Nissan's director of EV sales and marketing, Toby Perry, said in a statement that the "new market" of Cincinnati made the top 25 list for Leaf sales areas in April, so the car's popularity continues to ebb and flow across the US. Over at Chevy, the Volt sold 1,548 units in April, reaching a year-to-date total of 5,154. The Leaf is outpacing that with 7,272 YTD sales. In 2013, the Volt outsold the Leaf by about 500 vehicles, but Leaf sales are up 33 percent year-over-year while Volt is down 7.1 percent. The Leaf has also outsold the Volt for six straight months. But we're excited for every eco-car sale, and that's why we'll have our monthly detailed write-up of the rest of the plug-ins, hybrids and diesel vehicles available soon. Until then, discuss. Green Chevrolet Nissan Electric Hybrid PHEV ev sales