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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 recalls 226k vehicles over airbag inflators

Nissan and Infiniti are the latest automakers to issue recalls involving faulty airbag inflators from Takata. The Japanese automakers have announced campaigns covering about 226,326 units from seven models built in the early 2000s because they contain the bad part in the passenger-side, front airbag. The affected vehicles include the 2002-2004 Nissan Sentra, 2002-2003 Pathfinder and 2002-2003 Maxima, and it also covers the 2002-2003 Infiniti QX4, 2002-2003 I35, 2003 FX45 and 2003 FX35.
Like the other vehicles with the faulty inflators, it's possible for the part to rupture during airbag deployment and spray metal shrapnel at occupants. Nissan and Infiniti have even included vehicles with replacement airbags in this campaign because those parts also could have been defective. Both companies were also part of the earlier regional campaign to fix cars in high-humidity climates where the problem has been found to be the worst.
As is the usual response, Nissan and Infiniti will notify owners of the affected vehicles and will make the repair at no charge. According to the filing with the National Highway Traffic Safety Administration, these fixes will commence around August 11. Scroll down to read the report from NHTSA, or read the full defect notice as a PDF, here.

Recharge Wrap-up: Infiniti PHEV, free biodiesel?

In certain cases, biodiesel is so inexpensive that it is essentially free to use. Thanks to the decline of crude oil prices, other fuels, including biodiesel, have been following the trend. After setting new renewable fuel mandates, Congress also reinstated a $1-per-gallon tax credit for refiners. With such low prices, Midwest refiners are paying as low as $0.645 per gallon. In California, however, additional incentives mean some customers could get money back on the biodiesel they use, depending on the deals between producers and blenders and whether or not they share the credits. Read more from Ag Web. Infiniti is considering adding plug-in hybrid technology to its vehicle lineup. Infiniti CEO Roland Krueger says that it will leverage the EV expertise from Nissan for the electrification of its cars. Don't hold out for a luxury version of the Leaf wearing an Infiniti badge, though. When asked if an all-electric Infiniti were out of the questions, Krueger says, "Performance and the range are very important in the premium segment, so we believe that for Infiniti a hybrid or plug-in hybrid is the right proposition at this time." Read more from Automotive News Europe. Hyundai Tucson Fuel Cell drivers in California have logged a cumulative 1 million miles. With nearly 100 Tucson Fuel Cells sold so far in Southern California, these drivers have prevented some 385 tons of CO2 emissions. "Breaking the seven-figure consumer mileage barrier gives us new vision into the unlimited zero-emissions potential for Hyundai's fuel cell vehicles," says Hyundai's Mike O'Brien. "With our growing fleet of hydrogen-powered Tucson fuel cell vehicles accumulating one million miles this quickly, one can only imagine the unlimited potential for a zero-emissions hydrogen vehicle future." Read more in the press release below. Hyundai Tucson Fuel Cell Drivers Accumulate More Than One Million Zero-Emission Miles Cumulative Zero-emissions Miles by Southern California Fuel Cell Drivers Breaches the Seven-Figure Mileage Barrier Fuel Cell clean H2O emissions effectively replaced approximately 385 Tons of CO2 emissions compared with gasoline vehicles of similar size FOUNTAIN VALLEY, Calif., Feb.