2003 Nissan Murano on 2040-cars

Auto blog

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 Bladeglider now on the backburner

There have been some big shakeups within Nissan's top executive ranks in the past 12 months, including Johan de Nyscchen leaving Infiniti to run Cadillac and Andy Palmer taking over Aston Martin. With them gone, the automaker's future product portfolio looks to be shifting as well. Among them, the chances are dwindling for the BladeGlider to actually arrive in dealers – already a rumored possibility. New Nissan planning boss Philippe Klein isn't nearly as hot on the idea of the BladeGlider as his predecessors. Where Palmer said last year the vehicle was in the brand's mid-term plan, Klein recently told Autocar that the model was "not among the immediate priorities." He didn't slam the door entirely on potential production, though. "It is still on the table, but at the end of the day it has to make sense to the company." Debuting at the 2013 Tokyo Motor Show, the BladeGlider translated the narrow-front, wide-rear wedge shape of the Deltawing and ZEOD RC racers to the street. In concept form, it used an electric drivetrain with hub-mounted motors, and the driver sat in the center with two passengers flanking them to the rear. According to Autocar, the project to develop a production version got at least as far as creating test cars from Ariel Atoms. The BladeGlider's renegade styling hasn't been the only thing holding it back from seeing the road, though. Panoz has a pending lawsuit against Nissan that claims the styling for the Nissan ZEOD RC and the BladeGlider infringe on the intellectual property for the Deltawing's design.

Nissan Leaf ends 2013 with best sales month ever, but can't catch Chevy Volt

Nissan and Chevrolet both ended 2013 with solid sales figures for their plug-in vehicles, the first two that were released (all the way back at the end of 2010) from major automakers. As has been the story for most of 2013, December sales for the Nissan Leaf and the Chevy Volt were roughly the same. When we left the year-to-date running tally at the end of November, the Volt was at 20,702, while the Leaf was at 20,080. As you can tell from the image above (if you've been noticing the trend in these EV sales monthly flash-reports), the Leaf outsold the Volt, but was it enough to put the Nissan on top for the year? In 2013, Nissan sold 22,610 Leafs, more than twice as many as in 2012. Almost. The Leaf made a valiant attempt, and did have its best month ever with 2,529 units sold. That means that for 2013, Nissan moved a total of 22,610 Leafs, more than twice as many as in 2012 (that year, Nissan sold only 9,819 Leafs in the US) and actually more than 2012 and 2011 Leaf sales combined (which was 19,493). Nissan continues to see the effects of its price drop and expanded sales areas, with Georgia rapidly becoming a Leaf hotbed. Nissan's Paige Presley said that Atlanta was once again the Leaf's number one market and that, "sales are expanding deeper into Georgia markets such as Macon and Columbus." The Volt saw a boost upwards from a November slump and sold 2,392 units in December. That puts the plug-in hybrid's annual total at 23,094, just down from the 23,461 sold in 2012. For all of 2013, though, the Volt outsold the Leaf by 484 vehicles. In a competition like this, we'll count that as a win for both sides. We will our more detailed monthly green car sales report, which covers more of the fuel efficient vehicles on the market, up soon. News Source: GM, Nissan Green Chevrolet Nissan Electric Hybrid PHEV ev sales hybrid sales