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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 Quest under investigation for inaccurate fuel gauges

After receiving 12 complaints in the last 14 months, the National Highway Traffic Safety Administration has begun a preliminary investigation into a fuel gauge issue with the 2007 Nissan Quest. Drivers have reported that the fuel level gauge will show there's gas in the tank when there actually isn't - in two cases, the digital distance-to-empty gauge indicated more than 70 miles of remaining range - and it will stall out.
This is the second time the 2007-model-year Quest has been involved in the same fuel gauge issue. In 2010 Nissan recalled seven models, including the Quest, from the 2005-2008 model years because of faulty fuel readings. The 12 vehicles in this latest complaint could have slipped through the cracks then, but we'll find out more when NHTSA updates its progress with the investigation into the estimated 37,656 units.

Nissan's Ghosn called out by Deltawing's Panoz in print ad

When the Nissan ZEOD RC limped to the side of the Circuit de la Sarthe a mere five laps into this year's 24 Hours of Le Mans, we imagine that a certain American motorsports figure at least smirked a little. Don Panoz's ongoing feud with Nissan probably means he wasn't sorry to see the arrow-shaped racecar's poor showing, and now he's stepping up his campaign against his former racing partner.
For those who need a refresher, back in 2012, Panoz and Nissan teamed up to field the DeltaWing, an innovative, wedge-shaped racer, as the first entry in the 24 Hours of Le Mans' experimental Garage 56 concept. The car rapidly became a fan favorite. The Panoz/Nissan alliance didn't last, though, and before long, the DeltaWing's designer was getting a paycheck from Nissan and the ZEOD RC racer arrived. Shortly after that, Panoz began mulling over a lawsuit alleging intellectual property infringement. The American motorsports icon would eventually pull the trigger on a suit back in December of 2013.
Panoz's latest move in the ongoing feud involves an open letter in both The Nashville Tennessean, the paper that serves Nissan's US headquarters, and trade paper Automotive News. The letter calls out Renault-Nissan CEO Carlos Ghosn directly, and points out some of the similarities between the DeltaWing and the ZEOD RC, going so far as to quote the original car's designer, Ben Bowlby.