2014 Nissan Rogue Sv 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 will expand free* charging incentive to 25 Leaf markets

Nissan has proof that giving away a bit of electricity makes buying a new Leaf all the more enticing. Thanks to a deal that offers free charging to some Leaf owners in Texas, one dealer there claims his Leaf sales have tripled. We don't see national sales climbing quite that high starting July 1 2014, but an announcement made today at the New York Auto Show will likely give the EV a boost. New Leaf buyers will get to charge for free at public chargers for two years. Within limits: a max of 30 minutes at CHAdeMO and an hour at Level 2 stations. Nissan will expand its "No Charge to Charge" promotion to at least 25 markets across the US. The deal means that new Leaf buyers will get to charge for free at public chargers that accept the new EZ-Charge card, within limits. That means a maximum of 30 minutes at CHAdeMO DC fast chargers and just one hour at Level 2 stations, Brendan Jones, director of Nissan EV infrastructure strategy and development, told AutoblogGreen. This should be plenty of time, Jones said, since the average Leaf driver comes to a CHAdeMO station with 35-40 percent state-of-charge on the battery and the average time they stay is around 16-17 minutes. A half hour is fine at a fast charger, since the battery will get to 80 percent full within that time, but we're less impressed with the one-hour limit at a Level 2 station, since that will only put maybe 20 miles into the battery. The EZ-Charge card is compatible with four of "the leading EV charging networks," which here means ChargePoint, Blink, AeroVironment and NRG eVgo. Nissan says the 25 markets make up over 80 percent of all the US Leaf sales. Anyone who buys a new Leaf in one of the specified markets - or bought one on or after April 1 of this year - will get the free-to-use EZ-Charge card (others can still get the card, which means only carrying one charger company fob instead of four). The promotion starts July 1 in 10 markets (San Francisco, Sacramento, San Diego, Seattle, Portland, Nashville, Phoenix, Dallas-Fort Worth, Houston and Washington, DC) and then expands to the next 15 by the end of June, 2015. Nissan would not specify which markets these will be, but they will be where the Leaf is selling well and there are DC fast chargers. That means, we suspect, places like Chicago, St. Louis, Philadelphia and Atlanta.

This tiny 1.5L engine from Nissan makes 400 horsepower

Back in 2012, Ford packed its tiny 1.0-liter EcoBoost three-cylinder in a carry-on suitcase, destined for use in the Fiesta here in the US. In June, Nissan will pack its tiny new three-cylinder engine in a 24 Hours of Le Mans racecar. Nissan's don't-call-me-DeltaWing ZEOD RC racecar will still be able to tackle a single lap under full electric power, but the rest of the time it will be powered by the new 1.5-liter turbocharged three-cylinder engine.
Holding the lightweight engine (at right) is Nismo president Shoichi Miyatani, and he's likely smiling because that 40-kilogram (88-pound) engine packs quite a punch with 400 horsepower and 280 pound-feet of torque. Nissan would like to take a moment to point out this engine's power-to-weight is better than the engines currently used in Formula One racecars. Scroll down for more information on this new race engine, which we'll see in action at Le Mans in June.