2015 Nissan Altima 2.5 S 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.

First new Datsun in decade sketched, set for Indian reveal

Nissan's Datsun nameplate revival will begin with two models bound for the Indian market. Nissan has released sketches of a five-door hatchback based on the Micra (codenamed K2) and a top-down view of a hood that could potentially be from a sedan.
The company's press release says all will be revealed on July 15 in New Delhi, India. The Datsun lineup will be first offered in 2014 to that country's ride-deprived residents as well as Indonesia and Russia. Later in 2014, South Africa will join the list.
We've heard Nissan plans for Datsuns to share platforms with company-owned Lada. In January, we heard the projected price tag could be around $3,000 USD to compete with Chinese imports. The official press release (which can be read in full below) says nothing about either of these reports, however.

Nissan has now sold 75,000 Leaf EVs in the US

Somehow it doesn't surprise us that the 75,000th Nissan Leaf electric vehicle sold in the US would go to a guy from Portland, Oregon. Rishabh Mehandru, who first experienced the Leaf through a lease a couple of years ago, took the full plunge with a 2015 model and ended up being No. 75,000 (ding, ding, ding!). You've got to love those repeat customers. The Intel engineer has a 30-mile commute, so, theoretically, the Leaf does the trip with about two-dozen miles to spare in its single-charge range. The Portland dealership that sold him the car says its Leaf customers are an "even" mix between new and repeat. Nationwide, Nissan boosted its Leaf sales last year by 34 percent to 30,200. Things have cooled off a bit so far this year, as Leaf sales through February were down 15 percent from the same period in 2014 to 2,268 units. As of the end of last month, Nissan Leaf's US sales since its late-2010 introduction trailed sales of the Chevrolet Volt extended-range plug-in by exactly two units. Which means we can expect General Motors' announcement that the Volt has hit 75,000 units any day now. Take a look at Nissan's press release below. Related Videos: Nissan delivers 75,000th all-electric LEAF in the U.S. to Oregon family NASHVILLE, Tenn. – Nissan celebrated with Rishabh Mehandru of Portland, Oregon, as he purchased the 75,000th Nissan LEAF in the United States. This is Mehandru's second Nissan LEAF after leasing his first one two years ago in an effort to reduce the emissions he was putting into the air. "I'm a runner, and when I ran outside I found that I was inhaling a lot of exhaust from the gas-powered cars that passed me on the roads," said Mehandru. "I instantly became aware of the amount of fuel I was burning, and that's when I first decided that I wanted to get an electric car." Mehandru, senior engineer at Intel, has a commute of about 30 miles and enjoys the spirited driving experience Nissan LEAF has to offer. "When the lease was up on my first Nissan LEAF, I knew that I didn't want any other car. I had to have another Nissan LEAF," said Mehandru. "I love how quickly I can get up to speed on the highway-even my three-year-old son notices how zippy it is-and I like that I don't have to stop for gas." Mehandru's excitement for his electric car is contagious, and he recently convinced a friend to also purchase a Nissan LEAF.