2015 Nissan Altima 2.5 Sl on 2040-cars

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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 over 220k Altima sedans over hoods that could fly open

Nissan will be recalling 220,000 Altima sedans, according to a new recall bulletin from the National Highway Traffic Safety Administration. Apparently, model year 2013 Altimas built between March 6, 2012 and February 28, 2013 are at risk of their hoods flying open at speed.
According to NHTSA, debris, corrosion and interference between the hood's inner panel and the secondary latch lever could bind the mechanism in the unlatched position. While this in itself won't cause the hood to fly open - there's still a primary latch that needs released from within the cabin - it presents a potentially dangerous situation should the primary latch be accidentally released.
Nissan will begin notifying owners of the affected vehicles, who will need to report to their local dealer for free repairs. Scroll down for the full bulletin from the government safety watchdog.

Check out Nissan's clever digital Smart Rearview Mirror

Using cameras in place of a car's rearview mirrors has long been a feature of pie-in-the-sky concept cars, although so far, it's failed to translate into the world of production vehicles. Nissan is looking to change that, though, with its new Smart Rearview Mirror.
With a flick of a switch, drivers can jump back and forth between what they'd normally see through the rearview mirror and the camera's feed from the back of the car.
The Smart Rearview Mirror blends everything we know about traditional reflective glass mirrors with a video feed from the rear of the car into a form factor that's immediately recognizable to the average motorist. With a flick of a switch, drivers can jump back and forth between what they'd normally see through the rearview mirror and the camera's feed from the back of the car. The mirror itself features an integrated LCD display with a four-to-one aspect ratio.