2001 Nissan Pathfinder Le Sport Utility 4-door 3.5l 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.

2013 Nissan Leaf [w/video]

If It Ain't Broke, Don't Fix It
Look at the 2013 Nissan Leaf - even one parked next to a 2012 model - and you'll be hard-pressed to spot the differences. Changes and updates have been made, but you have to know the details to tell. It's sort of like listening to a hipster tell you why Interpol and The National have completely different sounds.
Nissan says it didn't reinvent the Leaf because what the company has created is working. Over 25,000 Leafs have been sold in the US - 62,000 around the world - since the car went on sale in late 2010. That may not sound like a lot, but it's heads and shoulders above any other all-electric car available anywhere. The car has its detractors - boy, does it ever - but Nissan knows it's hard to argue with real-world success.

Bret Michaels Poisons Nissan's commercial trucking ops

Mötley Crüe isn't the only 1980s hair-metal band getting into the world of auto promotion. Poison frontman and reality show star Bret Michaels is following their lead and doing some advertising of his own. Where the Crüe have been all over the airwaves in recent years with a Super Bowl ad for Kia and music licensing with Dodge, Michaels has taken a very different route by becoming the pitchman for Nissan Commercial Vehicles.
The videos run the gamut to advertise predominantly the NV line of full-size vans, but the NV200 shows up a few times too. The star of this new campaign is Michaels' full-length music video (above) for the song Tough Love. It's basically a parody of all of those '80s rock ballads where the bands would slow the tempo down a little and reveal their softer side. Michaels rocks out at the Nissan proving grounds in Stanfield, AZ, while showing off the evaluation process and strutting around like a proper rock frontman. There are also a bunch of shorter videos (below) with the singer highlighting each part of the vans' torture testing. Although, the dialogue in these come off a bit more stilted. With these '80s metal bands getting into advertising, can it be long before Warrant is shilling for Fiat or Ratt for Mazda?