Sv Clean One Owner Special Chrome Package Power Back Window Tow 4 Door Crew 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.

Weekly Recap: New bosses try to jump-start Cadillac and Lincoln

Both of America's domestic luxury brands seem to be stuck in neutral.
It's ironic that Cadillac and Lincoln got new bosses within days of each other this month. It's also a commentary on the fact both of America's domestic luxury brands seem to be stuck in neutral.

Bug-eyed next-gen Nissan Titan spied testing

It's no secret that the fullsize pickup truck market is dominated by offerings from Detroit's Big Three automakers, the Nissan Titan and Toyota Tundra not able to outdo the Ford F-150, Ram 1500 or Chevy Silverado/GMC Sierra twins. A great deal of that has to do with the fact that, while the American trucks have all undergone evolutionary updates that include a range of body styles, fuel-efficient engines and excellent technology, the Japanese offerings are, well, really old. Toyota is offering an updated Tundra for the 2014 model year, and while we haven't driven it yet, we're already betting that it's still behind the pack in terms of competitiveness - the 2013 model placed fifth out of sixth in a recent PickupTrucks.com comparison test.
At the bottom of the pack lies the Nissan Titan, a truck that hasn't received any sort of substantial update since its introduction nearly ten years ago. But that's going to change - a new truck is slated to debut for the 2015 model year, and these spy shots of a Titan mule clearly show that things are moving forward.
While this tester relies heavily on the current truck's bodywork for testing purposes, the new Titan will have a revised design, some of which is evidenced by the bug-eyed front fascia of this mule. No, the production model isn't going to look all weird (we hope), but the higher, more outboard headlight placement suggests that the new truck will be a bit wider than the current model.