07 55k Mi Pwr Windows Locks Auto Certified Net Direct Auto Sales Texas Clean! 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.

Next Nissan Titan will get turbocharged diesel V8 from Cummins

Toyota might be content to eke out an existence in the fullsize pickup market with its lightly refreshed Tundra, but Nissan looks like it'll be a bit more aggressive with its next-generation Titan. The next Titan will make use of a 5.0-liter, turbodiesel V8 from Cummins, the Japanese company announced at the start of its Nissan 360 industry showcase.
Nissan's commitment to a fullsize pickup isn't really open for debate - it made waves back in April when it lured Fred Diaz, CEO of Chrysler's Ram pickup division, down to its Franklin, Tennessee headquarters. But this news of a monster turbodiesel is big. As of this writing, only Ram is set to offer a diesel engine in a non-heavy-duty pickup. Its 3.0-liter, EcoDiesel V6 will arrive in the Ram 1500 in the not-so-distant future, but that engine will still be a far cry from what's promised with this Cummins mill.
The 5.0-liter V8 is expected to generate well over 500 pound-feet of torque - likely closer to 550, based on the language in the press release - along with over 300 horsepower. Those figures aren't just a shot across the bow of Ford, Chevy, GMC and Ram, they're an opening broadside, meant to demonstrate Nissan's willingness with its next light-duty truck. As Diaz said, "There is no question that the new Titan will turn heads, and with the available Cummins 5.0-liter V8 turbodiesel, we expect to win new fans and attract buyers looking for this unique configuration."

Auto industry insider previews tell-all book, What Did Jesus Drive?

"It's about some of the biggest crises in history. It's about who did it right and who did it wrong." - Jason Vines
Jason Vines, the former head of public relations at Chrysler, Ford and Nissan, has seen a lot during his more than 30-year career, and now he's offering a behind-the-scenes look at the auto industry in his tell-all book What Did Jesus Drive? that went on sale this month.