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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 Titan Wounded Warrior project lands in time for Veteran's Day

We last featured the crowdsourced Project Titan pickup back in September, back when Nissan revealed that its big, bruising custom pickup would take to the wilds of Alaska with a pair of veterans from the Wounded Warrior Project at the wheel.
Now, their journey across the wilds has been fully revealed as part of a 22-minute short film. David Guzman and Kevin McMahon are the pilots of the brutish truck, and while the film is ostensibly focused on the journey and the challenges that come with it, the release of the video on Veterans Day (Remembrance Day or Armistice Day, depending on where you're from), gives some indication to the dominant theme of the story - recovery.
The two travel across Alaska in the Titan on different missions, working with both veterans and civilians afflicted with post-traumatic stress disorder, as well as supporters of the Wounded Warrior Project. From the avalanche-surviving photographer who's suffering from PTSD to an Air Force veteran who routinely takes recovering vets on fishing trips, the pair experience the many efforts at recovery and support throughout the course of the missions and their journey.

Nissan to expand next-gen Titan with more engines, configurations

Not much has changed with the Nissan Titan in the decade that it's been on the market, but the 2015 model year could move the needle enough to turn the truck from an "also ran" in the fullsize truck market to more of a contender. Edmunds had the chance to sit down with Pierre Loing, vice president of product and advanced planning and strategy for Nissan North America, who indicated that not only will a new truck be coming for 2015, it is also expected to take a bigger chunk of the truck market currently dominated by Ford and General Motors.
For starters, the article quotes Loing saying that the next-gen Titan could sell 100,000 units, which is almost five times the number of Titans and the same number of Toyota Tundra trucks sold last year. To accomplish this, Nissan is planning to offer a wider number of models (including a regular cab version) and more powertrain options; we're sure this means Nissan is considering offering a V6. The addition of a regular-cab, V6 Titan would also allow this truck to be more competitively priced.
Will that be enough to attract buyers away from the Big Three domestic trucks? We'll just have to wait and see...