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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.

Infiniti QX55 Luggage Test | The price to be paid for a coupe

The Infiniti QX55 is the crossover-coupe version of the QX50, which like other such variants available throughout the industry, chops the roofline and cargo area down to create a "coupe-like" appearance. Obviously, this results in a reduction in cargo capacity, but because that reduction is largely above the back seat line, the actual reduction in usable cargo space isn't as great as you might expect. While carrying a large box or some other tall, bulky thing will be more difficult, smaller items like suitcases won't necessarily be much different since carrying them above the back seat line can reduce or eliminate rear visibility and create a hazard by flying forward while stopping as well. It's for those very reasons I don't stack to the roof in luggage tests. Now, I have not tested the QX50, so I have no point of comparison in that regard. But I have tested a variety of crossover-coupes and the QX55 does indeed share common attributes ... and detriments.  On paper, the Infiniti QX55 has 26.9 cubic-feet of cargo space behind its back seat. That is basically the same as the Audi e-Tron Sportback and a bit less than the Mustang Mach-E and Toyota Venza. The Cayenne Coupe figure just seems inaccurate.  The QX55's back seat reclines, however, so its amount is variable. I do not know where Infiniti set it while doing it's measurement, but I set it for a comfortable degree comparable to most fixed back seats. You can also easily lower the back seat with handles in the cargo area. Both elements are pictured below.  Now, let's get to the bags. As in every luggage test I do, I use two midsize roller suitcases that would need to be checked in at the airport (26 inches long, 16 wide, 11 deep), two roll-aboard suitcases that just barely fit in the overhead (24L x 15W x 10D), and one smaller roll-aboard that fits easily (23L x 15W x 10D). I also include my wife's fancy overnight bag just to spruce things up a bit (21L x 12W x 12D). Cool, that was easy. All the bags easily fit with minimal Tetrising and ... Oh no. Wait, they don't. Despite all the bags seeming to be clear of the liftgate, the power-closing function got stuck repeatedly. I could slam it shut manually, but that's another no-no here at Luggage Test Portland in order to keep things consistent.  I then Tetrised and Tetrised and Tetrised again. No good, no good, no good. "Boy, what an annoying cargo area," I said to an empty street. This is what eventually worked after the sixth attempt.

Infiniti Prototype 10 concept to debut at Pebble Beach

Last year, Infiniti launched its gorgeous Prototype 9 concept at the Pebble Beach Concours d'Elegance. It was an open-wheel, retro-styled car inspired by Grand Prix racers of old. Just as important as its design, though, was its powertrain. It was all-electric. This year, at Pebble Beach, Infiniti will return with a new speedster concept called Prototype 10. It, too, will be electrified. Teased in the above image, the open-cockpit Prototype 10 will be another single-seater steeped in classic design, though with looks the automaker describes as "cool, clean and forward-looking," borrowing some cues from the Infiniti Q Inspiration concept we saw at the Detroit Auto Show earlier this year. Karim Habib, Infiniti's executive design director, describes Prototype 10: The Infiniti Prototype 10 echoes the layout and design of some of the most evocative car designs of all time, where power was celebrated through high-powered single-seat competition cars. Our new concept speaks of an electrified future, something which is reflected in its form and details. It is appropriate that we found inspiration in an optimistic bygone era in which cars were characterized by the simple love of driving. Still, Infiniti leaves out most of the details about the car. We're curious what kind of "electrified" powertrain Prototype 10 will use, but the company plans to electrify its whole lineup beginning in 2021. It's possible Infiniti could tease further images and information, but we'll likely have to wait for its official unveiling at Pebble Beach on Aug. 23, which is right around the corner. If the last two concepts are any indication, this one should be a stunner as well. Related Video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. News Source: Infiniti Green Infiniti Convertible Concept Cars Electric Hybrid Performance Pebble Beach