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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.

2022 Infiniti QX60 spied running around post-Monograph Concept reveal

Infiniti recently revealed the QX60 Monograph Concept, a concept crossover meant to preview the next generation QX60. Today, the first spy shots of the QX60 in production form hit our desks. There’s a whole lot we canÂ’t see under the camouflage, but it looks fairly representative of what we expect a production version of the Monograph Concept would look like. The headlights, grille design, lower opening and side air intakes all look like they were pulled straight off the concept. It also has the same hood design with raised outer edges that lead right into the A-pillar. Its droopy side camouflage does a good job of disguising its curvaceous profile and pronounced rear fenders. We can see a hint of widening at the rear fenders, and we hope that the MonographÂ’s look is translated over to production there. The mirrors were moved further down onto the doors, and the flush door handles are done away with. This tester appears much less flamboyant with normal-size wheels replacing the giant and dramatic spinners on the Concept (gallery of the concept below). Infiniti QX60 Monograph View 36 Photos Infiniti is copying the shape of the rear over to production. We can clearly make out the raked rear window, overhanging spoiler and rounded shape of the back end. The taillights are a bit difficult to see, but their general design matches up to the Concept. As for the fancy chromed exhaust area on the concept, those spots appear flat and barren on this preproduction model. ItÂ’s still heavily covered in camo, though, so we donÂ’t yet know what the rear bumper design will look like in its final form. The production QX60 is set to be revealed next year where it will likely go on sale as a 2022 model year car. ItÂ’s unclear what powertrain(s) will be lurking under the hood, but at least we know the production version wonÂ’t stray terribly far from the concept now. Related Video:

These are the top luxury cars bought by people entering the segment for the first time

Let's say you just got a big promotion at work or the kids are moving out of the house, and you finally have some extra money. You decide to blow it all at once and treat yourself by upgrading your ride. Naturally, you look to a luxury automaker. What do you choose?
Models like the Audi A3 and Mercedes-Benz CLA-Class may be tailor-made to introduce buyers to the premium segment, but a new study finds that they don't garner the highest rates of non-luxury customer conquests. It turns out that a Volvo leads among folks moving up to a premium brand, and it isn't even one that's made anymore, at that.
A recent study by Polk and IHS Automotive looked at what models had the highest rates of buyers upgrading from a non-luxury segment. The information comes from its new vehicle registration data through April 2014. All ten top models boasted conquest rates of over 50 percent, but the Volvo C70 led the field with 68.01 percent of its customers coming from non-premium brands.