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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's QX50 Concept debuts in oh-so-close-to-production form in Detroit

Infiniti debuted the new QX50 concept today at the Detroit Auto Show, a preview of the midsize crossover set to hit the market soon and an evolution of the 2016 QX Sport Inspiration. This previews the followup to the current QX50, which debuted way back in 2007 as the Infiniti EX. The QX draws on Infiniti's current design language and looks like a slightly shortened version of the larger QX60. While this is still a concept, don't expect the full production version to stray too far from what we see here. Infiniti's press release is full of phrases like "driver-centric, passenger-minded" design, but in reality it's just a handsome but mostly traditional shape. The big news is that the QX50 will be the first application of Infiniti's trick variable-compression 2.0-liter turbocharged inline four. The engine's design promises both high horsepower and high fuel economy. Infiniti is claiming 268 horsepower and 27-percent better fuel economy when compared to the outgoing model. View 17 Photos Also coming on the new QX50 are a suite of active safety and autonomous features. While the details on both are extremely vague, Infiniti claims that the autonomous tech will allow the driver to retain ultimate control over the vehicle. That seems a bit counter to how autonomous driving works, so it will be interesting to see how the system actually functions. The active safety systems are said to be proactive, with future versions using lasers, radar, and cameras. While the outgoing QX50 was a rear-wheel-drive swoopy crossover, this new model appears to send power to the front wheels. Infiniti's release doesn't expressly say, but it does hint towards it with notes about a shorter hood and a "front-biased intelligent all-wheel drive system." This makes sense, and we don't see many enthusiasts lamenting the loss of a dated, rear-drive crossover. No word on pricing or when we'll actually see a production version. The current model turns 10 this year, albeit with a mid-cycle refresh. Look for news of a final production version very soon. Related Video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. Related Gallery Infiniti QX50 Concept View 24 Photos Image Credit: Live photos copyright 2017 Drew Phillips / Autoblog Design/Style Detroit Auto Show Infiniti Technology Emerging Technologies Crossover SUV Concept Cars Videos Original Video 2017 Detroit Auto Show infiniti qx50 variable compression ratio

NHTSA Probes Nearly 400,000 Infiniti, Honda Vehicles Over Steering Faults

As many as 391,000 vehicles from Honda and Infiniti may eventually need to be recalled as a result of two, separately announced Preliminary Evaluations from the National Highway Traffic Safety Administration to ascertain the scope of the potential safety hazards. In one of the queries, NHTSA is looking into 24 reports from drivers of the 2013 Honda Accord who say they had total loss of their power steering or experienced a sudden increase in the necessary effort to turn the wheel. In four cases, the problem may be linked to crashes. According to the claims, 13 people reported seeing a warning message during the failure. Turning off the car and restarting it would fix the issue in some cases. If a recall is necessary, it could affect an estimated 374,000 Accords. The second investigation is much smaller in scope. The safety agency is investigating the 2008 Infiniti EX35 after two complaints of the steering wheel shaft separating and the vehicle losing the ability to steer. Both reports say the steering became loose when driving and then completely failed once the vehicle was stopped. A recall for the problem would affect an estimated 17,000 vehicles. Recalls Honda Infiniti Safety NHTSA steering