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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.

Panoz mulls suing Nissan for ZEOD RC's Deltawing likeness

Imitation might be the sincerest form of flattery, but in racing, where something as simple as a car's shape can lead to a competitive advantage, imitation can be a big no-no. That reality is being played out right now, with the DeltaWing prototype and the Nissan ZEOD RC. The two cars, as you can see from the images above, bear a striking resemblance to each other. They're so similar, in fact, that Dr. Don Panoz, one of the big names behind the DeltaWing program, is assigning some legal eagles to investigate any patent infringement.
The similarity shouldn't be a shock, though. Both cars are penned by Ben Bowlby, and the DeltaWing - which will be arriving as a coupe in the very near future - had Nissan branding and power for a not-insignificant amount of time. But for Panoz, the ZEOD RC's resemblance is just a bit too much, as he told Autoweek, "It's been interesting to watch people from Nissan trying to dodge the question, but the fact is that in their own press release they admit that the configuration of the ZEOD is the same as the DeltaWing. And we do have patents, in fact another one was just issued last week. We are in discussions with our legal advisors and we'll see what happens."
Frankly, it's not difficult to see what Panoz means. The general shape of the ZEOD RC, with its wide rear track and narrow front track arrangement - not to mention the headlights mounted over the rear wheel arches and any arrangements not visible under the body - are so reminiscent of the DeltaWing that differences like the shape of its closed cockpit and more upright front end might not prove different enough to avert Panoz's legal action. We'll stay with this one and let you know as more becomes available.

Nissan Titan Pro-4X, Hyundai Kona and Mitsubishi Outlander PHEV | Autoblog Podcast #621

In this week's Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Consumer Editor Jeremy Korzeniewski and Senior Editor, Green, John Beltz Snyder. They talk about cars they've driven recently, including the 2020 Nissan Titan Pro-4X, Hyundai Kona and Mitsubishi Outlander PHEV. Then they talk news, starting with Volvo's new pick-up and drop-off service. Then they talk about Q1 U.S. sales figures. Lastly, they discuss the possibility of new styles of motorcycle from Harley-Davidson, including a flat-track bike and a cafe racer. Autoblog Podcast #621 Get The Podcast iTunes – Subscribe to the Autoblog Podcast in iTunes RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Rundown Cars we're driving 2020 Nissan Titian Pro-4X 2020 Hyundai Kona Ultimate AWD 2020 Mitsubishi Outlander PHEV Volvo Valet U.S. car sales plummet Harley-Davidson cafe racer and flat track motorcycles Feedback Email – Podcast@Autoblog.com Review the show on iTunes Related Video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.