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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.

Assessing Sebastian Vettel's first 100 days as Infiniti's director of performance

Whenever a new US president is elected, we know to expect a performance review as soon as he (or she) has spent 100 days in office. Sebastian Vettel, arguably given a job that is more important to Infiniti than the US president, has been the brand's director of performance for one hundred revolutions of The Blue Marble, and Infiniti has put together a videographic glimpse of his work at Paul Ricard, in the US and England.
We probably won't really get a grip on the full results of his efforts for a while - we doubt that he's been in his post long enough to significantly alter the trajectory of the Q50 sedan, for instance. But then again, Infiniti insists he's been integral to the car's dynamics development regime, suggesting he's been working as a test driver for some time before these 100 days. Of course, Vettel is a race car driver and brand ambassador first and foremost, but when he tells a Q50 engineer that "For the future, I think it's more comfortable to have the shift paddles on the steering wheel," we get the sense that he won't hesitate to suggest changes in forthcoming products. Check out more of his inputs in the video below as well as a press release detailing his visit to the tech center in Cranfield, UK.

Lexus LX 600 first impressions, a $485k Rolls and old Dodge Vipers | Autoblog Podcast #718

In this episode of the Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Associate Editor Byron Hurd for a packed hour of Rolls-Royce, Infiniti, Lexus and early Dodge Viper content. The two start by talking about what they've been driving, kicking off with the 2022 Toyota Land Cruiser Lexus LX 600, followed by stores from Greg's road trip in an Infiniti QX55. From there, it's on to the $485,000 Rolls-Royce Ghost Black Badge that Byron was loaned for a weekend lake cottage getaway. After that, they celebrate Autoblog Podcast #718 with some Porsche Cayman and Boxster anecdotes, followed by Byron's used vehicle spotlight on the early Dodge Viper.  Autoblog Podcast #718 Get The Podcast Apple Podcasts – Subscribe to the Autoblog Podcast in iTunes Spotify – Subscribe to the Autoblog Podcast on Spotify RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Rundown Cars we're driving 2022 Lexus LX 600 2022 Infiniti QX55 2022 Rolls-Royce Ghost Black Badge Used Vehicle Spotlight1992-2002 Dodge Viper Feedback Email – Podcast@Autoblog.com Review the show on Apple Podcasts Autoblog is now live on your smart speakers and voice assistants with the audio Autoblog Daily Digest. Say “Hey Google, play the news from Autoblog” or "Alexa, open Autoblog" to get your favorite car website in audio form every day. A narrator will take you through the biggest stories or break down one of our comprehensive test drives. Related video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. 2022 Porsche 718 Cayman GT4 RS at the 2021 LA Auto Show