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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.

Autoblog Podcast #391

Episode #391 of the Autoblog Podcast is here, and this week, Dan Roth, Mike Harley and Brandon Turkus talk about the appointment of Kumar Galhotra to run Lincoln, changes coming for Scion, the Dodge Charger SRT Hellcat, and which cars won't live into 2015. We also take a quick detour to talk about the Infiniti Q50 Eau Rouge prototype, which Mike Harley just came back from driving. We start with what's in the garage and finish up with some of your questions, and for those of you who hung with us live on our UStream channel, thanks for taking the time. Check out the new rundown below with times for topics, and you can follow along down below with our Q&A. Thanks for listening! Autoblog Podcast #391: Topics: 2015 Infiniti Q50 Eau Rouge Prototype New boss at Lincoln Scion xB, iQ ending soon Dodge Charger SRT Hellcat Cars that won't live to 2015 In the Autoblog Garage: McLaren 650S Hyundai Genesis Hosts: Dan Roth, Michael Harley, Brandon Turkus Runtime: 01:42:06 Rundown: Intro and Garage - 00:00 Infiniti Q50 Eau Rouge - 30:05 Kumar Galhotra to Lincoln - 34:32 Scion Changes - 43:58 Dodge Charger Hellcat - 54:25 Discontinued Cars - 01:06:24 Q&A - 01:22:59 Get the podcast: [UStream] Listen live on Mondays at 10 PM Eastern at UStream [iTunes] Subscribe to the Autoblog Podcast in iTunes [RSS] Add the Autoblog Podcast feed to your RSS aggregator [MP3] Download the MP3 directly Feedback: Email: Podcast at Autoblog dot com Review the show in iTunes Hirings/Firings/Layoffs Podcasts Dodge Hyundai Infiniti Lincoln McLaren Scion Supercars mclaren 650s

Cadillac snags de Nysschen from Infiniti, names him new president

Johan de Nysschen, the (now former) president of Infiniti, has officially jumped ship. The 54-year-old, who also spent time as the chief executive for Audi USA, has taken the position of president at Cadillac, following a two-year stint at the Nissan-owned luxury brand. In his new role, the 54-year-old will be responsible "for all aspects of Cadillac globally," according to a statement from General Motors.
"Johan brings to our company vast experience in the development and proper execution of luxury automotive brands," said GM President Dan Ammann, de Nysschen's new boss. "With over 20 years in this exact space, especially in the development of the Audi brand, his track record proves he is the perfect executive to lead Cadillac for the long term."
"I have for some time now been impressed by how the new General Motors has been transformed into a formidable force in the industry," de Nysschen said in a statement. "The combination of strong corporate leadership and exceptional engineering resources presents the perfect combination to restore Cadillac to its place among global premium brands."