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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 #380

Episode #380 of the Autoblog podcast is here, and this week, Dan Roth, Chris Paukert and Seyth Miersma talk about the Fiat-Chrysler five-year plan, the seeming demise of the Nissan Cube, and proposed legislation to require speed limiters with a 68-mph maximum on America's tractor trailers. 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 #380: Topics: Fiat-Chrysler five-year plan Nissan Cube on the way out? Big rig speed limiters coming? In the Autoblog Garage: 2015 Mercedes-Benz S63 AMG 2014 Chevrolet Sonic RS Sedan 2014 Honda Odyssey Touring Elite Hosts: Dan Roth, Chris Paukert, Seyth Miersma Runtime: 01:44:17 Rundown: Intro and Garage - 00:00 Fiat Chrysler Plan - 29:40 Nissan Cube - 01:07:33 Semi Speed Limiters - 01:17:33 Q&A - 01:27:35 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 Auto News Earnings/Financials Plants/Manufacturing Podcasts Rumormill Chevrolet Chrysler Dodge Fiat Jeep Nissan nissan cube speed limiters

Carlos Ghosn: What misconduct is he accused of?

TOKYO — Japan was shocked by news that Nissan Motor Co. Chairman Carlos Ghosn, who was widely respected for rescuing the carmaker from near bankruptcy, was arrested on Monday for alleged financial misconduct. Nissan said that Ghosn, who is also chairman and CEO of Renault and chairman of Mitsubishi Motors, would be fired from his post as Nissan chairman on Thursday. What is Carlos Ghosn accused of? Nissan CEO Hiroto Saikawa told a packed press conference on Monday night that the company had found that Ghosn had been using corporate money for personal purposes and under-reporting his income for years in official company filings to the Tokyo Stock Exchange. Another board member, Greg Kelly, was also deeply involved in the misconduct, Nissan said. Saikawa said he couldn't elaborate as the cases are being investigated by prosecutors, who have declined to comment. Prosecutors said that Ghosn and Kelly conspired to understate Ghosn's compensation over five years starting in fiscal 2010 as being about half of the actual 9.998 billion yen ($88.9 million). Public broadcaster NHK said Nissan paid billions of yen to buy and renovate homes for Ghosn in Rio, Beirut, Paris and Amsterdam, citing unnamed sources. The properties had no business purpose and were not listed as benefits in TSE filings, NHK said. Ghosn, 64, has not been formally charged. The Asahi newspaper reported that he and Kelly had submitted to prosecutors' questions after getting off a plane on Monday afternoon at Tokyo's Haneda Airport. Saikawa confirmed they had been arrested. Ghosn and Kelly have not been seen since, and their exact whereabouts are not known. Suspects are typically taken to the Tokyo Detention Center, which is linked to the Tokyo District Public Prosecutors Office. How did this come to light? Nissan's Saikawa said Ghosn's alleged improprieties came to light through a whistleblower, after which the company began an internal investigation and informed prosecutors. Japanese media reports say the informant is a member of Nissan's legal department. The Asahi reported, without citing sources, that the informant gave the prosecutors information in a plea bargain, implying the person may have provided evidence in exchange for a lighter sentence. How much control did Carlos Ghosn have? After becoming CEO of struggling Nissan in 2001, Ghosn was hailed as the automaker's savior by implementing an aggressive cost-cutting plan.