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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.

New allegations against Ghosn concern payments to Saudi businessman

BEIJING – Fresh misconduct allegations brought by Tokyo prosecutors against ousted Nissan Chairman Carlos Ghosn center on the use of company funds to pay a Saudi businessman who is believed to have helped him out of financial difficulties, two company sources with knowledge of the matter said. Prosecutors arrested Ghosn for a third time on Friday, accusing him of aggravated breach of trust in transferring personal investment losses to the automaker. The prosecutors' statement said they believe that around October 2008, Ghosn was trying to deal with losses on paper of 1.85 billion yen ($16.6 million) incurred on a swap contract he had with a bank which it did not name. A person helped arrange a letter of credit for Ghosn and a company run by the person later received $14.7 million in Nissan funds in four installments between 2009 and 2012, the statement said, adding that the payments were made in Ghosn's and the person's interests. "By doing so, (Ghosn) behaved in a way that breached trust, and inflicted damage on the property of Nissan," the statement said. The statement also said Ghosn had earlier sought to have Nissan shoulder the appraisal losses directly. According to the Nissan sources who have knowledge of the company's probe into its former chief, the person who helped Ghosn is Khaled Al-Juffali, vice chairman of one of Saudi Arabia's largest conglomerates, E. A. Juffali and Brothers, and a member of the board at the Saudi Arabian Monetary Authority. He is also majority owner of a company called Al-Dahana which owns half of a regional joint venture called Nissan Gulf with the other half held by a wholly owned unit of Nissan Motor. Sheikh Khaled Juffali has no comment on this subject, according to an emailed statement from E. A. Juffali and Brothers. Ghosn's Tokyo-based lawyer, Motonari Otsuru, was unavailable for comment on this article, according to a person who answered the phone at his law office. A representative for the Ghosn family declined to comment. Other media have said Ghosn has through a lawyer denied that he shifted losses to Nissan and has told investigators that the four payments were for legitimate business purposes, including a reward for handling problems at Nissan dealers in Saudi Arabia. Tokyo prosecutors declined to comment. Asked about Ghosn's reported comments, a Nissan spokesman said: "We cannot comment on matters related to Ghosn's arrest for breach of trust.

Syrena Sport returns as rebodied Nissan 370Z

We wouldn't hold it against you if you'd never heard of the FSO Syrena Sport. FSO built the long-enduring Syrena for some 17 years nonstop, and while the machines were mostly plodding family sedans, engineers at FSO did create one version with a bit more zest. The Syrena Sport was a two-door coupe that borrowed design cues from Ferrari and was powered by a two-cylinder, air-cooled boxer engine. While originally intended for production, economic woes kept the machine from ever seeing the light of day.
Now, the Syrena Sport is back, though in a slightly different configuration. Entrepreneur Rafal Czubaj has resurrected the name for a special one-off creation designed by Pavlo Burkatskyy. This time around, there is no oddball boxer under the hood, however. Czubaj chose to use the underpinnings from the Nissan 370Z, complete with its 3.7-liter V6 engine. Buyers can choose between a 330-horsepower tune or a 450-hp iteration, and with a curb weight of 2,865 pounds, the car should be plenty quick. Expect acceleration to 60 miles per hour in around 4.5 seconds and a top speed of 180 mph.