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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.

Nissan to add Rogue, Murano hybrid around 2015

Except for the limited-production, Toyota-assisted Altima Hybrid, Nissan has pretty much shied away from hybrid vehicles, but that is all about to change. As a part of a plan to launch a total of 15 electrified vehicles by 2016, Nissan is launching the Pathfinder Hybrid, which goes on sale this fall, and we've heard in the past that the Altima will get another hybrid variant, as well. Now, Green Car Reports is confirming that the Murano and the smaller Rogue (seen above in next-gen prototype phase) will both receive hybrid powertrains.
Though riding on different platforms, both hybrid crossovers could share the system being introduced in the Pathfinder, consisting of a 2.5-liter supercharged four-cylinder engine, a 22-horsepower electric motor and a lithium-ion battery pack. There is still no word on when the next-gen Murano will arrive, but the 2014 Nissan Rogue will be introduced on September 10.

Carlos Ghosn was on verge of release — so prosecutors file new allegation

TOKYO — Japanese prosecutors added a new allegation of breach of trust against Nissan's former chairman Carlos Ghosn on Friday, dashing his hopes for posting bail quickly. Ghosn and another former Nissan executive, Greg Kelly, were arrested Nov. 19 and charged with underreporting Ghosn's income by about 5 billion yen ($44 million) in 2011-2015. They also face the prospect of more charges of underreporting Ghosn's income for other years by nearly 10 billion ($80 million) in total. The breach of trust allegations were filed a day after a court rejected prosecutors' request for a longer detention of both men. The new allegation only applies to Ghosn, and Kelly could still be bailed out. A request for bail by Kelly's lawyer is pending court approval, according to the Tokyo District Court, but his release will have to wait until next week since the request was still in process after office hours Friday. Prosecutors in a statement Friday alleged that Ghosn in 2008 transferred a private investment loss worth more than 1.8 billion yen ($16 million) to Nissan by manipulating an unspecified "swap" contract. Ghosn also profited by having the company transfer a total of $14.7 million to another company to benefit himself and that company's owner, who helped in the contract manipulation, prosecutors said. Shin Kukimoto, deputy chief prosecutor at the Tokyo District Prosecutors Office, refuse to say if the two transactions were related or how Ghosn illegally profited. He also declined to identify the collaborator or whether the transactions were made overseas. Ghosn and Kelly are only charged with underreporting Ghosn's pay over five years, in violation of the Financial Instruments and Exchange Act. They have not been formally charged with an additional allegation of underreporting another 4 billion yen ($36 million) for 2016-2018, for which their first 10-day detention was to expire Thursday. Prosecutors have been criticized for separating the allegations as a tactic to detain Ghosn and Kelly longer. They say Ghosn and Kelly are flight risks. The maximum penalty for violating the financial act is up to 10 years in prison, a 10 million yen ($89,000) fine, or both. Breach of trust also carries a similar maximum penalty. The conviction rate in Japan is more than 99 percent for any crime. Ghosn was sent by Renault in 1999 to turn around Nissan, then on the verge of bankruptcy, and he led its rise to become the world's second-largest automaker.