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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.

Is Nissan's Le Mans LMP1 racer really going to be front engined?

Since debuting the Nissan GT-R LM Nismo under a sheet earlier this year, Nissan has kept a very tight wrap on details about the racer. The company simply promised that the model would be on the starting grid for the 2015 24 Hours of Le Mans. However, the automaker had an aggressive attitude about the new program and said that the vehicle would "win in a very different way." The brand also hinted the final result wouldn't look like its competitors. This rendering suggests just how divergent the GT-R LM might be. Posted by Jalopnik, the rendering was supposedly based on the descriptions of people who have actually seen the racer. They described a car with a very long nose, and a rear that was potentially narrower than the front. From those details the pictures of a reverse Deltawing is almost conceivable. Judging by the original teaser image, this description actually sounds somewhat plausible too. The draping of the sheet in that photo could suggest some empty space at the back. According to this rumor, underneath that long snout could be an even bigger revelation – the engine. These days putting the powerplant ahead of the driver in a top-class endurance racer – even if it's behind the front axle for a mid-engine layout – is almost unheard of. Nissan trying it would certainly fall under a different way of winning. Though, such a thing was done by Panoz in the 2000s. Nissan is clear about keeping the racecar and road version at least somewhat related, especially technologically. Jalopnik speculates that the engine could be a gasoline-fueled twin-turbocharged V6 powering the rear wheels and a hybrid spinning the front and rear with a total system output of 1,000 horsepower or more. That figure is right on the money for modern LMP1 cars since the 2014-championship winning Toyota TS040 packs about 986 hp total. In the past few years, Nissan has failed to finish Le Mans with both the Deltawing that it sponsored and the ZEOD RC project. If these rumors prove true, then even getting the GT-R LM to see the checkered flag could be quite an accomplishment no matter where it finishes. Rumor has it that Nissan might show at least a glimpse of the vehicle during the company's Super Bowl ad this year. Related Gallery 2015 Nissan GT-R LM Nismo Announcement View 16 Photos News Source: JalopnikImage Credit: Jason Torchinsky via Jalopnik Design/Style Motorsports Nissan Racing Vehicles rendering nissan gt-r lm nismo nissan gt-r lm

Nissan and Renault shelve merger plans, will repair their alliance

Renault and Nissan have shelved plans to push towards the full merger former leader Carlos Ghosn craved and will instead fix their troubled alliance to try to recover from the coronavirus pandemic, five senior sources told Reuters. Nissan has long resisted Renault's proposals for a full-blown merger as executives felt the French carmaker was not paying its fair share for the engineering work it did in Japan, sowing discord that some feared could wreck the partnership. Now, with carmakers around the world reeling from the pandemic, the partners are planning to overhaul an alliance that largely failed to convert its global scale into a competitive advantage beyond the joint procurement of parts. Both struggling carmakers are set to announce mid-term restructuring plans this week that will serve as a peace treaty designed to resolve the long-standing tensions, five people familiar with the overhaul told Reuters. "After the rain, the earth hardens," said one senior Nissan source, citing a popular Japanese proverb that means relationships become stronger after a period of strife. All five sources within the alliance, which also includes Mitsubishi, declined to be named because they are not authorized to speak with media. Nissan and Renault are each planning substantial restructuring and cost cuts that could affect tens of thousands of jobs, with the Japanese company to announce its measures on May 28 and its French partner likely to follow the next day. Before that, Mitsubishi, Nissan and Renault are holding a joint news conference on May 27 during which they are expected to outline the philosophy behind their new "leader-follower" approach to the alliance. The sources said the companies were unlikely to disclose many details at the events this week of how the new approach will be used to share costs as the companies were still working on specific projects. However, the crisis at both carmakers has accelerated efforts to resolve the disagreements that have stymied collaboration and cost-sharing in technology and product development for five years, the sources said. Mitsubishi, Nissan and Renault all declined to comment officially about alliance plans. 'Leader-follower' The alliance has steadily ramped up output over the years, delivering over 10 million vehicles for the first time in 2017, the first full year after Mitsubishi joined the partnership.