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A look inside Infiniti's variable-compression engine

We're sympathetic to anyone who had trouble understanding what's going on with Infiniti's new variable-compression engine. While we got a full tech briefing on the novel VC-Turbo back in August, the visual aids were lacking. The cutaway engine Infiniti brought to the Paris show fixes all of that. You can thank the little green and pink lines on the cutaway for making the whole idea a little more clear. Click through the gallery to see two lines – one green and one pink – that represent the different strokes allowing for different compression ratios. Remember, the compression ratio is the amount of volume in the cylinder on intake compared to the amount at the end of the compression stroke. Leave more room at the end and you lower that ratio. The length of the stroke doesn't change with this system, but where it sits along the cylinder does. Hence those two lines. The variable compression ratio allows this new turbocharged engine to maximize fuel economy when the turbo isn't needed by raising the compression ratio. It will see its first use in the next Infiniti QX50 crossover, previewed by the QX Sport Inspiration concept that's also on display in Paris, and has performance targets of 268 horsepower and 288 pound-feet of torque. After, it will migrate to other Infiniti and Nissan vehicles, with transverse front-drive-based applications first in line. Eventually, it's likely to completely replace Nissan's corporate 3.5-liter V6. We'll be poking around the engine a little more in Paris today to try and get some more info. For now, enjoy those cutaway images and those friendly little lines. Featured Gallery Infiniti VC-Turbo engine cutaway View 14 Photos Paris Motor Show Infiniti Nissan Technology Emerging Technologies engine 2016 paris motor show

Weekly Recap: Ferrari, Ford and Porsche power up for Geneva

Monday was Groundhog Day. Tuesday, apparently, was Sports Car Day. The Ferrari 488 GTB, the Ford Focus RS and the Porsche Cayman GT4 all debuted within hours of each other ahead of their rollouts at the Geneva Motor Show. Three sporty machines, three vastly different approaches – and a lot of implications for enthusiasts. That's a day worth repeating. It also illustrates the opportunities automakers see in the performance market, which is expected to grow in the coming years. Ford estimates the segment has expanded 14 percent in Europe and surged 70 percent in North America since 2009. The Detroit Auto Show was evidence of this, and performance cars of every stripe debuted, including the Acura NSX, Ford GT, Alfa Romeo 4C Spider and several others. This isn't a fad. Performance cars aren't going away. The question is why? Stricter CAFE standards are looming in the United States, as are tighter emissions regulations in Europe. And no one expects gas prices to remain low in America. None of this matters for sports cars, and automakers are increasingly using them to elevate their images. That's why Dodge rolled out two 707-horsepower Hellcats last year. It's why Ford has decided to resurrect the GT for road and track. It's why in the depths of bankruptcy, General Motors continued work on the Chevrolet Corvette Stingray, not to mention the Z06. "Great brands are made one car at a time," Ford of Europe president Jim Farley said at the reveal of the Focus RS. Still, companies make those cars for different reasons. View 5 Photos Mainstream brands like Ford and Dodge want to build cars that get people talking, excite their bases and drive more potential customers into the showroom. They probably don't buy a Focus RS or a Hellcat, but suddenly the regular Focus hatch looks a bit hotter, and that V6 Charger seems to be just a touch more muscular. The halo of performance is alive and well in the eyes of automakers and their customers. "It's one of the most effective catalysts for ingenuity and innovation," said Joe Bakaj, vice president of product development for Ford of Europe. That also leads to a trickle-down effect. Some of the technologies inevitably make their way to other products. It's hard to think the new all-wheel-drive system in the Focus RS that distributes torque front to rear and side to side won't be used in other vehicles. It's different for Ferrari and Porsche.

Nissan Leaf battery cells put through torture test, live to charge again

One minor chink in the armor of the Tesla Model S is that a small number have caught fire, once their battery packs were penetrated. Nissan Leaf drivers, however, might just be able to weather such an event without an ensuing CarBQ. Our evidence for such a claim? A video that has surfaced of cells from a Leaf pack undergoing a battery of torture tests (pun somewhat-ashamedly intended). Shared by folks at the Hybrid Auto Center in Las Vegas – who offer for sale, among other things, used Leaf lithium battery modules – the footage shows salvaged cells being brutally assaulted with a screwdriver, and later, a propane torch. Granted, these tests are not the same thing as flinging a piece of metal into a working pack at 70 miles per hour, but they do claim to show that a puncture does not always equal a fire. Oh, and don't try this at home. When pierced through by the flat head tool, there is no explosion or eruption of flame. Instead, a rather modest wisp of smoke shyly emerges as the electrolyte next to the shorted area of the fully-charged foil pouch reacts with the influx of oxygen. Again and again, the blade descends, until the cell is riddled with holes. No fire. Amazingly, when connected with a voltmeter afterward there are still plenty of signs of life, and when it is charged and discharged (off-camera), it reportedly suffers only a slight loss of charge capacity. The video goes on to show another cell attacked with open flame with similar results. While the demonstration is, perhaps, somewhat crude, the message it sends is loud and clear: lithium batteries can be safe and rather robust, despite some freak accidents. Scroll below to watch the short presentation for yourself. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.