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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

Ghosn: Restoring Mitsubishi's reputation is biggest challenge

After news that Mitsubishi falsified its fuel economy data on every vehicle it has sold in Japan since 1991, and the tumble in the company's value that followed, the troubled carmaker has an unlikely savior. Nissan has confirmed it will purchase over one third of Mitsubishi's stock, or 34 percent. The stake is valued at $2.2 billion. Ghosn says making Mitsubishi a part of the Renault-Nissan alliance will save billions in development costs. But the merger certainly isn't without challenges. "The biggest challenge is to support Mitsubishi changing itself and growing and being profitable and restoring its reputation," said Ghosn. Nissan is a natural partner for Mitsubishi, and since the fuel economy scandal escalated from discrepancies in the data regarding Mitsubishi-manufactured, Nissan-badged Japan-market vehicles, it makes sense for the company to sweep in and save the day. Nissan itself is partially owned by Renault, and Nissan has a 15-percent stake in the French automaker. Mitsubishi's chairman, Osamu Masuko says that the merger was inevitable, that it "would have happened one day" anyway, according to the New York Times. Carlos Ghosn, chairman of both Nissan and Renault, is confident they will be able to turn Mitsubishi's fortunes around. "We have the track record to make it work", Ghosn said, referring to the Renault-funded rescue of Nissan in the early 2000s. Related Video:

Here are the best-selling cars and trucks from January 2015

Every month, Autoblog slogs through all the sales figures reported by automakers that do business in the United States, and, after a little bit of sorting, we put it into an easy-to-read chart in an attempt to make it as easy as possible to follow the ins and outs of sales and shipments. But that only covers the brands themselves, not the individual models they sell. And we think you'd all be interested in knowing which vehicles beat their rivals in sales from month to month, so we've put together this handy gallery to keep you in the know. While the leader of the pack may not come as much of a surprise, the order that the top ten finishes in changes frequently – due to automaker deals, the price of gas, etc. – and we've included some statistics to help you see how their current performance stacks up to month's past. Click here to see January 2015's Top Ten Best-Selling Cars And Trucks In America. By the Numbers Chevrolet Ford GM Honda Nissan RAM Toyota Car Buying