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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

Renault keeps 15% stake in Nissan, transfers majority of shares to French trust

Renault and Nissan completed a landmark deal to rebalance their 24-year-long alliance, paving the way for a new relationship after years of acrimony between the two partners. The automakers on Wednesday announced the creation of a French trust to which Renault transferred 28.4% of Nissan shares. The companies first disclosed plans for the trust in January. Renault Group and Nissan now have a cross-shareholding of 15% with lock-up and standstill obligations, the companies and junior alliance partner Mitsubishi Motors Corp. said in a statement. Renault managers in recent weeks have reiterated that staff should no longer share information with their Nissan counterparts, according to people familiar with the situation, after the French carmaker announced in September that aspects of the alliance would be unwound by year-end.  Taken together with the deal to equalize their cross-shareholdings at 15%, the developments are the clearest indications yet that members of one of the world’s biggest automotive tie-ups are increasingly going their separate ways. Renault told employees in September it was moving away from common structures with Nissan in favor of a new, project-by-project approach to working together. The dissolution of the companiesÂ’ joint purchasing organization means the two will no longer pool information on a regular basis due to antitrust concerns. The sell-down of shares held by the trustee will be coordinated with Nissan, which will have the right of first offer to purchase the stock. The trust will have no obligation to sell the shares within a specific or pre-determined period of time. The new alliance deal presented to investors in London in February followed months of tense negotiations that nearly collapsed late last year due to sticking points on intellectual property and disagreement over the valuation of RenaultÂ’s electric-vehicle and software arm Ampere, in which Nissan has agreed to invest. The alliance dates back to 1999, when Renault rescued Nissan with a cash injection and the two formed one of the biggest auto partnerships in the industry. Rivalries and mutual suspicion mounted over the years and came to a head when former leader Carlos Ghosn openly contemplated merging the two companies, contributing to his downfall.

Pontiac Aztek enjoys rebirth thanks to Millennials

Apparently, Millennials – those between 18 and 34 – aren't afraid to look different on the road, and they like performance, too. A new study by Edmunds is discovering some surprising vehicle choices by this group. Among them, the long-derided Pontiac Aztek is getting a new day in the sun with 25.5 percent its buyers coming from this generation in the first half of 2015. For comparison, Millennials represent an average of 16.8 percent of used car purchases. The Aztek is slowly shaking its reputation as a styling abomination, which seems tied to its appearance on Breaking Bad. The show premiered in 2008, and the Pontiac has been on this list for four of the past five years, according to Edmunds. It even led the pack in 2010. A recent Retro Review from MotorWeek also showed that the crossover wasn't always so hated. While it's still a shock to see the Aztek on any popularity list, the awkward-looking crossover only ranks sixth among Millennials. The vehicle with the biggest portion of buyers from the generation is the Dodge Magnum with 27.6 percent. According to Edmunds, the bluntly styled wagon is especially popular in Detroit and Chicago. The Chrysler Pacifica comes in a close second at 27.3 percent. When it comes to used cars, value and utility appear to trump just about anything else for many Millennial buyers," Edmunds analyst Jeremy Acevedo said in the report. Young buyers aren't afraid of sporty rides, either. The Subaru WRX has 26.4 percent Millennial buyers to rank third place on the list, and the Volkswagen R32 takes fifth at 25.7 percent. Just a few points lower in seventh place is the Nissan GT-R at 25.4 percent, and the final performance machine in 10th place is the Lexus IS-F with 24.7 percent. Related Video: