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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

2013 Nissan Pathfinder drivers reporting loss of power, 'shuddering' [w/video]

No one appears to have a handle on the numbers, but more than a few owners are registering the same complaint about the CVT-equipped 2013 Nissan Pathfinder: that it "shudders" and loses power when accelerating from a standstill or at low speeds. According to posters at places like Pathfinder Talk, Edmunds, Auto Recalls for Consumers and About Automobile, it happens between about 20 to 40 miles per hour, the sensation is described as being like "driving over a rumble strip" and the power loss occurs for about three to four seconds.
ABC 13 in Houston rode with Pathfinder owner Marlise Holzworth to experience the issue, Holzworth saying that it feels like her vehicle is about to stop when the shudder occurs. Nissan responded to the report, saying that, "A new part has been developed for 2013 Pathfinders that exhibit symptoms similar to those Ms. Holzworth describes. The necessary part should be available at Nissan dealers in June."
Likewise, according to a post on the PathfinderTalk forum, user Krsin97 was informed by a Nissan engineer in April that "[We] are aware of the problem and Nissan is working on update that will come out at the end of June to eliminate the problem."

Nissan VP suggests next Z will offer multiple engines

Roel de Vries, the corporate vice president and global head of marketing and brand strategy for Nissan, told Australia's CarAdvice that as far as he's concerned, any engine in the 370Z "[needs] to deliver on what the car stands for and if the 370Z stands for real performance and real driving I think it doesn't need a V6 to do that." At first read, it could look like de Vries is softening us up for a next-generation Z that doesn't come with a V6, a move that would disappoint a lot of the coupe's fans. Or, what if de Vries was actually getting us ready for a Z with multiple engine options, instead of only a V6, in order to expand its global appeal? That appeared to be the gist of his comments, the exec saying that they couldn't sell a V6-engined Z in Europe, but even if they offer a four-cylinder there, the V6 could live on because, "why should we give it up?" With the coupe's current name a factor of the 3.7-liter displacement of it's V6, though, what is the future for a car with several engine options? Said de Vries, "We [will] definitely keep the Z name, but when we did 350 to 370 it was because of the capacity, but who says the next-generation doesn't have three engines and its not just called Z?" This kind of talk has been going on all year, the real question being how many engines will the car get and what's the endgame. At the beginning of the year, ex product chief Andy Palmer said the car codenamed Z35 would use a "downsized four-cylinder turbocharged engine." In August, Motor Trend reported that the next Z would offer "a mixture of smaller but powerful engines," including a hybrid, but that a V6 would remain the headliner. Two weeks later, MT said that Nissan wanted to transition customers from the naturally aspirated V6 to a turbocharged four-cylinder with the same power, eventually, but would begin with both on the menu. Parallel to that are Shiro Nakamura's out-loud musings about how to merge the next Z and the IDx concepts into "a more affordable, more approachable sports car." The answers, whatever they are, will be a big deal for the brand.