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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

2021 Toyota Camry AWD vs. midsize all-wheel-drive sedans | How they compare on paper

Just as crossovers have become the dominant body style in the car market, the all-wheel drive they frequently feature has become more popular. In fact, all-wheel drive is so popular that automakers are increasingly putting it in traditional cars. The latest car to add driven wheels is the 2021 Toyota Camry. It will offer all-wheel drive on most of its trim levels, though only with the four-cylinder engine. It isn't alone in this market, though. So we've compiled the Camry's specifications, along with those of a couple of its competitors for comparison. For the purposes of this analysis, we're sticking with the AWD veteran 2020 Subaru Legacy equipped with a naturally aspirated 2.5-liter engine and the relative newcomer 2020 Nissan Altima. Both are similar in pricing and power to Camry. We've skipped the turbocharged Legacy and the turbocharged Ford Fusion with all-wheel drive as both have higher base prices and significantly more power. We'll take a look at these three sedans engine output, fuel economy, pricing and space. Below is a chart with all the raw numbers, and below that is more in-depth discussion of the cars. Performance and Fuel Economy These sedans are very closely matched, but one area where a clear winner emerges is in output. The Camry has a solid 21 horsepower and roughly 10 pound-feet of torque over the Subaru and Nissan. This, despite all of the engines having the same displacement. That power should make it quicker than the approximately 50-pound-heavier Subaru, though the Nissan Altima may stay with it thanks to its curb weight being about 100 pounds less than the Toyota. Also worth noting is that only the Toyota offers a traditional automatic transmission, whereas the Subaru and Nissan rely on CVTs. Subaru and Nissan have both dramatically improved their CVTs to the point they're quite unobtrusive, but if you strongly prefer the feel of softly shifting gears, the Toyota is your choice. In our experience, all three of these sedans are pleasant to drive with suspension and handling clearly tuned in favor of comfort over quickness. Fuel economy is close to a dead heat. Toyota hasn't announced official fuel economy numbers for the all-wheel-drive model, but we can estimate that, as with most all-wheel-drive variants, mileage will be slightly lower than normal models. We're betting it will only about 1 mpg worse than front-drive variants. That puts it in the same 29 to 30 mpg overall range as the Subaru and Nissan.

Japan plans real-world diesel emissions test after companies fail

Japan's transport ministry plans to start real-world diesel emissions tests after an experiment found four models from Toyota, Nissan, and Mitsubishi that produced more nitrogen oxide (NOx) emissions than the nation's rules allow, according to The Japan Times. Regulators there usually only perform emissions checks in the lab. The VW diesel scandal has everyone double-checking their figures. Diesel versions of the Toyota Hiace van, Land Cruiser Prado, and Nissan X-Trail produced up to 10 times more NOx than allowed. The Mitsubishi Delica D:5 was up to five times over the limit, The Wall Street Journal reports. There was no evidence of defeat devices in the vehicles. Mazda performed well in the experiment, though. The CX-5 passed with nearly the same results on the road and in the lab. The Demio, better known as the Mazda2, did nearly as well with only slighter higher figures in the real world than in the controlled setting. The experimenters theorized the reason for the excessive emissions was that cold weather caused the engines' software to shut off the exhaust gas recirculation to prevent damage, according to the WSJ. However, this behavior also increased NOx production. Toyota, Nissan, and Mitsubishi don't have to worry about punishment from the transport ministry because this check was just an experiment. Their models already passed the mandated lab tests, which was the only requirement, according to The Japan Times. As governments begin greater real-world emissions tests, the results suggests diesels aren't very clean. A recent check in France found models from Ford, Renault, and Mercedes-Benz that didn't perform up to the standards. Regulators in India conducted similar evaluations and ordered VW to recall over 300,000 vehicles. Related Video: