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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

Nissan could offer plug-in hybrids by 2016

Nissan is recharging the idea of a production plug-in hybrid model. The Japanese automaker may start making a plug-in hybrid by as soon as late 2015, with deliveries to start in time for the 2016 model year, Green Car Reports says, citing an interview with company executive Andy Palmer. Those comments go against what Nissan said during the North American Auto Show in January. Palmer didn't specify what class of vehicle the plug-in hybrid would be, but he said battery-electric vehicles are best suited for cars 3,850 pounds or lighter, according to Green Car Reports. That would imply that the plug-in hybrid powertrain may be used for a mid-sized sedan or a crossover vehicle. Either way, a Nissan PHEV may pair the Nissan Leaf's 108-horsepower electric motor with a gas engine. Whether Palmer's projected timeframe was more of a ballpark estimate is anyone's guess, as the company hasn't made official plans for a 2016 model-year plug-in hybrid, Nissan spokesman Tim Gallagher wrote in an e-mail to AutoblogGreen. Either way, feel free to join us in the comments below. Nissan is coming off its best-ever sale month for the Leaf, which has moved about 115,000 units around the world. Domestic sales of the Leaf in May rose 46 percent from a year earlier to a monthly record 3,117 vehicles. Through the first five months of the year, Leaf sales increased 36 percent, to 10,389 units.

Road & Track names its 2013 Performance Car of the Year

Road & Track recently staged its first annual Performance Car of the Year test, pitting 13 new and updated performance cars against each other on track, then graduating the top six to a road test before picking a winner. Additionally, the magazine staff picked the best automobiles of the year in eight categories.
But first, let's cover the PCotY segment. Here's the list of cars brought to the comparison test: Audi R8 V10 Plus; BMW 435i; BMW M6 Competition Package; Chevrolet Corvette Stingray Z51; Ferrari F12 Berlinetta; Ford Fiesta ST; Jaguar F-Type V8 S; Jaguar XFR-S; Mercedes-Benz E63 AMG S-Model Wagon; Mercedes-Benz SLS AMG Black Series; Mini John Cooper Works GP; Nissan GT-R Track Edition; and Porsche Cayman S.
To find out the results of the comparison, head over to Road & Track's website or check the press release below, where you'll also find the magazine's top-rated vehicles in eight categories. Want more? Head over to the 2013 PCotY hub. But before you do that, take a stab at guessing the winner of PCotY (we'll give you one hint: it isn't a Porsche).