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Mazda Skyactiv-X Review | The revolution begins with a squeeze-bang

The matte black Skyactiv-X prototype looks like a rough Mazda3, perhaps reconstructed after a bad wreck by an over-enthusiastic owner of a spot welder and lots of gaffers' tape. Ribbed ducts poke out of the dash sending two breaths of conditioned air to no one in particular. Even its revolutionary engine, the thing we're here to experience, is entombed in a massive, nondescript cover to mask its unseemly noises. It's a wild, strange way to meet a very unconventional vehicle that promises diesel-like fuel economy, a wide torque band, and an exotic method for burning less gas than ever before. It takes a few hours for Mazda's engineers to explain the fundamental principles of operation. For more detail, read our Skyactiv-X Spark Controlled Compression Ignition explainer, but here's a very brief overview. Skyactiv-X marries some traditional gasoline engine characteristics with a novel form of compression ignition called SPCCI. The key for Skyactiv-X is to use very high compression in the cylinder and an extremely lean fuel-air mixture. Squeezed right to the cusp of getting hot enough to blow up all on its own (which is very hard to predict), a squirt of extra gas and a spark interject to cross that compression-ignition threshold in a controlled and predictable manner. See the animation below: That takes a few essential components to get just right. One is a massive amount of computer processing power and some pressure sensors in the individual cylinders, because the ambient conditions change how and when these things happen. Skyactiv-X uses a clutched supercharger to pump in additional air when needed to nail the mixture precisely, and high-pressure injectors to get the low ratios of fuel to disperse properly in the chamber. And since it operates like a conventional gasoline engine sometimes, it uses valve timing to lower the very high compression ratio so it doesn't reach combustion ignition in that mode. In practice, the Skyactiv-X runs in compression ignition mode most of the time. In practical terms, that means it drives like a torquey gasoline Skyactiv engine. The torque curve is broad and flat — diesel-like in that respect. That also means it can get away with using a six-speed transmission and a lower final drive for better response. There's enough grunt and economy together that Mazda can let the engine spin faster — at 60 mph, it's running at roughly 1,000 more RPM than a similar gas engine, with greater efficiency.

2014 North American Car and Truck/Utility of the Year finalists announced [w/poll]

The 2014 North American International Auto Show is right around the corner, which means it's high time we found out which cars and trucks would be finalists for the prestigious North American Car and Truck/Utility of the Year awards.
The finalists - three in cars and three in three trucks/utilities - are dominated by American brands, with two-thirds of the finalists hailing from either General Motors or Chrysler (don't worry Ford, there's always next year), while outliers from Mazda and Acura can be found in each contest. Here now is the list of finalists for the big prizes:
2014 North American Car of the Year:

Mazda RX-9 could be a 400-hp, 2,900-pound coupe due in 2019

Mazda poured fuel on the white-hot rumors of an RX-8 successor with the RX-Vision earlier this year. The long, low rotary-powered coupe was lovely, but as we reported, it wasn't going to happen. But now, there's another chapter in the RX rumormill, and like overnight parts, it's from Japan. Japanese site Holiday Auto claims that Mazda will debut the so-called RX-9 at the 2019 Tokyo Motor Show. But before that happens, the Zoom-Zoom company will preview the production model with a concept at next year's Tokyo Motor Show. 2017 is important, marking 50 years since Felix Wankel had the screwy idea for his eponymous engine and 40 years after the company's first rotary powered car, the Cosmo, hit the market. Exciting as Holiday Auto's report is, the stats on this long-rumored car are better – via Google Translate, the Japanese site claims the RX-9 will use a 1.6-liter, two-rotor Wankel with a single turbocharger. It's good for around 400 horsepower. Holiday Auto isn't exaggerating when it claims the car could have "bike-like acceleration." As with other Mazda products, a low curb weight is key, which is why engineers are targeting a meager 1,300 kilograms (2,866 pounds) for the production model – that weight should be pretty evenly split, too, thanks to a rear transaxle. So yes, the RX-9 will be stupid fast and extremely agile. But it will come at a cost. And by cost, we mean that the RX-9 will start just south of eight million yen. That's $79,641 at today's rates, or enough to purchase about 2.5 RX-8 R3s, the hardcore handling trim of Mazda's last-gen rotary car. And if Mazda follows Nissan's GT-R pricing model, we'll see a six-figure RX-9 by 2025. When it comes to Mazda rotary rumors, grains of salt are a must. That's doubly true when we're talking about a possible concept that won't debut for over a year. But with the RX-Vision, Mazda showed that it hasn't abandoned rotary power, and with 2017 marking a big anniversary for the technology, it seems unlikely that the company will let the date pass without some acknowledgement. A concept car seems like a solid bet. Related Video: