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How Mazda got Skyactiv-X to work is incredible

"Take everything you know about engines and turn it around," Mazda North America Vehicle Development Engineer Dave Coleman says, patiently and with a look of benevolent pity, as he's quizzed about the particulars of the company's new engine. The Skyactiv-X engine is enigmatic — and deceptively simple in operation. And the bottom line for American consumers is that they'll be able to buy a car (or crossover; we don't know yet what vehicle will first get it) by late 2019 that provides diesel-like fuel economy but runs on regular old gasoline. In between diesel and spark ignition, but it's neither To truly understand it, you have to dive into the contradictions. Take that regular old gasoline: Contrary to common sense, the lower the octane, the better it works. In the lab, the Skyactiv-X engine loves 80 octane. The lowest Americans get is 87, so the engine is tuned for that octane. Go higher and you lose some low-end torque. Coleman was right. It's hard to wrap your head around an engine that thrives just at the point when most gas engines would aggressively self-destruct. It uses a supercharger to pump additional air — but not additional fuel. It uses spark plugs to start a combustion cycle that normally doesn't need a spark. And, quixotically, it's not displacing Mazda's own American-market diesel engine, currently languishing in a seemingly endless hell of regulatory approval. More bizarre: Mazda is a tiny automaker facing real existential headwinds, and gasoline compression ignition is a massive challenge. GM and Hyundai announced compression ignition, or HCCI, projects (full name, homogeneous charge compression ignition) to great fanfare, but they never amounted to a production hill of beans, crippled by reliability issues or horrible vibrations. Worse, they only worked at an unusably narrow range — low RPMs and low loads. HCCI research improved direct-injection gas and diesel engine technologies for these companies, but HCCI itself remains untamed. The benefits of lean combustion Why even try to tame HCCI? The answer is much better fuel economy and lower emissions. Less burned carbon-based fuel, less carbon dioxide released. That's simple. But there are some thermodynamic reasons for the lean combustion you can achieve with compression ignition that are worth explaining. The ideal amount of fuel for a conventional engine to burn is about a 14:1 air-to-fuel ratio. That lets every molecule burn nicely, in theory.

Mazda still has a team working on rotary engines

The flame still burns within Mazda to stage a rotary engine revival. Before you start getting excited, it's way too soon to start saving money for the fabled, next-gen RX-7 or RX-8. Still, company boss Masamichi Kogai confirmed to Autocar that the Japanese automaker has an engineering team dedicated to improving the Wankel. This development group has the hard task of trying to make the rotary stack up to modern internal combustion engines in terms of emissions and fuel-economy standards. Neither factor were ever exactly Wankel's strong suits. Kogai described them as working "very enthusiastically" to Autocar. The boss didn't discuss any future RX-vehicles or the size of the team, however, a report from last year indicated that there were 30 engineers in partnership with universities to update the engine's design. After problems keeping up with emissions and fuel economy, Mazda built it's last rotary for an RX-8 in June 2012. Since then, there have been intermittent rumors of a return. One possible solution was a design called the 16X that was supposed to offer more torque and better fuel economy. Another possibility was a small-displacement unit as a range-extender in an electric Mazda2. Rumors of a new RX-7 have been heard for years. In 2013, Kogai clearly said that it wasn't happening. When asked again last year, he reiterated the same point.

Import pickup truck-killing Chicken Tax to be repealed?

After over 50 years, the so-called Chicken Tax may finally be going the way of the dodo. Two pending trade deals with countries in the Pacific Rim and Europe potentially could open the US auto market up to imported trucks, if the measures pass. Although, it still might be a while before you can own that Volkswagen Amarok or Toyota Hilux, if ever. The 25-percent import tariff that the Chicken Tax imposes on foreign trucks essentially makes the things all but impossible to sell one profitably in the US, which lends a distinct advantage to domestic pickups. Both the Trans-Pacific Partnership with 12 counties and Transatlantic Trade and Investment Partnership with the European Union would finally end the charge. According to Automotive News though, don't expect new pickups to flood the market, at least not immediately. These deals might roll back the tariff gradually over time, and in the case of Japan, it could be as long as 25 years before fully free trade. Furthermore, Thailand, a major truck builder in Asia, isn't currently part of the deal, and any new models here would still need to meet safety and emissions rules, as well. Automotive News gauged the very early intentions of several automakers with foreign-built trucks, and they weren't necessarily champing at the bit to start imports. Toyota thinks the Hilux sits between the Tundra and Tacoma, and Mazda doesn't think the BT-50 fits its image here. Also, VW doesn't necessarily want to bring the Amarok over from Hannover. There is previous precedent for companies at least considering bringing in pickup trucks after the Chicken Tax's demise, though. The Pacific free trade deal could be done as soon as this fall, while the EU one is likely further out, according to Automotive News. Given enough time, the more accessible ports could allow some new trucks to enter the market.