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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.

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:

Chicago Auto Show page claims 2016 Mazda MX-5 Miata to produce 155 hp [UPDATE]

UPDATE: Mazda wasn't willing to confirm or deny the figures cited by the Chicago Auto Show, although we're betting the 155-horsepower figure is a bit on the low side. As for the CAS page, a Mazda spokesman told Autoblog that they "aren't sure where they got that number." The horsepower estimate has since been pulled down. Well, someone may have made a boo-boo. The Chicago Auto Show is currently hosting a page that claims the Mazda MX-5 will produce 155 horsepower, courtesy of a 2.0-liter, Skyactiv four-cylinder. If this is correct, it'd be the first time the MX-5's US power output had been revealed. The 155 hp figure would account for a 12-hp drop from that of the outgoing MX-5, though, a corresponding weight loss should still improve the power-to-weight ratio for the 2016 model. Now, the CAS page could simply be following previous reports, including one from Autoblog. As recently as October, it was being reported that the MX-5 would be powered by a 2.0-liter, Skyactiv four-cylinder, a version of which is producing 155 horsepower and 150 pound-feet of torque in the Mazda3. Naturally, we've reached out to Mazda for comment – or perhaps even confirmation – on the info from CAS, although we aren't expecting a reply until at least later this morning (darn time zones). Of course, as soon as we hear anything, we'll update this story. Related Video: