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Mazda's next-gen SkyActiv engines will drop spark plugs in favor of high compression

Homogeneous charge compression ignition, or HCCI, is the black art of internal combustion engines that aims to produce diesel-like fuel efficiency for the cost of gasoline. Although some of its competitors have developed and subsequently given up on the tech, Mazda confirmed that the next-generation of SkyActiv engines will employ HCCI technology, improving fuel economy by 30 percent and at the same time reducing exhaust emissions. According to Nikkei, a new SkyActiv family of engines is set to debut under the hood of the next-gen Mazda3 sometime in 2018 before making its way into other vehicles. In simple terms, an engine that uses HCCI burns the air/fuel mix using pressure instead of with spark plugs, just like a diesel. At 14:1, Mazda's gasoline engines already have some of the highest compression ratios out there, but a move to HCCI means cranking up the compression to 18:1. While the tech sounds relatively straightforward, using HCCI means dealing with a number of side issues. It's one of those "on paper" ideas that compounds problems when put into practice. Heat, revs, and fuel must all be carefully managed as gasoline doesn't burn the same way as diesel. Mazda is mum on details, but the automaker seems confident that the issues have been sorted. If the new engines do indeed make it to market with HCCI, Mazda will have out-engineered GM, Daimler, and Hyundai, all of which have tried and failed to develop HCCI engines in a cost-effective package. With the market moving towards electrification, it's interesting to see Mazda still focusing so heavily on traditional internal combustion gasoline engines. It's an indication of where they see the market heading for the next few years. Although the automaker has been hesitant to move forward with hybrid and electric powertrains, Nikkei also reports that Mazda will begin mass production of EVs in 2019. Related Video:

This is what a 1,200-hp twin-turbo 4-rotor looks like in a Miata

We've seen the diminutive Mazda MX-5 Miata swallow plenty of big engines, but New Zealand drifting ace "Mad Mike" Whiddett is roaring into where-no-man-has-gone-before territory. Wanting to replace his 515-horsepower "MADBUL" RX-7 and its twin-turbocharged, three-rotor 20B engine, his new ride is an NC-series Miata with four rotors and twin Garrett turbochargers courtesy of Pulse Performance Race Engineering. It is called "RADBUL," and expected power at standard boost is 1,200 hp, but the builders at Pulse Performance think it will get up to 1,500 hp at full boost. And yes, that exhaust exits through the hood. Four-rotor engines are actually popular - builds are detailed on forums like this one from 2007 and this one from 2008, this UK company or this Canadian company will sell you one complete - but they're usually being prepped for an RX-7. Mad Mike's choice of a Miata for this enterprise makes this about as extreme as you can get, short of throwing it into a Mazda R360. You can watch Mad Mike tell the story of the build in the video, and check out the first and second installments about the build on the Red Bull site.

Mazda hopes to return to Le Mans

Mazda has been away from the winner's circle at Le Mans for some time now. But it could be preparing a return to the forefront at the famous French endurance race in the near future. That is, at least, if the racing enthusiasts within its ranks get their way. "I know that the expectation for us to return to Le Mans is high. I can imagine a day when Mazda returns," Nobuhiro Yamamoto told Top Gear at the Goodwood Festival of Speed this past weekend. "I hope - as with many other Mazda fans - that we go back to Le Mans." His words hardly serve as confirmation of the Zoom-Zoom brand's intentions, but they certainly speak rather loudly to a desire within its ranks. They hardly come out of left field, either. Yamamoto-san is arguably the man best positioned to spearhead such a campaign – or would at least be best informed if such a campaign were underway. He's currently the program manager for the MX-5, and decades ago was the racing engineer behind the 787B. That Group C prototype racer represented Mazda's last major effort at taking top honors at Le Mans, and take them it did when it won the race outright in 1991. The Japanese automaker was out in force this past weekend at Goodwood, the event's central sculpture honoring Mazda's racing history, and its presence only fueling rumors that it could be preparing a renewed assault on endurance racing – potentially once again under rotary power. The 787B, motorsport history buffs will tell you, represented the first and last time to date that a Japanese manufacturer won the 24 Hours of Le Mans. Although Toyota has been competing with Audi and Porsche at the front of the field with the TS040 Hybrid, it has yet to win the key race, despite having taken the FIA World Endurance Championship last year. "Everyone at Mazda would love to see the only Japanese company to ever win the 24 Hours of Le Mans return to the famed twice-around-the-clock classic," a spokesman for Mazda's North American motorsports department told Autoblog by correspondence. "Whether that'll actually happen isn't something we can discuss at this time, but, given our historical and current involvement in motorsports, our interest in the event should be no surprise to anyone. We agree with Yamamoto-san when he says he hopes it happens." So while Mazda may not be ready to confirm the prospect of its return to Le Mans, it certainly isn't ruling it out, either.