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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:

Mazda rotary engine returning, in an autonomous Toyota delivery vehicle

With the return of the Toyota Supra, the Lotus Esprit and Mazda RX-7 probably share the trophy for hardcore sports cars we'd most like sequels for. The Esprit's too hopeless to consider. Mazda continues to speak in riddles about a new RX-7, but the company has confirmed that the RX-7's heart will return: The company's building a rotary-engined range-extender engine for an autonomous Toyota. At this year's Consumer Electronics Show, Toyota announced its e-Palette autonomous electric delivery vehicle. The e-Palette will come in bus, shuttle, and car versions to service the delivery needs of companies like Amazon, Pizza Hut, and Uber. They'll also be built in custom configurations such as mobile hotel rooms and emergency command centers. Toyota owns 5.25 percent of Mazda, the two automakers recently signed a deal to open a factory in Alabama, and Mazda's known for ace work with small engines. It's not surprising that Toyota chose Mazda for help with the e-Palette, but the rotary aspect is novel. Mazda U.S. president Masahiro Moro said, "This is a very suitable engine to run a generator because it's compact and lightweight, with no noise or vibration, and it has very good fuel economy." There have been rumors of this development previously, as far back as 2016, then again last October in reference to an electric architecture Mazda intended for release in 2019, but Toyota was never mentioned. As to pining for that RX-7 redux, Mazda's head of powertrain said the company's overcome the technical issues of a sports-car-sized rotary engine — the challenge is making a business case for such a sports car. We think the RX-VISION made the case three years ago, and it's already fitted with the Skyactiv-R rotary. Separately, a Toyota spokesman added that the two companies are looking into whether the rotary can be useful beyond the electric car. That's not much to go on when it comes to pining for another RX-7, but hope lives on a scanty diet. Related Video:

Why a production Mazda Koeru won't be a Subaru Outback clone

No automaker has had a hit quite like the Outback Many have entered, few have won. The Subaru Outback is one of those automotive bogeys that competitors seek to imitate but never quite capture. Mazda is poised to change that, its CEO tells Automotive News, with a production version of the Koeru concept. We're torn on whether this attempt will be the one to do it, whether the proposed model is truly aimed at the Outback, or whether it's just another pale imitation destined for failure. While the ingredients are pretty basic – wagon-like shape, extra cladding, a smidge more ground clearance than a regular car – no automaker has had a hit quite like the Outback. Reasons include packaging issues, poor brand fit, and Subaru's seemingly unstoppable momentum in building all-wheel-drive archetypes. That hasn't stopped a bunch of companies from trying. And now for a list: Ford attempted with the Freestyle/Taurus X; note that that model no longer exists, having been replaced de facto by the Flex and the newly crossover-ified Explorer. Audi discontinued the A4 Avant and slapped the Allroad badge and some fender flares on to capture the affluent outdoorsy crowd, initially selling well but now down 40 percent since last year. The humpback Honda (Accord) Crosstour and Toyota Venza could also be considered Outback-apers, as both short-lived models took sedan bodies and added a hatch and optional all-wheel drive. Dodge got into this space a few years back with the Journey Crossroad trim level, but fake brush guards and black wheels do not an Outback make. Volvo has perhaps come closest with the XC70, a not-quite-crossover that it nevertheless brands like its other crossovers. It helps that the Volvo die-hard and the repeat Subaru buyer aren't too different. Most of these models no longer exist, and the ones that do haven't sold as well as Subaru's Outback so far this year. Even if you're generous and add all 96,718 Journey sales (and not just those for the Crossroad, which FCA doesn't break out separately) to V70/XC70, Venza, and Crosstour, it still doesn't equal the 136,227 Outbacks Subaru pushed through November of 2015. And, as Automotive News points out, Mazda hasn't sold that many crossovers so far this year (the number is 129,932 thanks to huge CX-5 numbers). So why is Mazda considering going after the hallowed Outback? First off, we're not sure that it is because there's the question of what tiny niche this vehicle would occupy. "It's a totally new car.