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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:

The Mazda MX-5 Miata is truly a four-season sports car

For all intents and purposes, the Mazda MX-5 Miata is a product of California. I know it says Hiroshima on the shipping container, but the car belongs to the Golden State as it was dreamt up in Irvine and honed its driving skills on the roads near Santa Barbara. And logic would dictate the Miata would be useless in any situation other than direct sunlight. That's what drivers from other states would think, anyway. It's the time of year when those of us from the west coast fly out to places where it's snowy and icy and everyone laughs at us because the cold and white stuff essentially shuts us down. Make fun of Californians driving in the rain or freaking out when the outside temperature dips below 55 degrees. What can we say, we're just out of our element. Perhaps, then, it's surprising the Miata handles snow a lot better than I do. I found this out when Mazda sent me to Crested Butte, CO, for a little fun on a frozen track. Yes, there was a lot of sideways action, but it had more to do with the two California residents inside than with the car. The company really invited journalists to Colorado to get an idea of how its all-wheel-drive crossovers perform when things get snowy and icy. But the real show was watching how we navigated the autocross course they set up for the rear-drive Miatas that Mazda brought along. The Miata had a good heater, but it was my laughter caused by immense admiration that kept me from freezing my fingers off. Armed with a set of Bridgestone Blizzak winter tires, the Miata performs just about how you'd expect it to – if you're light on the gas and quick with the steering and have a good amount of patience in you. It all works well if you're a pro driver, less so if you're not a frequent track visitor, regardless of the weather. But fortunately we were using the fourth-generation Miata, which has to be the most forgiving sports car ever. On pavement, it behaves like a compact hatchback. Put it in sixth and it's relaxed and compliant, with a ride that doesn't beat you up and an engine that knows when you just want to get where you need to go. Provoke it, however, and it rewards you with predictable responses from the controls. It does the same thing on ice, if you have a firm grasp on how a car responds to the frozen stuff. Starts are tricky, even in second gear, if you underestimate the power from the 2.0-liter four.

2019 Mazda 3 recalled because the wheels could fall off while driving

Here’s a recall we had to read twice before believing. Mazda is bringing in 25,003 Mazda 3s that just rolled off the assembly line, because the wheels may fall off while driving. All the Mazda 3s are 2019 model year cars, so itÂ’s only the totally new generation Mazda 3 under the gun here. Thankfully, Mazda says there are no cases of this occurring to owners, and therefore no injuries or deaths related to the issue. As for the cause of the wheel detachment? Mazda put out a statement explaining the issue at hand.  “A manufacturing process error may result in a gap between the wheel hub bolt and hub flange during assembly. This gap causes loosening of the lug nuts though they were initially tightened to the correct specification at the plant. A rattling noise occurs prior to a wheel detachment from the vehicle,” Mazda says. ItÂ’s heartening to see Mazda did in fact tighten the lugs at the factory, but still extremely troubling to see that they can loosen all on their own. Our advice? Walk on out to your shiny, new Mazda 3 and torque those lugs to spec. If you donÂ’t have a torque wrench, then just use the wrench that came with the car to make sure theyÂ’re not loose. Those that have a new Mazda 3 should be on the lookout for a recall notice in the mail. YouÂ’ll then be able to take the car to the dealer for Mazda to fix the problem. Until then, just keep an eye on your lugs. A wheel flying off while driving at speed is always a recipe for disaster, and we sure do enjoy driving the new Mazda 3 at speed.