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Watch what happens inside a rotary engine

Since it looks like Mazda may very well revive the Wankel rotary engine as a range extender for electric cars, there's no better time to become reacquainted with the quirky internal-combustion engine. And there's hardly a better way to become reacquainted than by peering into a running rotary engine, which you can do with the video above. The video comes to us from the YouTube channel Warped Perception. The channel has already shown what happens inside a conventional internal-combustion piston engine by putting a clear cylinder head on top of a flathead engine. This new video shows off the rotary engine by adding a clear side to a tiny model-airplane engine, something that we weren't aware existed and are glad to know about now. Despite the tiny size, the engine is functionally almost exactly like the bigger versions you'll find in Mazdas from about 1967 to 2012. It has intake and exhaust ports on the edges of the rotor housing, and the triangular rotor swings about in a peanut-shaped housing. For maximum effect, jump to right around the 7:40 timestamp. This is the point at which a bit of acetylene is added to the air-fuel mix for a brighter flame. It's at this point that you can really see when the mixture combusts and how the pressure of the flame pushes the rotor to produce rotational motion. Each stage of the video does slow things down to make everything as clear as possible. Even if you already knew how rotary engines worked, it's still fascinating to watch, first because it's something you don't get to see usually, and also because of the engine's elegant simplicity. Related Video: Image Credit: YouTube / Warped Perception Weird Car News Mazda Technology Videos rotary rotary engine

2019 Mazda3 fuel economy announced for AWD, hatchback models

Although Mazda engineers gave us fuel economy numbers for one configuration of 2019 Mazda3 at the car's Los Angeles debut, there were still a few versions left out. Now Mazda has released the data for every body style, drivetrain and transmission configuration. That includes the all-new all-wheel-drive iteration, which we will have a full review of this week. Discerning these numbers is a tad tricky since there are three powertrain combinations for each 2019 Mazda3 bodystyle, and they all get slightly different fuel economy. We've listed the different combinations in a chart below: There are a few key takeaways, the first being that the sedan is always the most efficient version of the Mazda3, likely because of better aerodynamics compared to the hatchback. Second, all-wheel drive will cost you fuel economy due to the extra weight of the axles and differential, and the added drag on the engine. Third, the most efficient versions of each body have the same fuel economy numbers as the outgoing Mazda3. The manual transmission-equipped Mazda3 has actually improved fuel economy over the old version by 2 mpg on the highway, and 1 in combined driving. Also worth noting is that only one trim level of the sedan is available with cylinder deactivation and front-wheel drive, and that's the top-level Premium trim. Opting for all-wheel drive on any trim or body style will come with an engine with cylinder deactivation. The hatchback is also the only Mazda3 available with a manual transmission, and it's only offered on the front-drive version.

2019 Mazda CX-5 Turbo First Drive Review | Two-row crossover perfection

Listen: If you're shopping for a crossover, and by all accounts most Americans are, there is no better option on the market than the 2019 Mazda CX-5. When we test drove the all-new 2017 CX-5, we were astounded by its marked improvements over the already-great previous generation. We noted then its biggest drawback was its average 187 horsepower. The CX-5 didn't feel slow, and it certainly made up for it in other ways, like by delivering superior road-hugging abilities. But, it was probably enough to turn off buyers who do their shopping by analyzing spec sheets. For 2019, Mazda addressed that exact issue with a vengeance. With an all-new 2.5-liter SkyActiv Turbo good for 250 horsepower, the CX-5 not only leapfrogs bestselling rivals like the Honda CR-V and Toyota RAV4, but lands squarely in the realm of luxury stalwarts such as the Audi Q5 and BMW X3. When we drove the 2017 CX-5, we likened the handling to that of a Porsche Macan. Now it has the power to match. Among its direct competition, only the 2019 Toyota RAV4 breaks the 200-horsepower mark, ringing in at 203 (and the Hybrid makes an even more impressive 219 ponies), while the Honda CR-V, Subaru Forester and VW Tiguan all sit between 180 and 190. Now, to get the full herd you must fill the tank with 93 octane premium, but if you don't mind leaving a few ponies in the stable you can pump 87 octane for a slight dip to 227 horsepower. The engine adjusts with no ill effects. Even better, torque stays the same no matter what, and the stump-pulling 310 pound-feet of torque comes quick at just 2,000 rpm. The SkyActiv turbo is full of clever engineering tricks, too. There's an exhaust port restrictor, for instance, a narrower channel used only at low engine speeds. Mazda engineer Dave Coleman likened it to a thumb over a firehose, making more exhaust pressure at idle to spool up the turbo, and thus delivering more oomph when you take off from a standstill. Mazdafarians will recognize the mill as the same one that debuted on the 2018 Mazda6. It powers the CX-9 too, Mazda's highly acclaimed three-row crossover. The 3,825-pound CX-5 has 558 fewer pounds to shuffle around than its larger stablemate, making it downright snappy. However, that extra pep does come with a fuel economy penalty, 22 city and 27 highway mpg versus the naturally aspirated version's 24 city and 30 highway mpg.