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How Mazda got Skyactiv-X to work is incredible

"Take everything you know about engines and turn it around," Mazda North America Vehicle Development Engineer Dave Coleman says, patiently and with a look of benevolent pity, as he's quizzed about the particulars of the company's new engine. The Skyactiv-X engine is enigmatic — and deceptively simple in operation. And the bottom line for American consumers is that they'll be able to buy a car (or crossover; we don't know yet what vehicle will first get it) by late 2019 that provides diesel-like fuel economy but runs on regular old gasoline. In between diesel and spark ignition, but it's neither To truly understand it, you have to dive into the contradictions. Take that regular old gasoline: Contrary to common sense, the lower the octane, the better it works. In the lab, the Skyactiv-X engine loves 80 octane. The lowest Americans get is 87, so the engine is tuned for that octane. Go higher and you lose some low-end torque. Coleman was right. It's hard to wrap your head around an engine that thrives just at the point when most gas engines would aggressively self-destruct. It uses a supercharger to pump additional air — but not additional fuel. It uses spark plugs to start a combustion cycle that normally doesn't need a spark. And, quixotically, it's not displacing Mazda's own American-market diesel engine, currently languishing in a seemingly endless hell of regulatory approval. More bizarre: Mazda is a tiny automaker facing real existential headwinds, and gasoline compression ignition is a massive challenge. GM and Hyundai announced compression ignition, or HCCI, projects (full name, homogeneous charge compression ignition) to great fanfare, but they never amounted to a production hill of beans, crippled by reliability issues or horrible vibrations. Worse, they only worked at an unusably narrow range — low RPMs and low loads. HCCI research improved direct-injection gas and diesel engine technologies for these companies, but HCCI itself remains untamed. The benefits of lean combustion Why even try to tame HCCI? The answer is much better fuel economy and lower emissions. Less burned carbon-based fuel, less carbon dioxide released. That's simple. But there are some thermodynamic reasons for the lean combustion you can achieve with compression ignition that are worth explaining. The ideal amount of fuel for a conventional engine to burn is about a 14:1 air-to-fuel ratio. That lets every molecule burn nicely, in theory.

Confirmed: Mazda Miata gets more power, higher redline, telescoping wheel

Our friend over at Road & Track, Bozi Tatarevic, has a keen nose for stuff just like today's Miata news, and he spotted an article by the Japanese car magazine Car Watch that details Mazda's upcoming updates. Car Watch actually got to drive the car, too. There's a lot to go through, but the highlight has to be confirmation of what we told you earlier this year about a significant power bump: The Miata will indeed get an increase of 26 horsepower, from 155 to 181. But the power's not the whole story. Mazda has increased the redline from 6,800 RPM to 7,500. It's not clear at this point where torque and power peaks are in the rev range, or how these changes affect low-speed drivability, but more revs are almost always a good thing and aren't likely to detract from the roadster's fundamental goodness. Car Watch reports that lighter pistons and connecting rods are fitted to help reduce rotational mass in the 2.0-liter inline-four. Some valvetrain changes were needed to support the higher redline, mainly stiffer valvesprings to prevent valve float. Mazda also changed the shape of the valves and optimized the intake ports to breathe better at higher RPM. The inner diameter of the exhaust ports were increased to flow better through a new muffler better tuned to the engine's new operating range. This confirms and gives a little more detail to what we reported earlier based on a leaked document from Mazda Canada. Car Watch also confirms that the revised Miata will get a low-inertia dual-mass flywheel, which should help absorb some vibration, noise and harshness from the higher-revving engine without losing too much of the directness that a single-mass flywheel provides. Mazda usually gets stuff like this right, so while we won't know until we get a chance to drive it whether the DMF feels "right," we're not too worried about it. There's also a telescopic steering wheel, a first in any Miata, which has a range of about 1.1 inches. That doesn't sound like much, but it should help folks with longer legs reach the wheel without having to crank the seat forward. Interestingly, Car Watch reports that the telescoping wheel was opposed by some in the company seeking to save every fraction of an ounce of weight, and to get it through, the company apparently had to change some of the material in the upper steering column from steel to aluminum to satisfy the weight-conscious. Little details like these are fantastic.

Mazda previews new CX-9 ahead of LA debut

Mazda will unveil its new CX-9 crossover at the upcoming Los Angeles Auto Show. The teaser rendering above gives us an idea of what to expect. The CX-9 was launched nine years ago. And though it's undergone a series of updates along the way, it's due for replacement. Fortunately that's just what Mazda has in store. We saw that much ourselves in spy photos and videos of the upcoming new model undergoing testing, and the company whet our appetites with the reveal of the Koeru concept at the Frankfurt Motor Show just a couple of months ago. Judging by the rendering above, it would appear that the new CX-9 will draw heavily from that design study in its production form. Naturally some details will be changed along the road from show stand to showroom, including the usual suspects like the wheel size and wing mirrors. Most notable, however, is that while the Koeru concept incorporated five seats, the CX-9 is a seven-seater – and the new model is confirmed to keep that three-row setup. Beyond that, the new CX-9 is set to apply the latest evolution of the company's Kodo design language – as seen on the aforementioned Koeru and sleek RX-Vision concepts – to a larger form. It also promises to feature Mazda's latest Skyactiv technologies to keep it up with the times. For more than that, however, we'll have to wait – but not too long, as the vehicle is set to debut mere weeks from now at the LA show. Mazda to Unveil All-New CX-9 Three-Row Midsize Crossover SUV at Los Angeles Auto Show HIROSHIMA, Japan, Nov. 4, 2015 /PRNewswire/ -- Mazda Motor Corporation announced today it will premiere the all-new Mazda CX-9 three-row midsize crossover SUV at the 2015 Los Angeles Auto Show, which runs from November 20 to 29. Fully incorporating the latest SKYACTIV technologies and KODO—Soul of Motion design, the all-new CX-9 is a high-end model of Mazda's new-generation lineup. The all-new CX-9 builds on the feeling of life imbued by KODO and moves toward a more premium design execution that befits a three-row midsize crossover SUV.