2004 Mazda Rx8 Gt Automatic Gray on 2040-cars

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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.

Mazda CX-30 Luggage Test | How much cargo space?

The Mazda CX-30 is pretty much a lifted Mazda3 hatchback. Same platform, awfully similar dimensions, and the interior's a spitting image (if not identical). Ditto cargo capacity. On paper, the two have virtually the same amount of space behind their raised back seats, with the CX-30 at 20.2 cubic-feet and the 3 with just a teensy less at 20.1.  Now, before I go any further, let's see how much that 20.1 cubic-feet relates to in the Mazda3. I wasn't yet doing this test format back then, hence the video.  For reference, both tests used my standard luggage selection of two midsize roller suitcases that would need to be checked in at the airport (26 inches long, 16 wide, 11 deep), two roll-aboard suitcases that just barely fit in the overhead (24L x 15W x 10D), and one smaller roll-aboard that fits easily (23L x 15W x 10D). The bag of baseballs shown in the video is slightly smaller than my new small-bag go-to, my wife's fancy blue overnight bag (21L x 12W x 12D). So, the mark to beat is therefore all the bags minus the smallest roller.  Here is what 20.2 cubic feet looks like in the CX-30. To move beyond the Mazda3 comparison, that figure is in keeping with the CX-30's niche placement between subcompact (the teens) and compact SUVs (upper 20s to upper 30s). The Mazda CX-5 has 30.9 cubic-feet.  Now, typically, I start off by seeing how much I can fit inside with the cargo cover in place. Sadly, this particular CX-30's cargo cover is missing. We'll just have to hope it doesn't rob the CX-30 of as much space as the CX-5's does.  First off, it's immediately noticed that the CX-30's cargo area is not as long as the 3 hatchback's. The largest bag just barely squeezed inside, whereas there was some room to spare in the 3. Now, let's keep loading.  Whattya know? All of the roller bags fit inside. That includes the smallest one, which didn't fit in the 3, fitting atop the stack with perhaps 30% of it over the back seat line. Now, I could've done the same Tetris stack in the 3, but I'm virtually certain the hatch wouldn't have closed. Advantage, then, to the CX-30 and its extra height.  And surprise, the fancy bag also fits. Technically. It robs rear visibility, is pretty far above the seat line and it just barely fits under the back light. If it was filled, I have my doubts about its inclusion. Nevertheless, with or without it, there's still a bit more space on the right side for that bag of baseballs.  Now let's discuss the power liftgate.

Are you the 2016 Mazda Miata?

Tech nerds are spoiled. Every year, there's a new iPhone that arrives following months and months of breathless speculation and rumormongering. We car folk have a more difficult life, because vehicles with the iPhone's cult-like devotion and following, while plentiful, only receive hefty updates after several years. Case in point, the Mazda MX-5.
There's a new one coming, and much like the iPhone 6, it'll arrive in just a few weeks. So, in lockstep with the tech folk, we're anxiously biding our time and waiting with baited breath for the expected debut date of September 3. Also, like Apple fanboys, we're clamoring over any hint or teaser as to what the next-gen Miata will bring, which is why we're showing you the above image.
That is, allegedly, the new MX-5 hiding under the sheet. Auto Motor und Sport has the image, which according to World Car Fans was released by Mazda. Of course, we've reached out to the Zoom-Zoom brand for verification of its authenticity, and will be sure to update as soon as we hear back.