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Sell your own: 2004 Mazda RX-8

Looking to sell your car? We make it both easy and free. Quickly create listings with up to six photos and reach millions of buyers. Log in and create your free listings. Combine "sports car" with "user-friendly" and, in most forums, you have yourself an oxymoron. Sports cars are – by definition – sporty, but rarely do they qualify as easy to use. One that did and, regrettably, has faded from the scene is Mazda's RX-8. Initially launched in 2003, and out of production within roughly a decade, the RX-8 was perhaps the rotary-powered answer to a question few – at the time – were asking. Happily, Mazda produced it anyway. With its front mid-engined platform, freestyle doors and +2 seating, the RX-8 came as close to offering day-in, day-out utility as anything this side of an extended-cab pickup. And its nod to practicality did little, if anything, to diminish the essential goodness of the menu. Mazda's design team provided a high-revving rotary, nimble handling and almost telepathic steering, combining them into a frenzy-filled dollop of locomotion. The result was no more than mildly fast and furious, but in properly motivated hands the RX-8 delivered a high level of entertainment for a relatively modest outlay. This for-sale example, a 2004 RX-8 with automatic transmission, requires just $6,000 and – not incidentally – the ability to buy into its premise. The automatic will be perceived by many to be a negative, but might also suggest a more gentle ownership history. And without benefit of a clutch and shifter, the new owner can concentrate on the driving, with the Mazda's absurdly direct steering and slot-car cornering. The asking price is on the high side (book average is about $5K), but know that similar cars might bring upwards of $8,000. And at 91,000 miles it's been used, but perhaps not used up. Related Video: Mazda Used Car Buying Buying Guide Ownership Coupe Performance

Next-gen Mazda MX-5 could use carbon fiber to cut weight

The current Mazda MX-5 Miata has only been out for a few years, but the automaker is allegedly looking for ways to lighten the next one. According to a report from Autocar, Mazda is looking to carbon fiber to help the next-generation MX-5 cut weight and use a smaller engine. Despite having more safety features, modern amenities, and a stiffer body, the current MX-5 is the same size as the original sports car from 1990 and weighs less than its immediate predecessor. In a recent interview with Autocar, Nobuhiro Yamamoto, head of the Miata program, revealed that the next generation of the Miata will probably stay the same size, but could be even lighter thanks to the utilization of carbon fiber. The current MX-5 uses high-strength steel and aluminum, and Mazda doesn't use carbon fiber in any of its cars. Carbon fiber is expensive to incorporate into road-going vehicles, and so Yamamoto notes that Mazda has been hard at work making it more affordable. A lighter car could result in a smaller engine, Yamamoto said. In the US, the MX-5 comes with a 2.0-liter four-cylinder engine that makes 155 horsepower, while the Japanese and European version comes with a 1.5-liter, 130-hp engine. A smaller engine would make the sports car even lighter. It's unknown at this time if the automaker is collaborating with another automaker or a supplier to make produce carbon fiber, or if it'll make it in-house. There's no word on how much carbon fiber the next MX-5 will wear or how it will affect the sports car's price. Autocar reports that the next MX-5 won't arrive anytime before 2021, which could make the ND MX-5's lifespan an unusually short five years long. With cars getting heavier, it's nice to hear that Mazda is working on finding a way to make its lightweight sports car even lighter. Related Video: News Source: AutocarImage Credit: Mazda Mazda Convertible Coupe Lightweight Vehicles

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.