2005 Mazda 6 I Sport Pkg. 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.

2019 Mazda Miata officially announced with 181 horsepower

It turns out the rumors and leaks are true. The 2019 Mazda MX-5 Miata will indeed get a slight performance increase. This fall, the car's naturally aspirated 2.0-liter inline-four will make 181 horsepower and 151 pound-feet of torque. That's a 26 horsepower and 3 pound-feet bump over the 2018 model. It may not sound like a lot on paper, but consider the fact that it's a nearly 17 percent increase in power in a car that weighs just 2,332 lbs. When the current ND generation debuted a few years back, the Miata actually took a slight hit to power. It was offset by a sizable weight loss program, but it didn't stop people from making a fuss. These days, it's not often that a newer model actually loses power compared to the outgoing car. The new car now makes roughly the same power as the old turbocharged Mazdaspeed MX-5 from 2004. Peak power for the 2019 model comes at 7,000 rpm while peak torque arrives at 4,000 rpm. That's 1,000 more and 600 fewer revs respectively. The Miata's redline is now 7,500 rpm, up from 6,800. It should make the car feel more lively through the rev range and should drop the car's 0-60 mph time back under 7 seconds. The 2019 model only weighs 7-pounds more than the outgoing model, so it's essentially a non-issue. In order to get the extra juice, Mazda engineers did some significant work to the engine's internals. Piston mass has been reduced 27 grams while the connecting rods are down 41 grams. The exhaust system and inner exhaust manifold have been modified to reduce pumping losses by 30 percent. The intake and fuel injectors have been changed, too. A new dual-mass flywheel replaces the single-mass unit. This should help better manage engine vibrations and responsiveness. Lastly, the final drive ratio has been increased from 3.454 to 3.583. Other gear ratios remain unchanged. There are other minor but welcome changes for 2019. The steering wheel now telescopes, a boon for drivers with long legs. The doors are easier to open and feature revised door stops. The cupholders and seat levers have both been updated. Finally, there are new 17-inch wheels and a new brown canvas soft top. How all these changes will affect the car remain to be seen. While many people have been clamoring for more power, some of us here at Autoblog feel the Miata may lose some of its current character with such a significant shift in power and torque. Either way, we're as excited as ever to get behind the wheel. Related Video:

Next-gen Mazda MX-5 Miata mule spied 'Ring testing

Fans of simple, lightweight motoring, rejoice - we now have images of the next-generation Mazda MX-5 Miata undergoing testing at der Nürburgring Nordschleife. Now, to be fair, this isn't some lightly camouflaged example that will give us a great peak of what the next Miata, which will also become the next Alfa Romeo Spider, will look like. This is a mule, with the new bits hidden under a current Miata's body. That doesn't mean there aren't a few scraps of valuable information here, though.
According to our flock of camera-toting spies at the Nürburgring, the next Miata is likely to grow a bit, as new models are wont to do. In particular, it will be longer and wider, and the wheelbase is likely going to be stretched, based on the shape of the wheel wells and doors. Both of those factors will add more space in the cabin.
Those are the big indications provided by these photos, but while the MX-5 might be growing, it's a safe bet based on these images that it, and the (likely pricier) Alfa, will retain the classic, long-hood, short-deck styling that so typifies rear-drive roadsters.