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2016 Mazda MX-5 Miata first engine shot revealed

We've dug deep for just about every scrap of 2016 Mazda MX-5 Miata info available out of the car's California reveal celebration, but powertrain particulars have been especially hard to come by. While we still don't have engine specifications, the folks over at Autoweek have scored a nice scoop - the first underhood photos of one of the display cars.
In the image above, the ND-generation Miata is clearly shown to be powered by a Skyactiv inline four-cylinder, as expected, but its displacement remains unclear. The engine is most likely either the 2.0-liter Skyactiv-G engine offered in low-end Mazda3 and CX-5 models or the 2.5-liter Skyactiv-G found in those same vehicles' upper trims. In those iterations, the 2.0-liter generates 155 horsepower and 154 pound-feet of torque, while the larger-displacement engine nets out at 184 hp and 185 lb-ft. There is no sign of a turbocharger, a feature rumored to be fitted to at least one test mule. There has also been previous rumors of a 1.5-liter Skyactiv engine, possibly for overseas markets.
The 2.0-liter strikes us as the most likely scenario, particularly as Mazda has worked diligently to save every gram in the new car, dropping a pledged 100 kilograms (220 pounds) over the current model, even while adding content. It's entirely possible that the alleged turbo car was, in fact, a mule for the Miata's Alfa Romeo sister car, which is expected to have a wholly different powertrain. Or it could simply be a second engine option for an eventual Mazdaspeed variant, perhaps.

Mazda Skyactiv-X Review | The revolution begins with a squeeze-bang

The matte black Skyactiv-X prototype looks like a rough Mazda3, perhaps reconstructed after a bad wreck by an over-enthusiastic owner of a spot welder and lots of gaffers' tape. Ribbed ducts poke out of the dash sending two breaths of conditioned air to no one in particular. Even its revolutionary engine, the thing we're here to experience, is entombed in a massive, nondescript cover to mask its unseemly noises. It's a wild, strange way to meet a very unconventional vehicle that promises diesel-like fuel economy, a wide torque band, and an exotic method for burning less gas than ever before. It takes a few hours for Mazda's engineers to explain the fundamental principles of operation. For more detail, read our Skyactiv-X Spark Controlled Compression Ignition explainer, but here's a very brief overview. Skyactiv-X marries some traditional gasoline engine characteristics with a novel form of compression ignition called SPCCI. The key for Skyactiv-X is to use very high compression in the cylinder and an extremely lean fuel-air mixture. Squeezed right to the cusp of getting hot enough to blow up all on its own (which is very hard to predict), a squirt of extra gas and a spark interject to cross that compression-ignition threshold in a controlled and predictable manner. See the animation below: That takes a few essential components to get just right. One is a massive amount of computer processing power and some pressure sensors in the individual cylinders, because the ambient conditions change how and when these things happen. Skyactiv-X uses a clutched supercharger to pump in additional air when needed to nail the mixture precisely, and high-pressure injectors to get the low ratios of fuel to disperse properly in the chamber. And since it operates like a conventional gasoline engine sometimes, it uses valve timing to lower the very high compression ratio so it doesn't reach combustion ignition in that mode. In practice, the Skyactiv-X runs in compression ignition mode most of the time. In practical terms, that means it drives like a torquey gasoline Skyactiv engine. The torque curve is broad and flat — diesel-like in that respect. That also means it can get away with using a six-speed transmission and a lower final drive for better response. There's enough grunt and economy together that Mazda can let the engine spin faster — at 60 mph, it's running at roughly 1,000 more RPM than a similar gas engine, with greater efficiency.

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