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What a 181-horsepower 2019 Mazda MX-5 Miata means for us, and you

Last month, we reported on a VIN filing dug up by Road & Track that showed that the 2019 Mazda MX-5 Miata's 2.0-liter Skyactiv-G engine would get a power bump, from 155 to 181 net horsepower. As for how the 2019 Miata would make that extra power, we heard rumors it'd utilize a new cylinder head allowing higher revs, accounting for that extra power. Now we have what appears to be a leaked document from Mazda Canada showing exactly where that extra power comes from. According to the document posted at Miata.net (registration required to see the image), Mazda will alter camshaft lift and valve size on both the intake and exhaust side, fit freer-flowing exhaust, and smooth and enlarge the piping on the air intake side. There are also internal engine modifications: lighter pistons with lower crowns for better swirl in the combustion chamber, lighter connecting rods, and a crankshaft balanced for higher-RPM operation. All those extra revs mean extra vibration and noise, so Mazda will ditch the single-mass flywheel for a "low-inertia" dual-mass flywheel – which will attempt to find a nice balance between DMF damping action and SMF directness. Overall, it's a pretty serious engine revision with some driveline changes that will heavily affect the driving characteristics of a fantastic driver's car. Contributing Editor James Riswick and Senior Editor Alex Kierstein, both well versed in Miatas past and present, are here to analyze what this could mean for the little roadster. James Riswick: I don't know much about them lighter crank combustion rods, but I for one welcome the news of more power to the Miata. The jump from 155 to 181 seems like a very prudent Mazda-like thing to do, accomplishing that task through various aforementioned technical wizardry as opposed to slapping on a turbocharger, exclaiming "yee-hah" and calling it a day. Alex Kierstein: That's true. I'm wary of additional power, but you do make a good point that at least this is the right way to do it. Going all-motor will keep the bright responsiveness of the engine intact. But higher revs might make power delivery peakier. Frankly, I'd be ok with moving the torque and horsepower peaks up a bit in the rev range, making it a bit more work to access the engine's sweet spot. The dual-mass flywheel should also help if low-end torque suffers, so less stalling in traffic. JR: Did wonders in the 911 and 718s.

Mazda Slovakia brochure reveals Skyactiv-X Euro power numbers

After driving a prototype of Mazda's Skyactiv-X engine in a Mazda3 in January last year, we wrote, "If you want to talk numbers, they're understandably fuzzy. The Skyactiv-X tune isn't final yet, so horsepower and torque figures are a moving target." They're no longer fuzzy in Slovakia, where a brochure for the new Mazda3 sells final figures as 181 metric horsepower and 222 Newton-meters, or 178 horsepower and 164 pound-feet. We don't know the Slovakian engine's displacement. If that Skyactiv-X is a 2.0-liter, it compares to our 2.0-liter Skyactive-G in the Mazda3 that makes 155 hp and 150 lb-ft, or the tuned Skyactiv-G in the 2019 Miata that makes 181 hp and 151 lb-ft. According to the spec sheet on the Slovakian Mazda site, their 2.0-liter Skyactiv-G in the CX-3 makes 148 hp and 152 lb-ft, and in their Mazda6 makes 162 hp and 155 lb-ft. According to the brochure, those numbers will rise to 164 hp and 157 lb-ft in the coming Mazda3. The Skyactiv-X numbers are in sight of what reps at Mazda in California gave us for output during our drive, which was closer to 190 hp and 180 lb-ft. Mazda said at the L.A. Auto Show last year that the Skyactiv-X would launch in markets with stricter emissions regulations first, so a small European market with tighter controls doesn't define what we get. Given our less restrictive environment, tuning for more power shouldn't be a moon shot. Doing so would put the Skyactiv-X in with the optional 2.5-liter four-cylinder in the U.S. Mazda3, which makes 184 hp and 185 lb-ft. The real test will be gas mileage; the purpose of the Skyactiv-X is to provide those figures in company with 20 to 30 percent better fuel economy than the Skyactiv-G. Autoweek characterized Mazda CEO Akira Marumoto's comments on the engine as, "The Skyactiv-X variant will be positioned as the higher grade. It will have the driving dynamics of the 2.5-liter gasoline setup but the fuel economy of a 1.5-liter diesel." We have questions about this strategy, but we'll have to see how the pricing works out. Since the 2.5-liter serves as the base engine on the 2019 Mazda3, buyers can expect a meaningful premium to get into a Skyactiv-X. Right now, there's a $1,495 surcharge to go from the current 2.0-liter Mazda3 hatch to the 2.5-liter.

Road & Track to take Miata on million-mile march

Road & Track has taken on a Miata project. One hell of a project, if we're honest. You see, the Miata in question, a 1989 example in Mariner Blue, isn't a high-mileage Mazda that the publication intends to fix up, or make race-worthy, or try to flip or give away to a reader or something. No, it's a rather typical well-used NA, with a hefty 325,000 miles on the clock to-date that the staff plans on driving until the six-digit odo reads all zeros again. One million miles or bust (or both, most likely).
Procured for the bargain-basement price of $1,600, complete with seat covers that "really do look like muppet pelts" (according to Zach Bowman) and a bondo-filled love tap on the nose, the NA Miata actually looks like just the sort of fun-machine that a real driving enthusiast would pick up to get some cheap thrills in. The R&T team already has some interesting plans for the Miata, including a potential run up Pikes Peak and loaning it out to readers (or perhaps your author...). Click through to read all about it.