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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.

Did Mazda designer Derek Jenkins leave to head up a 'Stealth Project?'

Not long after Derek Jenkins officially gave the 2016 MX-5 Miata to the buying world, he's left the Mazda building. Jalopnik reported that the head of design for Mazda North America changed the current job description on his LinkedIn profile to "Stealth Project." Mazda backed up the discovery with this reply to Jalop's inquiry: Derek left Mazda last Friday. He left on great terms in order to work on a new endeavor. We wish him the best of luck. He will be missed, but we are sure that he will do great things in the next chapter of his career. That "last Friday" would be July 17. Emphasizing the "stealth" bit in his new position, as far as we can tell, Jenkins still hasn't publicly answered any question about what he's doing. Every automaker has secrets, but traditional automakers usually make a hubbub about hiring big-name designers, especially one with Jenkins' resume. For his new employer to go all Ghost Recon with all information, well that's the kind of mystery this summer needs. The obvious culprit would be a certain fruit-named company in a certain Cupertino, CA office park. If that ends up being the case, Jenkins would be the second chief designer at Mazda NA to go electric: he replaced Franz von Holzhausen in the position after von Holzhausen went to Tesla. Various other Apple Project Titan hires have made the news, though. For all we know, Jenkins' project might not be automotive. So let's just go ahead and cue the speculation. We're looking forward to whatever he's got coming, and to whoever gets nominated to keep the full head of Zoom-Zoom going at Mazda NA.

NHTSA releases updated Takata airbag recalled cars list, but it still has errors

Unfortunately, the government's list still contains errors.
The National Highway Traffic Safety Administration has issued an updated list of vehicle models that it's urging owners to repair under the mushrooming Takata airbag inflator recall. The latest version adds vehicles from new automakers like Subaru and Ford that are missing from the original announcement, and it also removes erroneous entries from General Motors, leaving only the 2005 Saab 9-2X (a reskinned Subaru WRX), and the 2003-2005 Pontiac Vibe, a joint project with Toyota.