1993 Mazda Miata Mx-5 Only 62,000 Miles!!! New Wheels & Tires! New Paint Job!!! on 2040-cars

Auto blog

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.

Mazda patent shows rotary placement in complex AWD hybrid layout

If we were playing alt-powertrain Bingo, a recent Mazda patent application filed in Japan would be one or two letters from victory. What's exciting about the patent, discovered by Japanese outlet T's Media via Motor Trend, is that while it makes a case for an internal combustion engine of any configuration, one of the drawings showing a rotary engine. The wild bit is that the whole powertrain comprises the ICE, a transaxle, two tiny in-wheel electric motors turning the front wheels, a third electric motor in the driveline, a capacitor, a lithium-ion battery, and three inverters. Motor Trend parsed the mechanics, and the way it reads, Doc Brown couldn't have done a better job. The rotary engine at the front turns the rear wheels, but not directly. Instead of a flywheel on back of the engine, the drawing shows a 25-kW electric motor and an inverter, then a driveshaft running to the transaxle. Along the axis of the transmission tunnel in a normal car, between the inverter and the transaxle, lies a 3.5-kWh battery running at 48 volts. MT writes that the electric motor can add its output to the ICE output to drive the rear wheels, or the e-motor can turn the rear axle on its own. Up front, two inverters and a double-layer capacitor join the ICE in the engine bay. The capacitor and tiny hub motors in the front wheels run at 120 volts, a higher voltage than the rest of the electrical system, so that the small in-wheel motors can generate the same torque as a larger motor running at a lower voltage. The AWD system acts on-demand. Given the signal, the capacitors discharge their energy to the wheel motors, and recover energy from braking. When the capacitors are at full charge, they send excess regen energy to the lithium-ion battery; conversely, the battery can recharge the capacitors when they're low and the front hub motors need power. The patent explains that the ICE works with the rear e-motor to drive the rear wheels at low speeds, the front motors called on to "generate an output only when a large output is required in the high vehicle speed range." The rather complicated system is focused on providing the benefits of a hybrid system and all-wheel drive, but at lower weight than one would expect. A rotary serves due to its compactness, but one of the drawings shows an engine with a V layout. Hub motors get dinged for adding unsprung weight, hence the small motors here.

2018 Mazda MX-5 Miata and MX-5 Miata RF pricing announced

At Chicago, Mazda has announced official 2018 pricing for the MX-5 Miata, both soft-top and RF. The trick-roofed RF version, or Retractable Fastback, has a coupe-like power hardtop that opens up into a targa. It's only natural that there are MX-5 models on display at the Chicago Auto Show, as 29 years earlier the original Miata was unveiled there. All ND generation cars sold in the U.S. have the 155-horsepower Skyactiv-G engine with a choice of six-speed manual or six-speed automatic. While the canvas-topped 2018 MX-5 starts from $25,295 as a manual Sport, the RF bypasses the Sport spec and starts directly from the Club, which for the RF means a $31,910 starting price, or $355 more than for 2017; the soft-top 2018 Club costs $29,555 in comparison, or a measly $120 hike. The manual Club has a limited slip differential, a front strut brace and Bilstein suspension. Similarly to the soft-top car, the RF also gets a Brembo/BBS brake/wheel/appearance package that hikes the price to $35,680 — and that is only available with manual transmission. That package costs $32,925 for the soft-top, which has also a $700 Recaro sport seating option for the aforementioned Brembo/BBS package, but that is unavailable for the RF. Grand Touring comes with automatic climate control, heated leather seats and adaptive lighting, at a price of $30,195 for the soft top and $32,750 for the RF. Add new-for-2018 Nappa leather for the Grand Touring for $300. At launch in the 2017 model year, the RF Grand Touring was priced $3,000 dearer than a comparable soft-top version, but that difference has now shrunk by $500. Related Video: Featured Gallery 2018 Mazda MX-5 RF: Chicago 2018 View 11 Photos Image Credit: Copyright 2018 Drew Phillips / Autoblog.com Auto News Chicago Auto Show Mazda Convertible Coupe Performance 2018 Chicago Auto Show