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Hyundai CVVD engine brings another dimension to valve timing

A new technology from Hyundai Motor Group places another marker on the march to more efficient internal combustion engines. Called Continuously Variable Valve Duration, the innovation permits two options for how long the intake valves remain open during the combustion cycle. The feature adds a third take on valve chicanery, atop variable valve timing that changes when valves open, and variable valve lift that changes how far valves open. Hyundai says the feature returns a 4% improvement in performance, a 5% increase in fuel economy, and lowers emissions by 12%. Hyundai applied for two patents on the valvetrain process in South Korea in 2011 and again in 2015. The altered valve duration in this latest iteration is made possible by two movable arms inside the camshaft. Each arm is anchored at its base to a pin at the center of the camshaft, while the end of each arm extends toward the edge of the camshaft. Changing the position of the pin in the center of the camshaft changes the angle of the arms relative to one another, which moves the camshaft along its mounting rod. Voila, a new intake cam profile that either lengthens or shortens valve overlap.   During low-speed spells at low load, CVVD opens the intake valve from the middle to the end of compression stroke. The weaker detonation isn't a factor at low load, and the reduced friction during compression improves fuel economy. During heavy engine loads, the intake valve closes at the beginning of the compression stroke to maximize the amount of air mixed for detonation, boosting torque. Four additional features enhance the benefits of CVVD. A more powerful direct injection system increases fuel spray pressure from 250 bar to 350 bar. Hyundai doesn't go into details on its Integrated Thermal Management System, but says the ITMS "quickly heats or cools the engine to the optimal temperature." Low-friction components lower overall engine friction by 34 percent. And a low-pressure exhaust gas recirculation layout diverts low-pressure exhaust gas from the traditional EGR route to the turbocharger compressor under high load for better fuel efficiency.   The first engine to boast the new tech is the Smartstream G1.6 T-GDi four-cylinder, which produces 180 horsepower and 195 pound-feet of torque. It will appear in the 2020 Hyundai Sonata Turbo going on sale in South Korea later this year.

Autoblog Subcompact Crossover Comparison | Honda HR-V, Hyundai Kona, Jeep Renegade, Kia Soul

LAKE LEELANAU, Mich. — Consumers, and consequently automakers, are increasingly moving away from sedans and into crossovers as drivers seek more space and utility on roads heavily populated by larger and taller vehicles. While the various crossover segments are dominated by bigger, more expensive, family-oriented vehicles, those at the very bottom of the size and price ladder are a little different. The diverse selection of subcompact crossovers are targeting an equally diverse selection of buyers who need something sized to fit into their urban and suburban driving lives — not to mention their budgets. Some sort of active, outdoorsy lifestyle is almost always intended. Enough of these small crossovers have popped up that we thought it high time to pick some popular competitors — the Honda HR-V, Hyundai Kona, Jeep Renegade and Kia Soul — and pit them against one another in a four-way comparison test. We tried to spec them out as closely as we could in terms of price, with the Jeep standing out as the sole outlier with a price over $30,000. Following in the footsteps of our midsize pickup comparison test, we drove up to Michigan's pinky, where weÂ’d eat, sleep, and breathe these four crossovers to figure out which came out on top based on our 100-point ranking of objective and subjective metrics. Autoblog Subcompact Crossover Comparison View 36 Photos Certainly, there are more choices available than this four (a Subaru Crosstrek in particular was not available at the time of our test), but we think the HR-V, Kona, Renegade and Soul are a representatively diverse collection of popular choices. Without further ado, here are the results of our test, starting with fourth place. Related: Autoblog's Midsize Pickup Truck Comparison Test Fourth place: 2019 Honda HR-V AWD Touring – 72.2 points The Honda HR-V is the second oldest vehicle in this comparative set behind the Jeep Renegade. We first tested it in April 2015. More so than its Jeep counterpart, the Honda feels its age. ItÂ’s dated inside and out, the infotainment tech is in dire need of an update (yes, even though it was actually recently updated), and the CVT feels at least a generation behind most others currently available. And that powertrain is the biggest issue that held the HR-V back from a better score in our comparison. Of the four vehicles, it has the least power, which makes the CVT even more of a nuisance.

Weekly Recap: Mazda's rotary revival ignites Tokyo Motor Show

Forty-eight years ago Mazda pioneered rotary engines in the Cosmo Sport. Mazda then honed the technology, won with it on the racetrack, and made it one of its signature features. If you're an enthusiast, rotary was a reason you like Mazda. It's a great part of the company's past. But until this week, that's exactly what we thought it was. History. That all changed with the reveal of the RX-Vision concept at the Tokyo Motor Show, which reignited the passions of the Mazda faithful. Suddenly, rotary was no longer a relic. The rotary concept shown in Japan was a front-engine, rear-wheel-drive sports car wrapped in the company's latest Kodo design language. It's powered by a Skyactiv-R unit (R for rotary), though specs were not disclosed. Mass production is "currently on hold," Mazda said, maintaining it never stopped development of rotary technology, even after the demise of the RX-8. Beyond that, we know nothing, other than the optimistic statement Mazda offered that: the "RX-Vision represents a vision of the future that Mazda hopes to one day make into reality." Put simply: we agree. OTHER NEWS & NOTES: Subaru previews next-gen Impreza While the Mazda concept was the headliner from Tokyo, Subaru's Impreza design study also stood out. The five-door concept is a signpost for the look of next-generation Impreza. It blends sportiness with functionality, and it's wrapped in a striking shade of 'high-luminance silver.' The fenders are flared to signal Subaru's all-wheel-drive capability, and the front has futuristic headlights that look like something from an Audi E-Tron concept. While most of this will be toned down in production, the concept suggests an elevated style for the Impreza, which is due as a 2017 model. Porsche adds potent GTS model to 2017 Macan line Porsche is giving the Macan crossover the GTS treatment, which will start at $68,195 when it goes on sale in March. GTS translates to more power, a sportier suspension, and interior and exterior design cues that sharpen the looks and reflexes of one of the most athletic SUVs on the market. Porsche recalibrated the 3.0-liter twin-turbo V6 from the Macan S to make 360 hp and 369 lb-ft, (up from 340 hp and 339 lb-ft in the S). It teams with a seven-speed PDK gearbox and all-wheel drive. An air suspension is standard. The body features a slew of black accents, and the standard 20-inch RS Spyder wheels are done up in a shade of satin black. The cabin gets leather, Alcantara, and GTS logos.