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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.

10 of 18 midsize SUVs earn 'good' IIHS side impact safety rating

It's not terribly surprising that midsize SUVs earned better safety ratings than small SUVs in the latest side-impact tests performed by the Insurance Institute for Highway Safety (IIHS). Just how much better they scored, on the other hand, certainly raises an eyebrow. Ten out of 18 midsize SUVs earned the highest rating of 'good' in the stringent new test, altered for vehicles starting with the 2020 model year with a heavier barrier (4,200 pounds) that moves at a higher speed (37 miles per hour) and is fitted with a hard honeycomb frontal structure. By way of contrast, just one out of of 20 small SUVs earned a 'good' score.  SUVs that receiving 'good' scores were the Ford Explorer, Infiniti QX60, Lincoln Aviator, Mazda CX-9, Nissan Pathfinder, Subaru Ascent, Toyota Highlander, Volkswagen Atlas, Volkswagen Atlas Cross Sport and Volkswagen ID.4. For EV fans, it's worth noting the ID.4 was the only electric vehicle included in the test. The Buick Enclave and Chevrolet Traverse scraped away with 'acceptable' ratings while the Honda Passport, Honda Pilot, Hyundai Palisade, Jeep Wrangler 4-door, Kia Telluride and Nissan Murano were deemed merely 'marginal' in the tough new test. Only two models — the Mazda CX-9 and Volkswagen ID.4 — earned a "Good" rating in every test category.  Interestingly, the Jeep Wrangler would have scored a 'good' rating if it were equipped with side airbags for the rear seating positions. It would likely be an engineering challenge to equip its removable top and/or doors with airbags, but the lack of that safety feature allowed the head of the rear passenger dummy to hit the vertical support of the top. Otherwise, the Wrangler scored good ratings across the board. The new Ford Bronco, which makes more allowances for side-impact safety, has not yet been tested.  The popular Hyundai Palisade and Kia Telluride SUVs stand out in the test with 'poor' ratings for driver pelvis injuries. The Nissan Murano, a vehicle last redesigned for the 2015 model year, was the only vehicle tested that received a 'poor' rating for its structure and safety cage. Videos of the tests of 12 of these 18 SUVs can be found on the IIHS' YouTube page. Related video: Green Buick Chevrolet Ford Honda Hyundai Infiniti Jeep Kia Mazda Nissan Subaru Toyota Volkswagen Safety Crossover SUV IIHS Insurance Institute for Highway Safety

2016 Kia Optima builds on third-gen car's sense of style, efficiency

When Hyundai launched the sixth-generation Sonata in 2009, it gave the world its first real taste of how good a Korean car could be. When Kia launched the redesigned Optima a year later, though, it showed the world just how good a Korean car could look. The handsome design of third-generation car has translated wonderfully to its fourth generation. The attractive sheet metal is evolutionary, rather than revolutionary, building on the looks of the previous car, with Kia's trademark grille treatment stretched wide, and better integrated with the headlights. Vertical foglight surrounds and an independent lower grille, meanwhile, make for a more aggressive fascia. LED taillights, an integrated diffuser and a pair of meaty oval exhausts are the highlights in back. Once again, the links to the current car are quite clear. The new Optima should boast some improvements to the current car's technology, as well. A six-speaker stereo is standard, although audiophiles will flock to the optional 14-speaker Infinity unit. Connectivity, being what it is, was also addressed, with Kia offering a new version of the company's UVO infotainment system. Running on an eight-inch touchscreen, the Optima's latest infotainment system integrates neatly with both Android Lollipop and iOS 8. Under hood, Kia will continue to offer a standard, naturally aspirated 2.4-liter four-cylinder, as well as an optional 2.0-liter, turbocharged four-cylinder. Power for both engines is estimated to be down compared to the current car, with the 2.4 dropping from 192 horsepower and 181 pound-feet of torque to 185 hp and 178 lb-ft, and the 2.0T losing 27 of its 274 hp and nine of its 269 lb-ft. Kia is claiming that both engines have been retuned for fuel economy, although it wasn't able to provide any figures to back up that argument. On top of the 2.4 and 2.0T, Kia will also offer a 1.6-liter, turbocharged four-cylinder, complete with the company's first seven-speed dual-clutch transmission (the previous two engines are mated to six-speed autoboxes). The 1.6, which Hyundai/Kia fans will know from the Veloster Turbo and Forte range, produces 178 hp in the Optima, which is paired with 195 lb-ft of torque. Have a look at the images of the all-new Optima, and then scroll below for the official press release.