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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.

Kia calls in 87k Fortes over fan fire issue

An electrical issue on the 2014 Forte has prompted Kia and the National Highway Traffic Safety Administration to issue a recall for 86,880 vehicles across America. The problem stems from the resistor for the cooling fan that the Korean automaker has found could overheat and melt, which would increase the risk of a fire. And fires in an automobile, needless to say, are not a good thing – unless they're occurring inside a combustion chamber. The issue affects units manufactured between December 5, 2012, and April 17, 2014. Owners of said Fortes can expect to hear from Kia to arrange to bring their vehicles in to their local dealer to have the multi-fuse unit replaced – and, for those manufactured between December 5, 2012, and January 27, 2014, the cooling fan as well. Vehicles equipped with the 1.8-liter engine will also have their ECUs reflashed while they're at it. RECALL Subject : Cooling Fan Resistor May Melt Report Receipt Date: JAN 16, 2015 NHTSA Campaign Number: 15V015000 Component(s): ELECTRICAL SYSTEM Potential Number of Units Affected: 86,880 Manufacturer: Kia Motors America SUMMARY: Kia Motors America (Kia) is recalling certain model year 2014 Kia Forte vehicles manufactured December 5, 2012, to April 17, 2014. In the affected vehicles, the cooling fan resistor may overheat and melt. CONSEQUENCE: If the cooling fan resistor overheats and melts, there is an increased risk of a vehicle fire. REMEDY: Kia will notify owners, and for vehicles produced from December 5, 2012 to January 27, 2014, dealers will replace the cooling fan resistor and multi-fuse unit. For vehicles produced from January 28, 2014 to April 17, 2014, dealers will replace the multi-fuse unit only. Owners of vehicles with a 1.8L engine will also have the engine control unit software updated. The recall is expected to begin February 24, 2015. Owners may contact Kia customer service at 1-800-333-4542. Kia's number for this recall is SC113. NOTES: Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.safercar.gov.

Aston Martin DBX and the craziest car redesigns | Autoblog Podcast #716

In this episode of the Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Senior Editor James Riswick. They chat about slumming it in the Aston Martin DBX, the brand's first SUV, which they didn't have terribly high expectations for yet utterly blew them away. Riswick in particular notes it's one of the best cars he's ever driven, describing it as a family GT car. They then switch to a very different family vehicle: the 2022 Kia Carnival, and the unique second-row seating arrangement we've dubbed the "Captain Kirk chair." Greg has also been driving the Chevrolet Tahoe Premier. They also chat about two of Riswick's recent features: the 20 craziest car redesigns of the past 20 years and the best cars for snow.  Autoblog Podcast #716 Get The Podcast Apple Podcasts – Subscribe to the Autoblog Podcast in iTunes Spotify – Subscribe to the Autoblog Podcast on Spotify RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Rundown Cars we're driving Aston Martin DBX 2022 Kia Carnival 2022 Chevy Tahoe Features 20 craziest car redesigns of the last 20 years Best cars for snow Feedback Email – Podcast@Autoblog.com Review the show on Apple Podcasts Autoblog is now live on your smart speakers and voice assistants with the audio Autoblog Daily Digest. Say “Hey Google, play the news from Autoblog” or "Alexa, open Autoblog" to get your favorite car website in audio form every day. A narrator will take you through the biggest stories or break down one of our comprehensive test drives. Related Video: 2022 Chevy Tahoe Premier Walkaround | Autoblog Short Cuts