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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's quickest cruiser | 2018 Kia Stinger GT First Drive

The 2018 Kia Stinger is a provocatively named, turbocharged fastback sedan that arrives in America in a few months, and we've just been given a great snapshot of what to expect at Germany's notorious Nurburgring circuit. While the very final tuning is under way, the late-stage prototypes we drove are "99 percent there," says Albert Biermann, former BMW M chief engineer, now head of engineering for the Hyundai Group. Despite our first experience with the Stinger being at a famously technical track, Biermann and others stressed that the Stinger is very much a grand tourer. To be clear, just about no one will track the Stinger. So why then do we find ourselves in the Eifel region of Western Germany? Because Korea's new sports sedan signals a dramatic brand shift for Kia, and the Stinger GT is the first to reflect a new, more performance-oriented direction. Kia at the Nurburgring? If you want to make a point, this is one way to do it. Arriving this fall, the Stinger will have three powertrain options on offer globally, but only two gas-fueled turbocharged engines for North America. The entry-level Stinger 2.0T is rated at 255 hp and 260 lb-ft, but our impressions are based on the GT, motivated by Kia's brawnier 3.3-liter twin-turbo, good for 365 hp and 376 lb-ft. Peak power arrives at 6,000 rpm, and peak torque between 1,300 and 4,500 rpm. All engines — including the not-for-America 2.2-liter diesel — are mated to an eight-speed automatic transmission with shift paddles. Both rear-wheel drive and AWD configurations will be available. While the automaker has made some sporty-looking, attractive sedans such as the Optima Turbo, and Cadenza, it wants to "make them drive like they look," says Biermann. Throw the 'Ring's 73 corners, 17 percent incline, and 11 percent decline — all at speed — and you'll learn quite a bit about Kia's newest, very quickly. So how does the Stinger drive? If this was an exercise to understand the touring aspects of the car, it was lost on us. Lap one of our lead-follow drive on the 'Ring wasted no time in demonstrating this new, more dynamic direction. The pace car in front smashed the throttle and entered the 'Ring at speed, banking hard-left on the first turn. I followed suit, mashing the gas, flying into the first turn, tires screeching, the rear sliding out just a bit despite the GT's AWD. Immediately I'm surprised by the acceleration.

Autoblog Podcast #398

Episode #398 of the Autoblog Podcast is here, and this week, Dan Roth, Brandon Turkus, and Michael Harley talk about the 2015 Ford Mustang, the 2015 Toyota Camry, and the Congressional grilling NHTSA received last week. We start with what's in the garage and finish up with some of your questions, and for those of you who hung with us live on our UStream channel, thanks for taking the time. Check out the rundown below with times for topics, and you can follow along down below with our Q&A. Thanks for listening! Autoblog Podcast #398: Topics: 2015 Ford Mustang 2015 Toyota Camry NHTSA under Congressional fire In The Autoblog Garage: 2014 Lexus ES 300h 2014 Lexus GS 350 F-Sport 2015 Kia K900 Hosts: Dan Roth, Michael Harley, Brandon Turkus Runtime: 01:36:56 Rundown: Intro and Garage - 00:00 2015 Ford Mustang - 28:58 2015 Toyota Camry - 42:41 NHTSA - 57:55 Q&A - 01:17:15 Get the podcast: [UStream] Listen live on Mondays at 10 PM Eastern at UStream [iTunes] Subscribe to the Autoblog Podcast in iTunes [RSS] Add the Autoblog Podcast feed to your RSS aggregator [MP3] Download the MP3 directly Feedback: Email: Podcast at Autoblog dot com Review the show in iTunes Government/Legal Podcasts Ford Kia Lexus Toyota