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Infiniti's new VC-T changes the rules of small turbocharged engines

The upcoming Infiniti QX50 crossover does not get our pulse racing, no matter how shapely the QX Sport Inspiration concept that previews it may be. No midsize SUV does, to be fair. But it has something special under the hood – the world's first production variable-compression-ratio engine. That means the QX50's 2.0-liter turbo four, which makes 268 horsepower and 288 pound-feet of torque, will have up to 27 percent better fuel economy. Here's how it works. The trend of moving to smaller, turbocharged engines carries with it one big falsehood. Under low load when the turbo isn't needed, these engines are less efficient than an equivalent engine without a turbo because of the low compression ratio the turbo requires. That is, if you never need the extra power, you're wasting fuel. Turbocharged (and supercharged) engines use a lower compression ratio to prevent detonation. When you force extra air in a cylinder and mix it with fuel, it's more likely to prematurely go boom. Lowering the compression ratio prevents this problem, but it's less efficient. Infiniti's VC-T promises the best of both worlds, with a compression ratio that ranges from 8.0:1 for high-power turbo needs to a 14.0:1 ratio for fuel-sipping efficiency. At its heart the VC-T engine is a simple idea, but it's complicated to explain. Consider yourself warned. The photo below from Infiniti serves as a good visual overview. For the truly nerdy, this patent application covers the mechanical concept. Instead of having the pistons connected to the crankshaft, Infiniti's engine has a pivot arm with a connection on each end. One end connects to the piston, the other connects to a second lower shaft, which is controlled by an actuator arm. At any given time the engine's pistons move up and down according to the lobes on the crankshaft. But the actuator arm can change the angle of the pivot arm up and down. That is, the pistons still move in the same motion with the same stroke, but phase the entire stroke up or down. Move the pivot up and there's less room at the top, which means a higher compression ratio. Move the pivot down and the compression ratio goes down, too. As an added bonus, the lower shaft eliminates the need for counter-rotating balance shafts. Infiniti says this system works constantly and can vary the compression ratio to any number between 8:1 and 14:1. It also uses electronic variable valve timing on the intake valves to switch into Atkinson-cycle combustion for greater efficiency.

Nissan NV200 finds new work as ambulance, Gibson guitar repair truck

We live in a world now where not every police cruiser and taxi is a Ford Crown Victoria, not every executive car is a Lincoln Town Car and not every ambulance is based on a Ford Econoline van. Vehicles like the new Nissan NV200 are making inroads into the service, livery and emergency vehicle markets, and we've got a couple cases in point to share.
The first one is a fleet of 30 new ambulances based on the heavier-duty NV2500 chassis. They are entering the Mexican Red Cross fleet of emergency vehicles this year after performing well in pilot tests last year. The Mexican Red Cross says it receives 1,200,000 ambulance service requests per year, so the mettle of these new machines will be tested in a hurry.
The second example is less useful for life-saving, but may save a guitar from going to the scrap heap. Called the Gibson NV200 Mobile Repair & Restoration Van, it can take the services of an authorized Gibson rep anywhere they're needed to repair or restore an axe in need. The van features a whole aesthetic designed to evoke the classic Gibson look, with wood veneer and shades of brown and black used throughout. There's a guitar rack that holds four instruments, a sliding 56-inch long repair table, toolbox, genuine Gibson stools and a sound system by Gibson Pro Audio.

2024 Dodge Charger, the Apple Car and the 5 worst car brands | Autoblog Podcast #822

In this episode of the Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by News Editor Joel Stocksdale. They lead off with the 2024 Dodge Charger reveal, followed by various EV startup news including the reported death of the Apple Car; rumors of a tie-up between Fisker and Nissan; and when we'll finally see the Tesla Roadster. That's followed by rumors of sporty EVs from VW group possibly including an Audi TT and the five worst car brands according to Consumer Reports. Road Test Editor Zac Palmer pops in to discuss Formula 1 at Bahrain, and Migliore and Stocksdale wrap up the podcast with the cars they've been driving: the Toyota Prius, Kia EV9 and Infiniti QX50. Send us your questions for the Mailbag and Spend My Money at: Podcast@Autoblog.com. Autoblog Podcast #822 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 News 2024 Dodge Charger Reveal Apple Car reportedly dead Fisker and Nissan rumors Tesla Roadster production target Electric VW group sports coupes Five worst car brands Formula 1 at Bahrain What we've been driving 2024 Toyota Prius 2024 Kia EV9 (Road trip to Chicago) 2024 Infiniti QX50 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: