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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.

2019 Infiniti QX50 gets fancy-pants Autograph interior

The 2019 Infiniti QX50 has primarily garnered attention around car enthusiast circles for its variable compression engine. It's a marvel of engineering that uniquely changes its compression ratio to maximize power and fuel efficiency. It can also switch between Atkinson and regular combustion cycles, utilize multi-point or direct injection, it's turbocharged, and even features an electric motor that controls the variable compression ratio. Nifty stuff, but it seems likely that all that technobabble will make the average buyer of Infiniti's new compact SUV go crosseyed. It may not even be mentioned. "It has an engine? Great, let me see the inside." Well, dear car shopper who doesn't give a hoot about the greasy bits, have we got a bit of QX50 news for you. Infiniti has announced the QX50 Autograph package, a special $2,000 option with a seriously upgraded interior. Fancier materials and unique color schemes were selected, drawing inspiration from luxury beach resorts and being awfully similar to those found in the latest Pantone Fashion Color Trend Report. It's probably best to turn things over to the press release at this point. "Starting with warmer color tones, the rich chocolate brown replicates wood applications in the (beach) resort and the surrounding trees, followed by a creamy off-white representing the sand on a beach. The highlights of a cooler dark navy blue on the center console, reminiscent of ocean water, strike the proper balance between warm and cool, creating a comfortable, yet invigorating environment." Have you gone crosseyed? Well, now you know how it feels when describing the greasy bits to a non car person. Those cream, brown and blue bits are the Pantone colors, which, respectively, are known as "Coconut Milk," "Emperador" and "Sailor Blue." In the QX50, the Sailor Blue-esque blue is applied to the center console, dash and doors in Ultrasuede. The Emperadorish brown is on the steering wheel, leather-wrapped dash top and doors, outer portions of the seats and the lower door portions. Coconut Milk is indicative of the creamy dash color and the seat leather, which is diamond-quilted and contrast-stitched. There's also open-pore wood trim. Though I made light of this, the QX50 Autograph interior is actually quite striking. As Infiniti points out, consumers are starting to embrace color, which is worth celebrating. Give me Coconut Milk, Emperador and Sailor Blue over beige, grey and black any day.

Autoblog Podcast #391

Episode #391 of the Autoblog Podcast is here, and this week, Dan Roth, Mike Harley and Brandon Turkus talk about the appointment of Kumar Galhotra to run Lincoln, changes coming for Scion, the Dodge Charger SRT Hellcat, and which cars won't live into 2015. We also take a quick detour to talk about the Infiniti Q50 Eau Rouge prototype, which Mike Harley just came back from driving. 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 new rundown below with times for topics, and you can follow along down below with our Q&A. Thanks for listening! Autoblog Podcast #391: Topics: 2015 Infiniti Q50 Eau Rouge Prototype New boss at Lincoln Scion xB, iQ ending soon Dodge Charger SRT Hellcat Cars that won't live to 2015 In the Autoblog Garage: McLaren 650S Hyundai Genesis Hosts: Dan Roth, Michael Harley, Brandon Turkus Runtime: 01:42:06 Rundown: Intro and Garage - 00:00 Infiniti Q50 Eau Rouge - 30:05 Kumar Galhotra to Lincoln - 34:32 Scion Changes - 43:58 Dodge Charger Hellcat - 54:25 Discontinued Cars - 01:06:24 Q&A - 01:22:59 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 Hirings/Firings/Layoffs Podcasts Dodge Hyundai Infiniti Lincoln McLaren Scion Supercars mclaren 650s