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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.

Will GM leave Europe? | Autoblog Podcast #504

On this week's podcast, Greg Migliore joins David Gluckman to discuss the possibility of GM selling off its Opel division to France's PSA (also known as Peugeot and Citroen). They also recap what they've all been driving lately, and the episode wraps up with Spend My Money buying advice to help you, our dear listeners. And, thankfully, no dad jokes this week. The rundown is below. Remember, if you have a car-related question you'd like us to answer or you want buying advice of your very own, send a message or a voice memo to podcast at autoblog dot com. (If you record audio of a question with your phone and get it to us, you could hear your very own voice on the podcast. Neat, right?) And if you have other questions or comments, please send those too. Autoblog Podcast #504 Topics and stories we mention Dodge Durango Infiniti QX30 GM's version of Brexit could mean selling Opel Used cars! Rundown Intro - 00:00 What we're driving - 01:36 GM and Opel - 25:47 Spend My Money - 39:00 Total Duration: 54:46 Get The Podcast 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 on iTunes Podcasts Dodge GM Infiniti infiniti qx30

2014 Infiniti Q50 sees 3,650 pre-sales ahead of Aug. 5 debut

Infiniti's answer to the hot new sports sedans from BMW, Cadillac and Lexus is creeping closer and closer to its August 5 arrival in dealerships. And while we yet can't pass judgment on the Infiniti Q50 - formerly known as G37 - 3,650 Americans are apparently ready to, as they've already raised their hands for the 2014 model.
In a pre-sale program announced at the 2013 New York International Auto Show, Infiniti gave buyers until June 30 to raise their hand for the new model. "The Infiniti Q50 pre-sale exceeded all expectations, becoming the most successful such program in Infiniti history," according to Infiniti's American Vice President Ben Poore.
A lot is expected of the Q50, available in both rear- and all-wheel-drive and with an optional hybrid powertrain. With 328 horsepower from its 3.7-liter V6 engine, Infiniti is making sure the new car packs a big punch relative to the competition. Meanwhile, the Q50 Hybrid offers fuel-sippers 360 ponies and up to 36 miles per gallon.