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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.

Why this could be the perfect time for Apple to make a car play

While the automotive and technology worlds have been pouring billions into autonomous vehicles (AVs) and preparing to bring them to market soon as shared robo-taxis, Apple has mostly sat on the sidelines. Of course, Apple is the last company to ever make its intentions known, and the super-secret tech cult giant hasn't been totally out of the AV game based on the clues that have slipped out of its Cupertino, Calif., citadel over the past few years. Related: Apple self-driving cars are real — one was just in an accident News first broke in 2015 that it had assembled an automotive development team, in part by poaching high-profile talent from car companies, to work on a top-secret self-driving vehicle project code-named Titan. (Thank you very much, Nissan.) Apple also subsequently broke cover by making inquiries into using a Northern California AV testing facility and receiving a permit to test AVs on public roads in California. But then as the AV race started to heat up in the last few years, Apple reportedly began scaling back its car activities by downsizing team Titan. More recently, Apple's car project has shown signs of life with the hiring a high-level engineer away from Waymo and luring one Tesla's top engineers and a former employee back to Apple. It also inked a deal with Volkswagen to provide a technology platform and software to convert the automaker's new T6 Transporter vans into autonomous shuttles for employees at tech company's new campus. That is a far cry from giving rides to Wal-Mart shoppers, like Waymo is doing as part of its AV testing in Phoenix. But this could be the perfect time for Apple to enter the AV market now that ride-sharing is reaching critical mass and automakers and others are planning to deploy fleets of robo-taxis. Apple could easily establish a niche as a high-end ride-sharing service – and charge a premium – given its cult-like brand loyalty and design savvy. The growth of car subscription models could also play in Apple's favor since is already has many people hooked on paying for phones in monthly installments – and eager to upgrade when a new and better model becomes available. To achieve this, some believe Apple will fulfill co-founder and CEO Steve Job's dream of building a car. And as the world's first and only $1 trillion company it's sitting on a mountain of cash that certainly gives it the means. But other tech darlings like Tesla and Google have discovered how difficult it can be to build cars at scale.

Auto News Recap For 5.13.16 | Autoblog Minute

Senior Editor Greg Migliore recaps the week in automotive news, including a look at Hyperloop One's desert propulsion test, Chrysler 300 rumors, and Nissan's purchase of Mitsubishi. Chrysler Mitsubishi Nissan Autoblog Minute Videos Original Video hyperloop