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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.

Datsun debuts new seven-seat Go+ in Indonesia [w/video]

The Datsun name may have long since been replaced by Nissan, but the old brand is making a comeback - in certain markets, at least. Nissan relaunched the Datsun brand in July as its new budget brand for developing markets with the debut of the Go hatchback, and has now followed up with the addition of the larger Go+.
Set to be built in Indonesia at Nissan's plant in Purwakarta, the Go+ debuts today in the capital of Jakarta as the second model in the new Datsun lineup. The seven-passenger minivan features flexible seating in a compact form 13 feet long, powered by an unspecified 1.2-liter engine mated to a five-speed manual transmission.
Nissan isn't saying much else about the model, but hopes the new Datsun twins will account for half of its sales in Indonesia within three years. The low price target for both models - set to come in at less than 100 million rupiah ($8,700) - ought to help it get there. The lineup is then scheduled to reach other markets, starting with India, Russia and South Africa next year.

'Charge lock' on Nissan Leaf doesn't actually prevent cable theft

Is it a feature or a bug? According to AutoblogGreen reader Francois Viau, the locking mechanism that holds the 110V trickle charge cable to his Nissan Leaf is too weak, and that's a problem. That's because while he thought the cable was locked to his car during a charge session at work, someone stole the cable, and it cost him $2,200 to replace it (in Canadian dollars, from the Nissan dealer). To see just how easy it is to unlock the mechanism, Viau had a "small assistant" jimmy it open with a plastic comb on video (watch it below). "The charge lock feature on Nissan Leaf is not intended to prevent theft of the charging cordset." – Brian Brockman We wondered if this was a common problem and, through the magic of Facebook, we had AutoblogGreen reader Phil Tipper try it out on his 2013 SL Leaf. He said he used an insulated handle flat screwdriver and was not able to defeat the lock. "I admit that I didn't want to force the mechanism for fear of breaking it, it didn't look like that kid used much force at all," he said. "Maybe this guy's mechanism was damaged in the theft and now it's very easy to trip the lock out of the way." Fifty percent of a sample size of two isn't a reliable metric, but if you're worried about locking your cable in place, you can see some of Viau's anti-theft solutions here (in French, with pictures). Turns out, though, that the white plastic bit that prevents the cable handle from working during a charge isn't really an anti-theft device. Brian Brockman, senior manager of corporate communications for Nissan North America, told AutoblogGreen that, "The charge lock feature on Nissan Leaf is not intended to prevent theft of the charging cordset. It is designed to discourage someone from unplugging the vehicle while a charging session is in progress. The trickle charge cable features a small hole in the release button to allow the owner to insert a lock to reduce the chance of theft." So, now you know. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.