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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 ZEOD RC completes 24 laps at Le Mans

Well, that's a nice start. Nissan says a test version of its ZEOD RC racecar has completed its first 24 laps at Le Mans in France. And, aside from two "small technical issues," things went swimmingly. The ZEOD (which stands for "zero emissions on demand") RC pairs a 1.5-liter, three-cylinder engine with a couple of electric motors and includes regenerative braking. The Japanese automaker first started testing the vehicle last fall. The first ZEOD prototype was unveiled at Le Mans last summer. Driven by Wolfgang Reip and Tommy Erdos, the test-version ZEOD suffered from a broken fuel pump and faulty exhaust, but still completed "large sections" of the circuit on electric power alone, so Nissan is gonna call the test run a success. The goal, of course, is to complete a single, 8.5-mile lap at Le Mans purely on electric power. Nissan will test the real version of the ZEOD this week in the UK. Satoshi Motoyama and Lucas Ordonez will drive with Reip at the actual Le Mans race. Check out Nissan's press release below, and take a look (you can cringe a bit if you want) at a really cool crash-test video of the car from last month here. Nissan ZEOD RC on track at Le Mans for the first time SILVERSTONE, UK & LE MANS, FRANCE – The Nissan ZEOD RC completed its first 24 laps of Circuit de la Sarthe with GT Academy winner Wolfgang Reip and two-time Le Mans P2 winner Tommy Erdos at the wheel. While the car was delayed with two small technical issues – a broken fuel pump issue and a broken exhaust – today's test was an important step in the development of the car that aims to complete an entire lap of Le Mans on pure electric power. "Today has been a very important step in the development of the car and what we have achieved is actually quite remarkable," said NISMO's Global Head of Brand, Marketing & Sales, Darren Cox. "We knew we were tackling a huge challenge with the goal of building a car that could complete an entire 8.5 mile lap of Le Mans on nothing but electric power. We have certainly discovered why nobody has tackled it previously. "We completed large sections of the circuit today on EV power and learned a great deal," Cox continued. "Today was about testing the systems and ensuring the transition from electric to internal combustion power was seamless. Testing at other venues is extremely valuable but there is no substitute to running here at Le Mans.

Chip shortage will hit Nissan, Suzuki and Mitsubishi in June

TOKYO — A global chip shortage is forcing Nissan and Suzuki to temporarily halt production at some plants in June, sources with direct knowledge of the plans told Reuters on Friday. Nissan will idle its factory in Kyushu, southern Japan, for three days on June 24, 25 and 28, while making production adjustments during the month at its Tochigi and Oppama plants in Japan, three sources said. Nissan will also temporarily halt production of some of its models at its Mexico plant, they said, declining to be identified because the plan is not public. "A global shortage of semiconductors has affected parts procurement in the auto sector. Due to the shortage, Nissan is adjusting production and taking necessary actions to ensure recovery," a Nissan spokeswoman said. Suzuki will idle its three plants in Shizuoka prefecture from three to nine days, two sources said, also declining to be identified because the plan is not public. The plan "has not been confirmed," a Suzuki spokesman said, explaining that while the carmaker gave its provisional production plan to auto part makers, it is still making adjustments to minimize the impact of the chip shortage. Elsewhere, Mitsubishi will reduce production by 30,000 vehicles in total in June at five plants in Japan, Thailand and Indonesia, a spokeswoman said, adding that the impact has already been factored into its earnings outlook for the current fiscal year. Related video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. Plants/Manufacturing Mitsubishi Nissan Suzuki