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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.

Japanese automakers ramping production for renewed American sales

The 2011 earthquake and tsunami that struck Japan took quite the toll on the automotive industry in that nation. Not content to lean on that tragedy as excuse for slagging sales, the Japanese automakers are planning on a major production expansion in North America. The aim is to reclaim the market share lost from the Tsunami-based dip, and overcome a dollar/yen exchange rate that makes exporting to America unprofitable.
Following the Tsunami, Japanese automakers ramped up production in their North American facilities to compensate, but according to Automotive News, Nissan, Honda and others have all reported plans for still-further increased production in the year ahead. As part of this ramp-up, Mazda will open a facility in Salamnca, Mexico before March of 2014. Part of that increase in output is 50,000 units of a Toyota-badged compact car, which Mazda will produce.
Other Mexican production facilities opening include a Honda plant, which will open in Spring 2014 in Celaya, and a Nissan plant, set to open later this year in Aguascalientes. Nissan also said that it will need another plant in North America within the next five years. According to Nissan Boss Carlos Ghosn, the company aims to raise its stake in the US market from 8 percent to 10, and adding production will help achieve that goal. Even Mitsubishi is aiming to boost production at its Normal, Illinois plant. Production of the Outlander Sport is currently at 50,000, which Mitsubishi wants to raise to 70,000.

Mitsubishi and Renault-Nissan expand partnership, US will get new sedan

Mitsubishi and Renault-Nissan have just inked an alliance that might, hopefully, reverse the ailing fortunes of the Mitsubishi brand in the US market. The big chunk of news is that Mitsubishi will produce two Renualt-based models for sale in the US market, and that they'll be built at the Renault-Samsung factory in Busan, South Korea.
The plans call for a D-segment sedan to be followed by a C-segment offering. Based on the cars built at the Busan factory, that means Mitsubishi will be getting the SM5 and the SM3, a pair of handsome sedans that are based on Renault-Nissan's D and C platforms, respectively. These same platforms underpin a number of US market Nissans (not to mention a number of cars from Renault), namely the Pathfinder, Maxima, Quest and Murano for the D platform and the last-generation Rogue and Sentra for the C platform.
Besides the sedan production, Nissan and Mitsubishi will be expanding their joint-venture company, NMKV, which produces Kei cars for the Japanese market. A new, all-electric offering will be born from the partnership, likely based on a Kei car platform. The partnership between the three brands will also lead to increased sharing of technology, particularly relating to electric cars.