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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 Nissan's Cummins deal upset Ram's marketing mojo? [w/poll]

Ram has used Cummins engines in its heavy duty trucks since 1989, and it is the only pickup truck brand to use products from the Indiana-based engine maker. With the announcement that the next Nissan Titan will also use a Cummins powerplant, and a Nissan spokesman having already said "We will definitely leverage the Cummins brand name," a piece in Automotive News wonders whether the deal will affect the way Ram markets its tie-up with Cummins.
The question really is, how intense is this competition? While it is the first time that trucks from two different brands have used Cummins engines, they'll be two different engines in two different kinds of trucks; Nissan is going to put a 5.0-liter turbodiesel in a non-heavy-duty Titan, Ram only uses its 6.7-liter, inline six-cylinder turbodiesel in heavy-duty offerings. The diesel that Ram will offer in its light-duty, half-ton 1500 is a 3.0-liter V6 EcoDiesel with 240 horsepower and 420 pound-feet of torque - compared to about 300 hp and 550 lb-ft expected from the Titan's Cummins - and its marketing so far has focused on the fuel economy gains.
If Nissan was going to prove its commitment to the segment, it had to do something compelling. If we're talking about sales competition between Ram and Nissan, Ram has sold 201,633 trucks as of July this year, up 24.2 percent, 31,314 of those sales coming last month; Nissan has sold 10,020 Titans through the end of July, down 21.1 percent, and just 1,168 in July itself. Nissan's new truck boss - who hopped there from Ram - said that buyers have asked for a powerful turbodiesel in something other than a heavy duty pickup, and from what we've read on various comment boards, the pickup truck crowd is excited about Nissan's move.

Mercedes to build CLA at Nissan plant in Mexico [w/poll]

Volkswagen may have paved the way for American customers to get used to the idea of German cars produced in Mexico, but it won't be the only one for long. BMW is said to be considering production of the 1 Series, 3 Series and Mini south of the border, Audi is working on its own factory in San Jose Chiapa, and now Mercedes-Benz is reported to be following suit as well. Only instead of building its own plant, Daimler is tipped to use a Nissan factory in Aguascalientes.
According to a report in Manager Magazin recently cited by Automotive News Europe, that's where Mercedes is considering building the GLA, CLA and another A-Class sedan. Just what the point would be of another sedan based on the A-Class in addition to the CLA, we're not sure, but if Benz can produce the larger CLS in addition to the E-Class and S-Class sedans, we suppose there'd be room for an A-Class sedan alongside the CLA as well.
We're still waiting on confirmation and comment from Mercedes on the prospect, but one way or another, the increase in Mexican production of German automobiles seems to be a foregone conclusion.