2017 Nissan Versa on 2040-cars

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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 GT-R and Jaguar F-Type meet for time trial battle [w/poll]

It seems that the Jaguar F-Type Coupe R is the performance coupe du jour. First, Motor Trend challenged it against a Porsche 911 on video to see how it fared. Now, Autocar in the UK is pitting the Jag against the latest iteration of the Nissan GT-R around a small course in a time trial battle.
On paper, it certainly looks like the F-Type Coupe is the clear winner. The two performance cars boast the same 542 horsepower (at least by UK specs), but the Jaguar does it with more torque, less weight and an eight-speed gearbox, compared to the six-speed in the GT-R. That seems like an automatic recipe for victory. However, the Nissan claims a faster sprint to 62 miles per hour and all-wheel drive. Nobody wants to watch a video of the new car running away into the sunset, and once the two of them make it to the track, the playing field appears much more level.
So which would you rather have? Keep in mind, that while the GT-R is cheaper than the F-Type Coupe R by a few thousand pounds in the UK, in the US a base R starts at $99,000, and the Nissan has a base price of $101,770. Scroll down to watch the video, and then make your choice in the poll, below.

Ever wonder how to really pronounce Japanese automaker names?

People tend to get very set in their ways when it comes to the pronunciation of words. Just look at the endless debates over whether or not to say the final 'e' in Porsche (which you should in terms of correct German enunciation). Or the argument about whether to follow the British convention and give the 'u' in Jaguar a special delivery or to say the 'ua' diphthong as more of a 'w' sound, as usually happens in the US.
This short video doesn't answer either of those automotive questions, but it does allow a native Japanese speaker to demonstrate the accepted pronunciations for several, major automakers from the country. One benefit is that it clears up the occasional debate over whether Nissan should be said with a long or short 'i' sound. Also, listen closely to how the female host says Mazda as Matsuda, the way it's actually said in the language. Even if this doesn't change the way you enunciate these brands, at least now you know the accurate way in Japanese.