2014 Nissan Juke Nismo Rs 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.

2013 Nissan Juke Nismo is the runabout we've always wanted

The 2013 Nissan Juke Nismo has officially bowed at the 2013 Chicago Auto Show. Wearing a full body kit that serves up 37-percent more downforce than the standard front and rear fascias, the tuned hatchback also comes equipped with larger 18-inch wheels and a lowered suspension. Up front, LED daytime running lights join the festivities as well as contrasting side-view mirror covers and wider fender flares. Inside, buyers can expect to find a new sports steering wheel clad in Alcantara, as well as a set of Nismo seats stitched with red accents.
Nismo also cranked up the power on the Juke's turbocharged direct-injection 1.6-liter four-cylinder engine. The Juke Nismo delivers 197 horsepower and 184 pound-feet of torque, compared to the 188 hp and 177 lb-ft available in stock configuration. Buyers can have the engine with either a six-speed manual transmission or CVT gearbox, and the Juke Nismo can also be had with either all-wheel drive or front-wheel drive. Check out the full press release below for more information.

Nissan Murano CrossCabriolet being phased out, no replacement planned

Over the years, I've been given many nicknames - a few of them have even been repeatable around small children. One such moniker is "Mr. Other Makes," a title given to me because of my predilection for sifting through eBay Motors seeking out automotive misfits and orphans. I've got a soft spot for the dreamers and automakers who take big chances on beancounter-enraging flights of fancy.
I count Nissan among that bunch, because for every safe-as-houses Altima or Sentra that rolls out of its factory gates, the Japanese automaker has often secreted away a little funding for white-space niche vehicles that any sane person wouldn't expect to pencil out. Some, like the Juke, have proven to be massive hits. Others, like the GT-R, have become icons. And then there are models like the Murano CrossCabriolet, a segment-bending mashup the likes of which we haven't seen since the AMC Eagle Sundancer.
Yesterday, upon revealing the new third-generation Murano ahead of its New York Auto Show debut, we reported "the writing appears to be on the wall" for the midsize crossover's novel convertible cousin. It appears we were right. Autoblog can now confirm that the CrossCabriolet will die at the end of this model year, and our source at Nissan tells us unequivocally, "there is no plan for a next-generation Murano CC."