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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 New Micra headed for Canadian showroom after Montreal reveal?

Fresh off news that Mitsubishi is bringing a sedan version of its Mirage, called the G4, to this month's Montreal Auto Show, we now believe that another small car will be debuting for our small-car-loving friends to the north. Word is that Nissan will be bringing its compact New Micra to the Canadian show, as well. Slotting in just below the Versa Note hatchback in terms of both size and price, the Montreal debut should be followed up with an on-sale date in short order.
We've been hearing rumors that the New Micra would end up in Canadian dealerships for some time. At every turn, however, we've also heard that the Franco-Japanese hatch is not intended for sale in the US, and nothing in this latest report from Autos.ca would seem to indicate otherwise. As Autoblog sources are quick to point out, Nissan already has one of the least-expensive offerings in the US, the $11,990 Versa Sedan, and the Japanese automaker just doesn't see room underneath it for another model. Sorry, Yank.

2018 Nissan Kicks vs other tiny crossovers: How they compare on paper

Update: As we now have now driven the 2018 Nissan Kicks and have all the specs and figures available, we thought it was time to update this comparison post. The data chart has been updated with final Kicks information as well as changes to competitors made for 2019. Anyone else have "Pumped Up Kicks" by Foster the People stuck in their heads? Well, you do now. I couldn't be the only one. Anyway, the 2018 Nissan Kicks is a thing. It replaces the Nissan Juke, which Mr. Stocksdale thought was a bad idea and Mr. Myself thought was a smart idea. Nevertheless, neither of us were especially pumped up by the Kicks. However, the majority of car buyers are all about SUVs, and this littlest segment of them has been multiplying like Tribbles in the past few years. The Juke was one of the first of these subcompact crossovers, but it was probably too oddball for a mainstream audience (not to mention inefficient) and never really caught on. Newer competitors certainly didn't help. Well, to see how the Kicks compares to those very competitors, lets fire up the Autoblog Comparo Generator 3000 (TM). Specifically, we'll be looking at those subcompact crossovers with similarly small dimensions, especially low prices and/or a disinclination to offering all-wheel drive. We're talking about the Nissan Kicks vs the Toyota C-HR, Hyundai Kona, Kia Soul, Honda HR-V and Jeep Renegade. Now, if you're interested in literally the exact opposite SUV segment, check out our recent Mercedes G-Class comparo. Otherwise, on to the spreadsheet: Dimensions and passenger space In terms of exterior dimensions, the new Kicks is right smack in the middle of the segment. It's virtually the same as the Honda HR-V, yet manages to eek out a few extra cubic feet of cargo space behind its raised back seat. The Honda and its "Magic Seat" still beats it in terms of maximum capacity, but it sure is close. The Kia Soul has the biggest maximum number, but that's largely the result of being a box. Its small behind-the-back-seat cargo number is likely a better indicator of how much you'll be dealing with on a day-to-day basis. And in that day-to-day way, the Kicks is excellent. Backseat legroom seems to be a Kicks downside, as all but the C-HR surpass it. (Seriously, it's almost impressive how large the C-HR is on the outside but cramped inside.) However, the Kicks' tall greenhouse not only allows for ample headroom, but seats that are mounted high off the ground.