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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.

Grand Prix of the Americas, Day 1 Recap: a city arose in the fields, and it was good

The Circuit of the Americas is the miracle in the fields, the track that no one thought would be finished in time to hold its appointed race. But the Texans got past the turmoil, and even though the heavy machinery was still working on dirt roads as July, come November 18 there was a beautiful, and completed, Formula 1 facility for Travis County to call its own. It was dusty, sure. But it was done, and F1 could come to town.
Infiniti, sponsors of Red Bull Racing, invited Autoblog to watch the first grand prix in America since 2007, and the first GP on a dedicated F1 course since the Phoenix street circuit in 1991. Here's a little recap of what we saw and fount out on day one.

These are the slowest-selling new cars of 2024

While overall sales numbers are a solid indicator of an automaker’s success, another metric can show how well its new vehicles resonate with buyers on the ground. iSeeCars recently released a list of the fastest- and slowest-selling new car companies on the market, and a handful of brands appear to have some catching up to do. Lincoln landed the “top spot” among slow-selling brands, taking an average of 82.6 days to move inventory. Infiniti wasnÂ’t much better, at 79.8 days, and Buick came third with 79 days to sell.  Slowest-selling new cars of 2024 Lincoln: 82.6 days to sell Infiniti: 79.8 Buick: 79 Audi: 75.1 Ram: 69.7 Ford: 68.1 Dodge: 67.4 GMC: 66.6 Acura: 65.4 Lexus: 64.5 iSeeCars executive analyst Karl Brauer noted that the fastest-selling brands, which include Toyota, Alfa Romeo, and Cadillac, likely move inventory because they resonate with buyersÂ’ desire for value and a compelling product. The study also noted that seeing GMC, Ford, and Ram so low on the list likely indicates slowing truck sales, which comprise a significant portion of those brandsÂ’ numbers. ItÂ’s also possible that buyers are turned off by higher prices from those brands. Fast-selling new car brands also appeared on the used car list, where Honda, Lexus, and Toyota dominated. Unfortunately for Lincoln, it also made the slow-selling used list, between Maserati as the slowest and Alfa Romeo in third. iSeeCarsÂ’ analysis also examined EV and hybrid sales and found that hybrids tend to sell much faster than their electric counterparts. In March 2024, new hybrids took an average of 49.5 days to sell, while EVs took 70.6 days. That again brings us to the price and value arguments, where hybrids are significantly less expensive than EVs, though charging and range concerns also likely play a role. By the Numbers Green Buick Infiniti Lincoln Car Buying