2001 Nissan Altima Gxe Sedan 4-door 2.4l 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.

California to stop buying GM, Toyota and Fiat Chrysler vehicles over emissions fight

WASHINGTON — California said on Monday it will halt all purchases of new vehicles for state government fleets from GM, Toyota and Fiat Chrysler and other automakers backing President Donald Trump in a battle to strip the state of authority to regulate tailpipe emissions. Between 2016 and 2018, California purchased $58.6 million in vehicles from General Motors, $55.8 million from Fiat Chrysler Automobiles, $10.6 million from Toyota Motor and $9 million from Nissan. Last month, GM, Toyota, Fiat Chrysler and members of the Global Automakers trade association backed the Trump administration's effort to bar California from setting tailpipe standards, which are more rigid than Washington's proposed national standards. The automakers declined or did not immediately comment on California's announced ban on purchases of their vehicles. Starting in January, the state will only buy from automakers that recognize California's legal authority to set emissions standards. Those automakers include Ford, Honda, BMW AG and Volkswagen AG, which struck a deal with California in July to follow revised state vehicle emissions standards. "Car makers that have chosen to be on the wrong side of history will be on the losing end of CaliforniaÂ’s buying power," California Governor Gavin Newsom said in a statement. California purchased $69.2 million in vehicles from Ford over the three-year-period, $565,000 from Honda and none from the German automakers. The state also disclosed it will immediately no longer allow state agencies to buy sedans powered by an internal combustion engine, with exemptions for certain public safety vehicles. California's vehicle rules have been adopted by 13 other states. On Friday, California and 22 other U.S. states challenged the Trump administration's decision to revoke California's legal authority to set vehicle tailpipe emissions rules and require a rising number of zero emission vehicles (ZEV). The move follows a separate lawsuit filed in September by the states against the National Highway Traffic Safety Administration seeking to undo a parallel determination. In August 2018, the Trump administration proposed freezing fuel efficiency requirements at 2020 levels through 2026, reversing planned 5% annual increases. The Trump administrationÂ’s final requirements are expected in the coming months and are set to modestly boost fuel efficiency versus the initial proposal, with several automakers anticipating annual increases of about 1.5%.

2013 Nissan Pathfinder: January 2013

We've now had our long-term 2013 Nissan Pathfinder for about a month, and some impressions are starting to solidify, while others remain contentious among the team. Most notable among those contentious items is our Pathfinder's paint color, which was chosen by vote among the Autoblog team.
Dubbed Mocha Stone, it beat out Cayenne Red by a single vote. I was a Mocha Stone supporter and like it even more in person than on Nissan's configurator. It's a mature choice that can be comfortably placed in the grouping of silver, white and gray tones buyers routinely choose most often over all the colors of the rainbow offered on cars these days for the sake of attention. Staunch opponents of Mocha Stone on the team remain unswayed. Democracy is a difficult process, people.