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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.

Renault-Nissan debuts new Common Module Family for future vehicles

Platform sharing is nothing new for the 14-year-old Renault-Nissan Alliance, but this partnership is set to introduce new modular platform components that will eventually underpin 11 Renault models and three Nissan vehicles by 2020. Rather than being a typical platform, the Common Module Family (CMF) actually represents five segments of a platform that can be used in various applications, and one of the first vehicles to use this architecture will be the 2014 Nissan Rogue (spy shots of which are shown below) when it arrives "in late 2013."
As pictured in the image above (click to expand), CMF is composed of four chassis component, principally the front underbody, rear underbody, engine bay and cockpit as well as a common electrical system. Besides the next-gen Rogue, future Nissan models to share CMF will include the Qashqai and X-Trail, while Renault models will start using the platform next year on vehicles including the Scénic and Laguna. The CMF architecture is expected to help the Alliance reduce the parts cost of a vehicle by up to 30 percent and reduce the entry cost by up to 40 percent. The official press release with more details about CMF, and what it means for Renault-Nissan, is posted below.

2016 Civic, Sonata, Lexus RX, and Altima earn TSP+ from IIHS [w/videos]

The 2016 Honda Civic sedan, Hyundai Sonata, Lexus RX, and Nissan Altima started the year with a bang by earning Top Safety Pick+ honors from the Insurance Institute for Highway Safety. They join 48 other 2016 model year vehicles that IIHS already tested that received the agency's top safety marks. These four models met the IIHS' latest requirement, scoring the agency's best possible score in all five of its crash tests – front, side, rear, rollover, and the difficult small-overlap – to be eligible for the safety accolade. Hyundai improved the 2016 Sonata's structure after the sedan's production began, so this rating only applied to examples produced after October. To get the TSP+ honor, a vehicle's crash prevention tech needs to earn least two points on the IIHS' scale. The lower Top Safety Pick designation can go to model with a "basic" version of these systems like a front collision warning. The Civic, Sonata, and RX scored the maximum six points to get "superior" scores for their optional crash prevention tech because they avoided collisions at up to 25 miles per hour. The Altima was successful in a 12-mph test, but the system slowed the sedan by 10 mph in the 25-mph test rather than completely stopping it. Therefore, the agency awarded the Nissan five points, which was still a "superior" score. You can watch the small-overlap tests for the Civic, RX, Altima, and Sonata respectively below. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. Four more vehicles earn the 2016 TOP SAFETY PICK+ award ARLINGTON, Va. — The Honda Civic 4-door, Hyundai Sonata, Lexus RX and Nissan Altima are the latest vehicles to earn the top award from the Insurance Institute for Highway Safety. The four vehicles join the 2016 winner's circle just one month after the initial crop of 48 TOP SAFETY PICK+ winners was announced. The requirements for TOP SAFETY PICK+ were tightened for 2016. To qualify, winners must earn good ratings in each of the Institute's five crashworthiness tests and have an available front crash prevention system earning an advanced or superior rating.