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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.

Driving the Maserati MC20 and BMW i7 | Autoblog Podcast #802

In this episode of the Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Senior Editor, Green, John Beltz Snyder and Road Test Editor Zac Palmer. They're amped up about the BMW i7 and Maserati MC 20 they've all been driving. They also opine about the BMW M3 CS and 2024 Ford Mustang. The Japan Mobility Show (formerly Tokyo Motor Show) is coming up, and there have been some interesting reveals and teasers, including the Nissan Hyper Urban and Hyper Adventure concepts, some neat kei car concepts from Daihatsu, a Miata-inspired EV concept from Mazda and an electric sports coupe concept from Subaru. Finally, they discuss the wild situation surround last weekend's Formula 1 Qatar Grand Prix. Send us your questions for the Mailbag and Spend My Money at: Podcast@Autoblog.com. Autoblog Podcast #802 Get The Podcast Apple Podcasts – Subscribe to the Autoblog Podcast in iTunes Spotify – Subscribe to the Autoblog Podcast on Spotify RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Rundown Cars we're driving 2023 BMW i7 2023 Maserati MC20 2024 BMW M3 CS 2024 Ford Mustang GT Japan Mobility Show preview Nissan Hyper Urban and Hyper Adventure concepts Daihatsu kei car concepts Possible next-gen Mazda Miata Subaru electric sports car Formula 1 Qatar Grand Prix recap Feedback Email – Podcast@Autoblog.com Review the show on Apple Podcasts Autoblog is now live on your smart speakers and voice assistants with the audio Autoblog Daily Digest. Say “Hey Google, play the news from Autoblog” or "Alexa, open Autoblog" to get your favorite car website in audio form every day. A narrator will take you through the biggest stories or break down one of our comprehensive test drives. Related video: Green Motorsports Podcasts Tokyo Motor Show BMW Ford Maserati Mazda Nissan Subaru

Car theft skyrockets thanks to rising parts prices

Cars and trucks today have achieved a high level of average quality, with safety and technology features that keep occupants safer than ever and meet consumers' high expectations. But the National Insurance Crime Bureau finds that those components come with a rising price tag, leading to expensive repair bills — and rising vehicle thefts to support a thriving black market for parts. The nonprofit NICB said it looked at the cost of replacement parts for the top 10 stolen 2016 models, with average OEM part prices pulled from a database of more than 24 million vehicle damage appraisals generated for 2016 and 2017 insurance claims. The list did not include major components like engines or transmissions, only easily-stripped components like bumpers, doors, hoods and headlights. It found that: The 2016 Toyota Camry, which had a used market value of around $15,000, had 15 commonly replaced parts that added up to almost $11,000, not including labor, with quarter panels alone costing almost $1,600 a pair and a set of alloy wheels tallying more than $1,600. The Camry was also the top stolen vehicle in 2016 at 1,113 thefts. A 2016 Nissan Altima had 14 standard parts worth more than $14,000, including a single headlamp assembly that costs just over $1,000. The Altima was the second-top stolen vehicle in 2016 at 1,063 vehicles stolen. And the 2016 GMC Sierra pickup, which was No. 7 on the 2016 top-stolen list, rang up $21,000 from 20 standard components, including an $1,100 headlamp assembly and an $1,100 rear bumper. "For the professional theft ring, stealing and stripping vehicles for parts has always been a lucrative business," Jim Schweitzer, NICB's senior vice president and chief operating officer, said in a statement. "On today's cars and trucks, the parts are often worth more than the intact vehicle and may be easier to move and sell. That's why we see so many thefts of key items like wheels and tires and tailgates ... there's always a market for them." Check out the NICB infographic below. Vehicle thefts in the U.S. rose by more than 4 percent in 2017, based on preliminary FBI data, after rising 7.6 percent in 2016, though the overall trend has been down since vehicle thefts peaked in 1991, according to the NICB. Related Video: Image Credit: National Insurance Crime Bureau Aftermarket GMC Nissan Toyota Auto Repair Insurance Ownership auto parts car values stolen car nicb national insurance crime bureau components