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Chevy's 6.6-liter Duramax is pretty much all new

To say there's a heated battle in heavy-duty pickups is an understatement, with Chevrolet, Ford, and Ram constantly trading blows of increased torque, horsepower, and towing capacity. The latest salvo is the revised, more powerful turbo diesel 6.6-liter Duramax V8 in the 2017 Chevy Silverado. It has 910 pound-feet of torque, an increase of 145, putting it nearly level with the Ford Super Duty. Here's a closer look at where those gains come from. How exactly did Chevrolet add all that torque plus 48 horsepower? The automaker essentially took a fine-tooth comb to the entire engine. Chevy says it changed 90 percent of the V8, and the cumulative effect of those small changes adds up to big increases. As you might guess, the turbocharger is updated. The larger unit features electric actuation of the variable nozzle turbine (VNT), and what Chevy calls a double axle cartridge mechanism that separates the VNT moving parts from the housing. That helps with heat performance as well, with a claim that the exhaust side of the turbo can run continuously up to 1,436 degrees Fahrenheit. Helping that cause are six exhaust gaskets made of Inconel - an nickel alloy that contains chromium and iron – and upgraded stainless steel for the exhaust manifold. Despite having the same cast iron cylinder block, albeit with some minor enhancements, the engine has new cylinder heads, pistons, piston pins, connecting rods, and crankshaft, which have all been upgraded to handle 20 percent higher cylinder pressures. Alongside the increase in pressure, Chevrolet also increased the cylinder head's structure with a honeycomb design. The pattern features high-strength aluminum with dual layer water jackets that not only improve strength, but also optimize water flow for better cooling. For 2017, the cylinder head also benefits from integrated plenum that aids the engine in getting more air under heavy loads. The cylinder head isn't the only component to get a minor update, as the pistons have a larger diameter pin for improved oil flow. The same detailed improvements has been bestowed to the humble connecting rods (second in our hearts only to the inanimate carbon rod). The new design has the bolts oriented roughly 45-degrees to the rod instead of parallel. The angle split design, as it's called allows for easier passage through the cylinder.

Chevy Spark EV could be coming to Midwest later this year

Ohio is not known as a hotbed of EV sales – if anything, the state is a bit anti-EV, thanks to a legislative fight against Tesla's direct sales model – but it might be on Chevrolet's short list to expand the market for the Spark EV in the near future. The latest official GM press release on the battery-powered Spark still says the car is "available exclusively in California and Oregon," but Hybrid Cars found four Ohio dealerships that list a Spark EV on their websites, with hints the the car will be coming to the Midwest state by the end of the summer. See, for example, here, here, here and here. But that's probably not going to happen, according to Randy Fox, GM communication's manager for passenger cars. Fox told AutoblogGreen that, "At this point in time, we don't have any official plans to expand the Spark EV beyond California and Oregon." The reason is that California and Oregon have the infrastructure to support EVs, Fox said, and GM wants to be able to support its EV customers. "We are continuing to look at other options," he said. "The selling point for electric cars today is not advertising, it's eyeballs, it's peer exposure" – John O'Dell John O'Dell, a senior editor at Edmunds.com, told AutoblogGreen that, "It makes sense for [GM] to expand sales and it makes sense to do it in a quiet manner, to get these vehicles on the road. The selling point for electric cars today is not advertising, it's eyeballs, it's peer exposure. If someone in my neighborhood has one and he likes it, then maybe I can trust him. So it's important to get these vehicles on the road." Chevy sold 182 Spark EVs last month, a significant increase over the 98 sold in April. That's still small potatoes compared to the 3,000+ Nissan Leaf EVs sold last month, but making the electric Spark available in Ohio, say, or GM's home state of Michigan could boost those numbers. AutoblogGreen called a few dealerships in Michigan to see what they had heard. One salesman said he didn't think GM had started production yet but the inventory manager for another dealership said the Spark EV is scheduled to arrive in the Midwest in "roughly the fourth quarter." What would GM's incentive be to offer the car in markets outside of California where it can gain ZEV credits with each sale?

Recharge Wrap-up: Chevy Spark EV in Canada, Audi to use Valeo electric supercharger

The Chevrolet Spark EV will become available to retail customers in Canada. "We're expanding our electric vehicle offerings to our customers by offering the 2016 Spark EV for retail sales in the growing EV markets here in Quebec as well as in Ontario and BC," says Chevrolet's Chris Hay. Chevrolet has not yet released pricing for the Spark EV in Canada. In the US, the Spark EV is available in California, Oregon and Maryland. Read more at Hybrid Cars. Four recreational vehicle companies in Texas have settled with the EPA over illegal import and sale of off-road vehicles. The 4,000-plus Hammerhead brand vehicles in question were imported without the proper certification, a violation of the Clean Air Act. Some vehicles lacked proper emission control equipment or were manufactured by a company not listed on the certificate application. The settlement totals $560,000 in civil penalties for the companies involved. Read more from the EPA. The Iowa Supreme Court has upheld the state's natural gas tax, which was challenged by the ethanol industry. Ethanol producers, which use natural gas to make ethanol, argued the complicated tax was unconstitutional, as it forced certain plants to pay more than their competitors. Taxes vary by location, and some plants have to tap into interstate pipelines at much higher tax rates rather than get it from a local utility. Now, ethanol producers will work to change the law. "My hope is that people understand that, something may be constitutional but that doesn't make it good public policy," says Iowa Renewable Fuels Association Executive Director Monte Shaw. Read more at Manufacturing.Net. Audi will use Valeo's electric superchargers to improve fuel economy and acceleration. Valeo says Audi will launch a vehicle using its electric supercharger next year, with other reports suggesting that car will be the Audi Q7. The company says other unspecified automakers will also use the technology in their vehicles. While the electric supercharger adds to the vehicle's cost and electric energy use, it can improve fuel economy by as much as 20 percent. Read more at Automotive News Europe. Featured Gallery Chevrolet Spark EV View 13 Photos Related Gallery 2016 Audi Q7: Detroit 2015 View 15 Photos News Source: Hybrid Cars, EPA, Manufacturing.Net, Automotive News EuropeImage Credit: Chevrolet Government/Legal Green Audi Chevrolet Alternative Fuels Emissions Ethanol Fuel Efficiency Electric Off-Road Vehicles recharge wrapup