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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.

Compact SUV Comparison: Specs, pics and reviews of every brand's crossover

Honda CR-V vs Toyota RAV4. Chevy Equinox vs Ford Escape. Mazda CX-5 vs Subaru Forester. Whichever combinations of compact crossover SUV you're considering, there's probably a comparison test or chart out there to read. Heck, you can even create a three-car comparison yourself here at Autoblog. However, if you want a bunch of that information all in one convenient place, well, here it is. Our mega comparison of specs, features and photos of compact SUV entries from every mainstream manufacturer that sells them. That includes the 2018 Chevrolet Equinox, 2018 Ford Escape, 2018 GMC Terrain, 2018 Honda CR-V, 2018 Hyundai Tucson, 2019 Jeep Cherokee (it's already on sale with notable changes from 2018), 2018 Jeep Compass, 2018 Kia Sportage, 2018 Mazda CX-5, 2018 Mitsubishi Eclipse Cross (none of Mitsu's SUVs are perfect fits for this segment, so we deemed the MEC the most competitive fit), 2018 Nissan Rogue, 2018 Subaru Forester, 2018 Toyota RAV4 and 2018 Volkswagen Tiguan. We can update this comparison as more information about 2019 models is released, most notably the Forester and RAV4. Now, there are certainly some models that are smaller (Nissan Rogue Sport) or larger (Kia Sorento) that could also be considered, but we figured it was wise to stick with those in this sweet spot of comparable size and price. We also included links to Autoblog reviews, buying guides and smaller comparisons. Engines and Transmissions With rare exception, this segment features four-cylinder power. Sometimes it's turbocharged, often its not, but standard engine outputs are generally in the same ballpark. Therefore, we'd recommend focusing on torque output, as it's what will make a difference around town or when passing, and weighing that versus fuel economy (the Chevy Equinox, GMC Terrain, Honda CR-V and Mazda CX-5 make particularly strong cases in this regard). Many drivers aren't too fond of continuously variable transmissions (CVT), either, so that's another thing to consider and note during a test drive. As you can see, several models are available with performance upgrades. Besides the Jeep Cherokee's available V6, all are more powerful turbocharged four-cylinder engines. The exception to this would be the Honda CR-V and Ford Escape, as their 1.5-liter turbo engines don't prioritize performance. Instead, they serve as overall upgrades to the base naturally aspirated engines standard on only their base trim levels (CR-V LX and Escape S).

CNG-powered Chevy Sonic, Cruze headed your way

The value proposition for a Crazy Diamond Performance CNG ride was a little bit better before gas prices took a dive in the past month. Still, the Michigan-based company, which converts some of Chevrolet's compact vehicles to run on compressed natural gas, received approval late last month from the US Environmental Protection Agency (EPA) for two of its conversion models. And CNG is still pretty cheap. Crazy Diamond will start selling CNG versions of both the Chevrolet Cruze and Chevrolet Sonic. The startup will target fleet operators looking to cut both refueling costs and their carbon footprint. CNG can be found in much of the country in the low $2 range, while the average CO2 emissions are about 25 percent less than those of similar gas-powered vehicles. Average gas prices have tumbled by more than 30 cents a gallon in the last month, according to AAA, but they're still at close to $3. The two models will be able to go almost 300 miles on a full tank of CNG. Crazy Diamond said this summer that it would start selling converted a CNG-powered Cruze that delivers 130 horsepower for as low as $26,000. The turbocharged version goes for about $28,000. Take a look at Crazy Diamond Performance's celebratory press release below. Crazy Diamond Performance recieves EPA approval on its CNG Cruze and Sonic CDP receives EPA approval for its Mono-Fuel CNG Cruze and Sonic. Shelby Township, Michigan, October 30, 2014– Crazy Diamond Performance (CDP) receives EPA approval on its Mono-Fuel Compressed Natural Gas (CNG) Chevrolet Cruze and Chevrolet Sonic. Crazy Diamond Performance has received EPA approval on two new mono-fuel small passenger vehicles, the CNG Chevrolet Cruze and CNG Chevrolet Sonic. These new mono-fuel CNG platforms are the first of a series of small and fuel efficient vehicles coming from CDP, where cost, low emissions and reduced fuel consumption is important for not only fleet owners, but to the general public as well. "Soon to be available, are the 1.8L and 1.4L Cruze and Sonic CNG retrofit systems. These two vehicles represent a change in the status quo, with an OEM level integration of the fuel system and its components" states Michelle Fern, Executive Vice President CDP Inc. These vehicles provide flexibility for fleets looking to purchase a domestic small mono-fuel passenger sedan, but have not had an option until now. There are significant emissions benefits over its gasoline counterpart, with an average reduction in Carbon Dioxide (CO2) of 25%.