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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.

2014 Chevrolet Silverado and GMC Sierra debut all-new designs, three new engines

General Motors has finally dropped the curtain on the 2014 Chevrolet Silverado and 2014 GMC Sierra. Both trucks have undergone substantial revisions with updated versions of the company's 4.3-liter V6, 5.3-liter V8 and 6.2-liter V8 engines. In a shot across the bows of both Ford and Chrysler, GM says it won't use a V6 engine adapted from passenger car applications. Instead, it developed the 4.3-liter engine based on its proven truck-duty architecture.
All three mills will boast direct injection fuel systems as well as a new cylinder head design. Combined with a revised piston, the new engines feature a smaller combustion chamber with a compression ratio of 11:1 or higher depending on the application. Cylinder deactivation and continuously variable valve timing are all part of the recipe, and each engine is paired with a six-speed automatic transmission with auto grade breaking. So far, no fuel economy or horsepower figures have been released, though GM says the new engines will best their predecessors in both areas.
Outside, the trucks feature a number of enhancements to reduce drag and wind noise, and GM claims both the Silverado and Sierra will offer buyers some of the quietest cabins in the class. Extended cab models now feature front-hinged rear doors to allow easier access to the back passenger area, and Crew Cab buyers can now select between a five-foot, eight-inch bed or a six-foot, six-inch bed. Buyers with a mind toward going off road will also rejoice in the return of the Z71 package, complete with Rancho shocks, front tow hooks and additional under-body protection.

Top 11 Lego Technic cars to buy on Amazon in 2024

Autoblog may receive a share from purchases made via links on this page. Pricing and availability are subject to change. I recently got a birthday wish list from my 11-year-old nephew, and I couldn't help but smile when I saw “Lego Technic Cars” at the top. Lego isnÂ’t a phase, itÂ’s a lifestyle. Once a Lego fan, always a Lego fan. In fact, IÂ’d be willing to bet that many of you reading this right now have some kind of Lego vehicle in a box somewhere, or better yet, on display in your home. While theyÂ’re not necessarily cheap, getting into building Lego Technic vehicles doesnÂ’t have to bankrupt you, either, unless you go for the $400 Lamborghini right off the bat. Here are 11 of our favorite Lego Technic vehicles on Amazon, right now, ranging from an affordable $35 all the way up to $450. LEGO Technic Ford Mustang Shelby GT500 Ages 9+ (544 Pieces) - $39.99 (20% off) One of my first and favorite model cars growing up was a first-gen Ford Mustang GT350, so this GT500 for under $40 is right up my alley. At 544 pieces and made for ages 9 and up, the GT500 is a considerable step up from Grave Digger but a great starter to a Technic collection nonetheless. It isnÂ’t the most accurate-looking vehicle in this list, but the AR app and the fact that it can drive make it a worthwhile purchase. $39.99 at Amazon LEGO Technic Formula E Porsche 99X Electric Ages 9+ (422 Pieces) - $49.99 Not a Ford fan? Not a problem. This Formula E Porsche 99X is the same price and better looking than the GT500. Even though there are 122 fewer pieces in this Porsche set, it has a level of detail seen in much more expensive Technic sets including numerous decals and a pull back motor.  $49.99 at Amazon LEGO Technic Jeep Wrangler Ages 9+ (665 Pieces) - $54.99 This is the set I ended up going with for my nephew, not because I think it is the coolest, but because for the price, I think you get the most bang for your buck. 665 pieces is over 50% more than the comparatively priced Porsche 99X and it also scratches the nostalgia itch for me: The first-ever model vehicle I built was a yellow Jeep Wrangler Sahara. This Wrangler Rubicon has definitely had some aftermarket mods like the front winch, which makes it one of the coolest Technic sets under $60.  $54.99 at Amazon LEGO Technic Monster Jam Grave Digger Ages 7+ (212 Pieces) - $34.16 If ever there was a gateway Lego Technic, this Grave Digger is it.