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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.

GM slashes prices in China as sales falter

Buying a vehicle from General Motors' stable of brands might be a lot cheaper in the near future – at least for customers in China. The effort comes as GM hopes to keep sales there growing, and the decision alludes to yet another sign that the Asian country no longer has the booming auto market of past years. GM and its Chinese joint venture partner SAIC are slashing prices by as much as the equivalent to $8,700 on 40 models from Buick, Chevrolet, and Cadillac, according to The Detroit News. Across all of automaker's nameplates, the overall sales dipped in China in April by 0.4 percent to 258,484 vehicles. Among the drops, Buick was down 8.5 percent, and Chevy shrunk 5.6 percent. Caddy's numbers increased 4.6 percent for the month, though. Buick remains a popular brand in the minds of Chinese consumers, but according to The Detroit News domestic automakers there are starting to eat into the dominance of foreign companies in the market. The country remains important for GM, though. Late last year, it outlined a future strategy that included China as a major pillar, including a $14 billion investment to build five new factories and boost sales. News Source: The Detroit NewsImage Credit: Alexander F. Yuan / AP Photo Buick Cadillac Chevrolet GM Car Buying Car Dealers saic

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.