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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 Volt replacement battery cost varies wildly, up to $34,000

There's a growing hubbub in the plug-in vehicle community over what looks like some ridiculously cheap replacement batteries for the Chevrolet Volt going up for sale. GM Parts Online, for example, is selling a replacement Volt battery with an MSRP of $2,994.64 but, with an online discount, the price comes down to $2,305.88. For the 16-kWh pack in the 2012 Volt, that comes to a very low $144.11 per kilowatt hour (kWH). But is it a real deal? How can it be, when a Chevy dealer may quote you a price of up to $34,000 to replace the pack? For a 16-kWh Volt pack, $2,305.88 comes to a very low $144.11 per kWh. But is it a real deal? Battery packs in alternative propulsion vehicles are usually priced by the kWh and, historically, they've been thought to be in the range of $500-per-kWh for OEM offerings. Since automakers are understandably secretive about their costs, we still don't know what the real number is today, but we do know it varies by automaker. Tesla, for example, has said it pays less than $200-per-kWH at the cell level but, of course, a constructed pack would be more. Whatever is going on, li-ion battery prices are trending downward. So, $144.11 certainly sounds great, but what's the story here? Kevin Kelly, manager of electrification technology communications for General Motors, reminded AutoblogGreen that GM Parts Online is not the official GM parts website and that, "the costs indicated on the site are not what we would charge our dealers or owners for a replacement battery. There would be no cost to the Volt owner if their battery needs replacement or repair while the battery is under the eight year/100,000 mile limited warranty coverage provided by Chevrolet." A single price tag also can't be accurate for everyone, Kelly said. "If the customer needs to have their battery repaired beyond the warranty, the cost to them would vary depending on what needs to be replaced or repaired (i.e. number of modules, which specific internal components need replacement, etc.)." he said. "So, it's hard for us to tell you exactly what the cost would be to the customer because it varies depending on what might need to be repaired/replaced. As a result, the core charge would vary." But, is the $2,300 price even accurate for anyone? Thanks to a reader comment, we see that this similar item on New GM Parts makes it look like the lithium-ion modules that Kelly mentioned – where a lot of the expensive bits are – are not included.

24 Hours of Le Mans live update part two

We tasked surfing journalist Rory Parker to watch this year's live stream of the 2016 24 Hours of Le Mans. What follows is an experiment to experience the world's greatest endurance race from the perspective of a motorsports novice. Parker lives in Hawaii and can hold his breath longer than he can go without swearing. For Part One, click here. Or you can skip ahead to Part Three here. I write about surfing for a living. If you can call it a living. Basically means I spend my days fucking around and my wife pays for everything. Because she's got a real job that pays well. Brings home the bacon. Very progressive arrangement. Super twenty first century. I run a surf website, beachgrit.com, with two other guys. It's a strange gig. More or less uncensored. Kind of popular. Very good at alienating advertisers. My behavior has cost us a few bucks. I'm terrible at self-censorship. Know there's a line out there, no idea where it lies. I still don't understand any of the technical side. Might as well be astrophysics or something. For contests I do long rambling write ups. They rarely make much sense. Mainly just talk about my life, whatever random thoughts pop into my head. "Can you do something similar for Le Mans?" "Sure, but I know absolutely fuck-all about racing." "That's okay. Just write what you want." "Will do. But you're gonna need to edit my stuff. Probably censor it heavily." So here I am. I spent the last week trying to learn all I can about the sport of endurance racing. But there's only so much you can jam in your head. And I still don't understand any of the technical side. Might as well be astrophysics or something. While I rambled things were happening. Tracy Krohn spun into the gravel on the Forza chicane. #89 is out of the race after an accident I missed. Pegasus racing hit the wall on the Porsche curves. Bashed up front end, in the garage getting fixed. Toyota and Porsche are swapping back and forth in the front three. Ford back in the lead in GTE Pro. #91 Porsche took a stone through the radiator, down two laps. Not good. The wife and I are one of those weird childless couples that spend way too much time caring for the needs of their pet. French bulldog, Mr Eugene Victor Debs. Great little guy. Spent the last four years training him to be obedient and friendly. Nice thing about dogs, when you're sick of dealing with them you can just lock 'em in another room for a few hours. You don't need to worry about paying for college.