on 2040-cars

Auto blog

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.

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.

Recharge Wrap-up: NEDC's NOx problems, autonomous Chevy Volts

The International Council on Clean Transportation (ICCT) found a significant difference in NOx emissions in Euro 6 diesel cars in NEDC and WLTC testing. While 88 percent of the cars tested met emissions standards for NEDC, NOx emissions averaged five times higher under WLTC, with only 27 percent of vehicles under the limit. WLTC is considered to be a more realistic driving cycle, using hot starts and factoring a higher top speed as well as harder and more frequent accelerations than the NEDC. Read more at Green Car Congress.GM Canada will build a fleet of autonomous 2017 Chevrolet Volts. The self-driving Volts will be deployed for testing at GM's Warren, Michigan Technical Center. Employees will be able to use a carsharing app to reserve a car, which will then drive itself to the set destination. The project will allow GM to collect important data and experience to help the company more quickly develop autonomous driving technology. Read in a press release more from GM Canada, or at Green Car Congress.Carwatt is showing an electric Renault Trafic powered by second-life batteries at the COP21 environmental summit in Paris. The lithium-ion batteries used to power the EV were recycled from other Renault EVs. With the electric Trafic, Carwatt – a company that converts vehicles to use electric power – aims to demonstrate the "circular economy" of batteries, which can provide more value through a longer lifecycle. Read more in the press release below. Carwatt presents a unique automotive application for second-life batteries from electric vehicles. On the sidelines of the COP21 summit, in the Solutions Gallery running from 2 to 9 December 2015 in Le Bourget near Paris, Carwatt and its partners —Renault, Paris City Council, BPI France, the Ales Ecole des Mines Engineering School, and the Bobigny Business Campus — are showing a very special electric Renault Trafic. This prototype vehicle, the only one of kind in the world, is powered by second-life lithium-ion batteries recycled from Renault electric cars. Circular economy at work with electric vehicles When, over time, the batteries of a Renault electric vehicle fall the performance threshold specified for their initial automotive power duty (around 75% of initial capacity), they can still provide valuable service in "second-life" applications before end-of-life disposal at a recycling centre. Experiments are already under way on power storage applications, for example.