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    Recalling The Recall: GM Clarifies The 2014 CTS Recall


    • Whoops!

    Time for a bit of an inception moment. Today, General Motors is recalling one of their recalls that was issued on Monday. The company explained that the one pertaining to the 2014 CTS doesn't cover all of the CTSes. Wait, we just made that somewhat confusing. The 2014 CTS Coupe and Wagon, which are based on the second-generation model are effected by this recall. The 2014 CTS sedan, which is brand new isn't a part of this.

    Why GM didn't make this clarification when they announced the recall is unknown. Our best guess is that GM was in rush when getting these recalls out and forgot to note that.

    Source: Detroit Free Press

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    Better to over recall and then recall with clarification in today's news where news and politicians wants to cremate you to get voters and viewer points than to not recall and get caught with having missed it. I am perfectly happy with GM do this and shows they are paying attention.

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    • By William Maley
      It has been about five years since a Cadillac V series model has graced either one the Cheers & Gears’ garages (if you’re wondering, that would be the 2011 CTS-V Coupe that our Managing Editor drove). It isn’t for our lack of trying. I can give you a stack of emails to the person who handles General Motors’ fleet in Detroit that list the ATS-V and CTS-V as a possible test vehicle. But if you keep bugging someone over time, something is bound to change. That is what happened this summer as a Cadillac ATS-V coupe rolled into the Cheers and Gears’ Detroit garage. Was it worth the wait? 
      The standard Cadillac ATS coupe is already a model that stands out in crowd thanks to an aggressive look. The V turns that aggressiveness up to eleven. The front features a dual mesh grille setup (a small one on top and a larger one below), a narrow slot between the grille and hood; and a new bulging hood with an air extractor. A set of optional eighteen-inch alloy wheels fill in the wheel wells nicely and show off the massive Brembo brakes. The back comes with a rear wing and diffuser with quad exhaust tips.
      Our ATS-V tester featured the optional Carbon Fiber package that adds an exposed carbon fiber weave for the front splitter, hood extractor, and rear diffuser. It also comes with a larger rear wing and extensions for the rocker panels. I’ll admit I found the carbon fiber package to be a bit much with our tester’s red paint at first. It’s like going into an important meeting wearing a zoot suit and alligator shoes. You’ll make an impression, but is it the one you want to put out into the world? I did grow to like this combination as the week went on. That said, I would skip the carbon fiber package. For one, you have to very careful not cause any damage to lower parts when driving over speed bumps and other road imperfections. For example, the low ride height makes it easy for the front splitter to be cracked. Second, this optional package is $5,000. There are better ways you can use that $5,000 such as getting a new set of tires or a plane ticket to get you over to Cadillac’s V driving school.
      Inside, the ATS-V is a bit of a disappointment. For the nearly $80,000 price tag of our tester, you would think that it would look and feel the part. In certain areas, the ATS-V does. Cadillac has appointed parts of the interior with carbon fiber and suede to give it a sporty feel. Our tester featured the optional Recaro seats which are the first set I actually liked sitting in. A lot of this is due to how you could adjust seat bolstering to make yourself actually fit into the seat, not sitting on top of it. 
      But this where the good points end with the ATS-V’s interior. Despite all of the premium touches Cadillac has added, it doesn’t feel like it is worth the price. Take for example the center stack with CUE. It is just a sheet of piano black trim and makes the interior feel somewhat cheap. You’ll find more piano black trim throughout the interior which reinforces this. The instrument cluster is the same that you’ll find in the standard ATS only with a different font. It would have been nice if Cadillac could have pulled the 12.3-inch screen setup they use on the CTS-V as it looks nicer and would provide the key details needed for a driver. CUE still hasn’t gotten any better in terms of performance and overall usability. Yes, Cadillac has added Apple CarPlay and Android Auto integration to CUE. But we had issues with CarPlay with the system not recognizing our phone and apps crashing. The back seat? Just use it for storage. Trying to fit someone back there could cause you to be accused of cruel and unusual punishment.
      Power for the ATS-V comes from a twin-turbo 3.6L V6 with 464 horsepower and 445 pound-feet of torque. This can be paired with either a six-speed manual or our tester’s eight-speed automatic. Start up the engine and it delivers a meaty, if somewhat muted growl. Don’t let that fool you, this engine will throw you in the back of your seat with no issue. Yes, the turbos do mean you’ll have a moment or two for that rush of power to arrive. But once the turbos spool, hold on. Power comes on at a linear rate and never lets up. The eight-speed automatic delivers crisp upshifts, but it does take a second or so for it to downshift. If you’re wondering about fuel economy, the EPA rates the ATS-V automatic at 16 City/24 Highway/19 Combined. Our average for the week landed around 18 mpg.
      Where the ATS-V truly shines is in the handling. The first time I took the ATS-V down a curvy road, I was gobsmacked at how well it hustled around the corners with no issues. Enter into a corner and ATS-V hunkers down thanks to sticky Michelin Pilot Sport. There is little body roll and the steering provides quick and precise turn-in. The ATS was already a pretty decent handling car, but Cadillac knew that it could be better. The stiffness of the chassis has been increased by 25 percent and there is the newest version of GM’s Magnetic Ride Control system that is faster when it comes adjusting the damping characteristics of the shocks. Three modes (Touring, Sport, and Track) can vary the stiffness of the shocks along with the behavior of the engine and steering. 
      When you decided that you had enough fun and it is time to go back to the daily grind, the ATS-V turns into a comfortable cruiser. With the vehicle in Touring mode, the ride is compliant with some bumps making their way inside. Road and wind noise is kept to very acceptable levels.
      One item that we were disappointed not to have on our test ATS-V was blind spot monitoring. This is part of a $1,500 Safety and Security package that also adds lane keep assist, forward collision alert, rear-cross traffic alert, and more. For a vehicle that begins that begins just a hair over $62,000, you think blind spot monitor would be standard. It should.
      Cadillac has been making great strides since the first-generation CTS-V and the ATS-V is the beneficiary of it. The powertrains will nail you to your seats and the handling can match or surpass the class leaders. But Cadillac is still stumbling over some simple things such as the interior materials and the infotainment system. It is an amazing driving vehicle, but it is let down by the interior.
      At the end of the week, I couldn’t deny this is an impressive vehicle even with the interior issues. It was very much worth the long wait.
      Cheers: Jaw-Dropping performance, Sharp handling, Looks that make it stand out from the crowd
      Jeers: Carbon Fiber package isn't worth the money or worry, Interior doesn't feel like it is worth the price, CUE
      Disclaimer: Cadillac Provided the ATS-V, Insurance, and One Tank of Gas
      Year: 2016
      Make: Cadillac
      Model: ATS-V Coupe
      Trim: N/A
      Engine: 3.6L SIDI DOHC Twin-Turbo V6
      Driveline: Eight-Speed Automatic, Rear-Wheel Drive
      Horsepower @ RPM: 464 @ 5,850
      Torque @ RPM: 445 @ 3,500
      Fuel Economy: City/Highway/Combined - 16/24/19
      Curb Weight: 3,803 lbs
      Location of Manufacture: Lansing, MI
      Base Price: $62,665
      As Tested Price: $79,205 (Includes $995.00 Destination Charge)
      Options:
      Carbon Fiber Package - $5,000.00
      Recaro Performance Seats - $2,300.00
      Luxury Package - $2,100.00
      8-Speed Automatic Transmission - $2,000.00
      Performance Data Recorder - $1,300.00
      Power Sunroof - $1,050.00
      18-inch Polished Wheels - $900.00
      Dark Gold Brembo Calipers - $595.00
      Sueded Microfiber Steering Wheels and Shifter - $300.00

      View full article
    • By William Maley
      It has been about five years since a Cadillac V series model has graced either one the Cheers & Gears’ garages (if you’re wondering, that would be the 2011 CTS-V Coupe that our Managing Editor drove). It isn’t for our lack of trying. I can give you a stack of emails to the person who handles General Motors’ fleet in Detroit that list the ATS-V and CTS-V as a possible test vehicle. But if you keep bugging someone over time, something is bound to change. That is what happened this summer as a Cadillac ATS-V coupe rolled into the Cheers and Gears’ Detroit garage. Was it worth the wait? 
      The standard Cadillac ATS coupe is already a model that stands out in crowd thanks to an aggressive look. The V turns that aggressiveness up to eleven. The front features a dual mesh grille setup (a small one on top and a larger one below), a narrow slot between the grille and hood; and a new bulging hood with an air extractor. A set of optional eighteen-inch alloy wheels fill in the wheel wells nicely and show off the massive Brembo brakes. The back comes with a rear wing and diffuser with quad exhaust tips.
      Our ATS-V tester featured the optional Carbon Fiber package that adds an exposed carbon fiber weave for the front splitter, hood extractor, and rear diffuser. It also comes with a larger rear wing and extensions for the rocker panels. I’ll admit I found the carbon fiber package to be a bit much with our tester’s red paint at first. It’s like going into an important meeting wearing a zoot suit and alligator shoes. You’ll make an impression, but is it the one you want to put out into the world? I did grow to like this combination as the week went on. That said, I would skip the carbon fiber package. For one, you have to very careful not cause any damage to lower parts when driving over speed bumps and other road imperfections. For example, the low ride height makes it easy for the front splitter to be cracked. Second, this optional package is $5,000. There are better ways you can use that $5,000 such as getting a new set of tires or a plane ticket to get you over to Cadillac’s V driving school.
      Inside, the ATS-V is a bit of a disappointment. For the nearly $80,000 price tag of our tester, you would think that it would look and feel the part. In certain areas, the ATS-V does. Cadillac has appointed parts of the interior with carbon fiber and suede to give it a sporty feel. Our tester featured the optional Recaro seats which are the first set I actually liked sitting in. A lot of this is due to how you could adjust seat bolstering to make yourself actually fit into the seat, not sitting on top of it. 
      But this where the good points end with the ATS-V’s interior. Despite all of the premium touches Cadillac has added, it doesn’t feel like it is worth the price. Take for example the center stack with CUE. It is just a sheet of piano black trim and makes the interior feel somewhat cheap. You’ll find more piano black trim throughout the interior which reinforces this. The instrument cluster is the same that you’ll find in the standard ATS only with a different font. It would have been nice if Cadillac could have pulled the 12.3-inch screen setup they use on the CTS-V as it looks nicer and would provide the key details needed for a driver. CUE still hasn’t gotten any better in terms of performance and overall usability. Yes, Cadillac has added Apple CarPlay and Android Auto integration to CUE. But we had issues with CarPlay with the system not recognizing our phone and apps crashing. The back seat? Just use it for storage. Trying to fit someone back there could cause you to be accused of cruel and unusual punishment.
      Power for the ATS-V comes from a twin-turbo 3.6L V6 with 464 horsepower and 445 pound-feet of torque. This can be paired with either a six-speed manual or our tester’s eight-speed automatic. Start up the engine and it delivers a meaty, if somewhat muted growl. Don’t let that fool you, this engine will throw you in the back of your seat with no issue. Yes, the turbos do mean you’ll have a moment or two for that rush of power to arrive. But once the turbos spool, hold on. Power comes on at a linear rate and never lets up. The eight-speed automatic delivers crisp upshifts, but it does take a second or so for it to downshift. If you’re wondering about fuel economy, the EPA rates the ATS-V automatic at 16 City/24 Highway/19 Combined. Our average for the week landed around 18 mpg.
      Where the ATS-V truly shines is in the handling. The first time I took the ATS-V down a curvy road, I was gobsmacked at how well it hustled around the corners with no issues. Enter into a corner and ATS-V hunkers down thanks to sticky Michelin Pilot Sport. There is little body roll and the steering provides quick and precise turn-in. The ATS was already a pretty decent handling car, but Cadillac knew that it could be better. The stiffness of the chassis has been increased by 25 percent and there is the newest version of GM’s Magnetic Ride Control system that is faster when it comes adjusting the damping characteristics of the shocks. Three modes (Touring, Sport, and Track) can vary the stiffness of the shocks along with the behavior of the engine and steering. 
      When you decided that you had enough fun and it is time to go back to the daily grind, the ATS-V turns into a comfortable cruiser. With the vehicle in Touring mode, the ride is compliant with some bumps making their way inside. Road and wind noise is kept to very acceptable levels.
      One item that we were disappointed not to have on our test ATS-V was blind spot monitoring. This is part of a $1,500 Safety and Security package that also adds lane keep assist, forward collision alert, rear-cross traffic alert, and more. For a vehicle that begins that begins just a hair over $62,000, you think blind spot monitor would be standard. It should.
      Cadillac has been making great strides since the first-generation CTS-V and the ATS-V is the beneficiary of it. The powertrains will nail you to your seats and the handling can match or surpass the class leaders. But Cadillac is still stumbling over some simple things such as the interior materials and the infotainment system. It is an amazing driving vehicle, but it is let down by the interior.
      At the end of the week, I couldn’t deny this is an impressive vehicle even with the interior issues. It was very much worth the long wait.
      Cheers: Jaw-Dropping performance, Sharp handling, Looks that make it stand out from the crowd
      Jeers: Carbon Fiber package isn't worth the money or worry, Interior doesn't feel like it is worth the price, CUE
      Disclaimer: Cadillac Provided the ATS-V, Insurance, and One Tank of Gas
      Year: 2016
      Make: Cadillac
      Model: ATS-V Coupe
      Trim: N/A
      Engine: 3.6L SIDI DOHC Twin-Turbo V6
      Driveline: Eight-Speed Automatic, Rear-Wheel Drive
      Horsepower @ RPM: 464 @ 5,850
      Torque @ RPM: 445 @ 3,500
      Fuel Economy: City/Highway/Combined - 16/24/19
      Curb Weight: 3,803 lbs
      Location of Manufacture: Lansing, MI
      Base Price: $62,665
      As Tested Price: $79,205 (Includes $995.00 Destination Charge)
      Options:
      Carbon Fiber Package - $5,000.00
      Recaro Performance Seats - $2,300.00
      Luxury Package - $2,100.00
      8-Speed Automatic Transmission - $2,000.00
      Performance Data Recorder - $1,300.00
      Power Sunroof - $1,050.00
      18-inch Polished Wheels - $900.00
      Dark Gold Brembo Calipers - $595.00
      Sueded Microfiber Steering Wheels and Shifter - $300.00
    • By William Maley
      Over the weekend, General Motors published and then deleted the power figures for the new 6.6L Duramax Diesel V8 that would be appearing in the 2017 Chevrolet Silverado HD and GMC Sierra HD. Today at the Texas State Fair, GM revealed everything about this new engine.
      We'll begin with the most important detail, power output. The numbers that GM revealed match the numbers posted to their powertrain site - 445 horsepower and 910 pound-feet of torque. Compared to the current Duramax V8, the new engine produces 48 more horsepower and 145 more pound-feet of torque.
      How was GM able to pull this off? They basically went through the engine with a fine tooth comb and made various changes. GM says 90 percent of this engine has been changed. Some of the changes include new electronically controlled, variable-vane turbocharger, revised cylinder heads, improved cooling, and revised fuel delivery system. The updated Duramax can also run B20 bio-diesel.
      Figures for payload and towing will be announced at a later date.
      Source: Chevrolet, GMC
      Press Release is on Page 2


      DALLAS — Chevrolet today announced the redesigned Duramax 6.6L V-8 turbo-diesel offered on the 2017 Silverado HD. This next-generation redesign offers more horsepower and torque than ever — an SAE-certified 445 horsepower (332 kW) and 910 lb.-ft. (1,234 Nm) — to enable easier, more confident hauling and trailering.
      Along with a 19 percent increase in max torque over the current Duramax 6.6L, the redesigned turbo-diesel’s performance is quieter and smoother, for greater refinement. In fact, engine noise at idle is reduced 38 percent.
      “With nearly 2 million sold over the past 15 years, customers have forged a bond with the Duramax diesel based on trust and capability,” said Dan Nicholson, vice president, Global Propulsion Systems. “The new Duramax takes those traits to higher levels.”
      The new Duramax 6.6L shares essentially only the bore and stroke dimensions of the current engine and incorporates a new, GM-developed control system. The Duramax’s signature low-rpm torque production hasn’t changed and still offers 90 percent of peak torque at a low 1,550 rpm and sustains it through 2,850 rpm.
      “Nearly everything about the Duramax is new, designed to produce more torque at lower rpm and more confidence when trailering or hauling,” said Gary Arvan, chief engineer. “You’ll also notice the refinement improvements the moment you start the engine, and appreciate them as you cruise quietly down the highway — with or without a trailer.”
      Additional highlights include:
      New, stronger cylinder block and cylinder heads New, stronger rotating and reciprocating assembly Increased oil- and coolant-flow capacity New EGR system with single cooler and integrated bypass New electrically actuated/electronically controlled turbocharging system All-new advanced solenoid fuel system All-new electronic controls New full-length damped steel oil pan that contributes to quietness New rocker cover/fuel system acoustical treatments B20 bio-diesel compatibility SAE-certified 445 net horsepower (332 kW) at 2,800 rpm SAE-certified 910 net lb.-ft. of torque (1,234 Nm) at 1,600 rpm A new, patent-pending vehicle air intake system — distinguished on the Silverado HD by a bold hood scoop — drives cool, dry air into the engine for sustained performance and cooler engine temperatures during difficult conditions, such as trailering on steep grades. Cooler air helps the engine run better under load, especially in conditions where engine and transmission temperatures can rise quickly. That allows the Duramax to maintain more power and vehicle speed when trailering in the toughest conditions.
      The intake design is another example of the advanced integration included in the 2017 Silverado HD that makes it over-the-road capable.   
      A strong foundation
      As with previous versions, the new Duramax block features a strong cast-iron foundation known for its durability, with induction-hardened cylinder walls and five nodular iron main bearings. It retains the same 4.05-inch (103mm) and 3.89-inch (99mm) bore and stroke dimensions as the current engine, retaining the Duramax’s familiar 6.6L (403 cu.-in./6,599 cc) displacement.
      A deep-skirt design and four-bolt, cross-bolted main caps help ensure the block’s strength and enable more accurate location of the rotating assembly. A die-cast aluminum lower crankcase also strengthens the engine block and serves as the lower engine cover, while reducing its overall weight.
      The new engine block incorporates larger-diameter crankshaft connecting rod journals than the current engine, enabling the placement of a stronger crankshaft and increased bearing area to handle higher cylinder loads.
      An enhanced oiling circuit, with higher flow capacity and a dedicated feed for the turbocharger, provides increased pressure at the turbo and faster oil delivery. Larger piston-cooling oil jets at the bottom of the cylinder bores spray up to twice the amount of engine oil into oil galleries under the crown of the pistons, contributing to lower engine temperature and greater durability.
      A new, two-piece oil pan contributes to the new Duramax’s quieter operation. It consists of a laminated steel oil pan with an upper aluminum section. The aluminum section provides strength-enhancing rigidity for the engine, but a pan made entirely of aluminum would radiate more noise, so the laminated steel lower section is added to dampen noise and vibration.
      There’s also an integrated oil cooler with 50 percent greater capacity than the current engine’s, ensuring more consistent temperatures at higher engine loads.
      Segment firsts
      Re-melt piston bowl rim Venturi Jet Drain Oil Separator Closed-loop glow plug temperature control Stronger pistons with remelt
      A tough, forged micro-alloy steel crankshaft anchors the new Duramax’s stronger rotating assembly. Cut-then-rolled journal fillets contribute to its durability by strengthening the junction where the journals — the round sections on which the bearings slide — meet the webs that separate the main and rod journals.
      The connecting rods are stronger, too, and incorporate a new 45-degree split-angle design to allow the larger-diameter rod bearings to pass through the cylinder bores during engine assembly. They’re forged and sintered with a durable powdered metal alloy, with a fractured-cap design enabling more precise cap-to-rod fitment. 
      A new, stronger cast-aluminum piston design tops off the rotating assembly. It features a taller crown area and a remelted combustion bowl rim for greater strength. Remelting is an additional manufacturing process for aluminum pistons in which the bowl rim area is reheated after casting and pre-machining, creating a much finer and more consistent metal grain structure that greatly enhances thermal fatigue properties.
      Additionally, the Duramax’s pistons don’t use pin bushings, reducing reciprocating weight to help the engine rev quicker and respond faster to throttle changes.
      Lightweight cylinder heads, solenoid injectors
      The redesigned engine retains the Duramax’s signature first-in-class aluminum cylinder head design, with six head bolts per cylinder and four valves per cylinder. The aluminum construction helps reduce the engine’s overall weight, while the six-bolt design provides exceptional head-clamping strength — a must in a high-compression, turbocharged application.
      A new aluminum head casting uses a new double-layer water core design that separates and arranges water cores in layers to create a stiffer head structure with more precise coolant flow control. The heads’ airflow passages are also heavily revised to enhance airflow, contributing to the engine’s increased horsepower and torque.
      The Duramax employs a common-rail direct injection fuel system with new high-capability solenoid-type injectors. High fuel pressure of 29,000 psi (2,000 bar) promotes excellent fuel atomization for a cleaner burn that promotes reduced particulate emissions. The new injectors also support up to seven fuel delivery events per combustion event, contributing to lower noise, greater efficiency and lower emissions. Technology advancements enable less-complex solenoid injectors to deliver comparable performance to piezo-type injectors.
      Electronically controlled, variable-geometry turbocharging system
      A new electronically controlled, variable-vane turbocharger advances the Duramax’s legacy of variable-geometry boosting. Compared to the current engine, the system produces higher maximum boost pressure — 28 psi (195 kPa) — to help the engine make more power, and revisions to enhance the capability of the exhaust-brake system.
      Along with a new camshaft profile and improved cylinder head design, the Duramax’s new variable-vane turbocharger enables the engine to deliver more power with lower exhaust emissions. It uses a more advanced variable-vane mechanism, allowing a 104-degree F (40 C) increase in exhaust temperature capability. The self-contained mechanism decouples movement from the turbine housing, allowing operation at higher temperature. That enables the engine to achieve higher power at lower cylinder pressure. Additionally, it has lower internal leakage, allowing more exhaust energy to be captured during exhaust braking.
      The integrated exhaust brake system makes towing less stressful by creating added backpressure in the exhaust, resulting in negative torque during deceleration and downhill driving, enhancing driver control and prolonging brake pad life.
      Venturi Jet Drain Oil Separator
      A new Venturi Jet Drain Oil Separator employed with the Duramax 6.6L is the first of its type in the segment and is designed to ensure oil control in sustained full-load operation. The totally sealed system collects the fine mist of oil entrained in the blow-by gas and uses a small portion of the boosted air generated by the turbocharger to pump the collected oil back to the engine oil sump for re-use by the engine. Less sophisticated systems are not able to return this oil during full-load operation, which can result in oil carryover into the cylinders during combustion.
      Cold Start System
      The new Duramax also provides outstanding cold-weather performance, with microprocessor-controlled glow plugs capable of gas-engine-like starting performance in fewer than 3 seconds in temperatures as low as -20 degrees F (-29 C) without a block heater. The system is enhanced with ceramic glow plugs and automatic temperature compensation — a first-in-class feature providing improved robustness and capability. The automatic temperature compensation assesses and adjusts the current to each glow plug for every use, providing optimal temperature for cold start performance and durability.     
      Electronic throttle valve and cooled EGR
      Unlike a gasoline engine, a diesel engine doesn’t necessarily require a throttle control system. The Duramax 6.6L employs an electronic throttle valve to regulate intake manifold pressure in order to increase exhaust gas recirculation (EGR) rates. It also contributes to smoother engine shutdown.
      Additionally, a cooled exhaust gas recirculation (EGR) system enhances performance and helps reduce emissions by diverting some of the engine-out exhaust gas and mixing it back into the fresh intake air stream, which is fed through the cylinder head for combustion. This lowers combustion temperatures, improving emissions performance by reducing NOx formation.
      The exhaust is cooled in a unique heat exchanger before it’s fed into the intake stream through a patented EGR mixing device, further improving emissions and performance capability. An integrated bypass allows non-cooled exhaust gas to be fed back into the system to help the engine more quickly achieve optimal operating temperature when cold.
      B20 Biodiesel Capability
      The new Duramax 6.6L is capable of running on B20 biodiesel, a fuel composed of 20 percent biodiesel and 80 percent conventional diesel. B20 helps lower carbon dioxide emissions and lessens dependence on petroleum. It is a domestically produced, renewable fuel made primarily of plant matter — mostly soybean oil.
      Manufacturing
      The new Duramax 6.6L turbo-diesel engine is produced with locally and globally sourced parts at the DMAX Ltd. (GM’s joint venture with Isuzu) manufacturing facility in Moraine, Ohio.
      Allison 1000 Automatic Transmission
      The proven Allison 1000 six-speed automatic transmission is matched with the new Duramax 6.6L. A number of refinements have been made to accommodate the engine’s higher torque capacity, including a new torque converter.
      The Allison 1000’s technologically advanced control features, such as driver shift control with manual shift feature and a patented elevated idle mode cab warm-up feature, haven’t changed. Also, the Tow/Haul mode reduces shift cycling for better control and improved cooling when towing or hauling heavy loads.
      There’s also a smart diesel exhaust brake feature that enhances control when descending steep grades.

      View full article
    • By William Maley
      Over the weekend, General Motors published and then deleted the power figures for the new 6.6L Duramax Diesel V8 that would be appearing in the 2017 Chevrolet Silverado HD and GMC Sierra HD. Today at the Texas State Fair, GM revealed everything about this new engine.
      We'll begin with the most important detail, power output. The numbers that GM revealed match the numbers posted to their powertrain site - 445 horsepower and 910 pound-feet of torque. Compared to the current Duramax V8, the new engine produces 48 more horsepower and 145 more pound-feet of torque.
      How was GM able to pull this off? They basically went through the engine with a fine tooth comb and made various changes. GM says 90 percent of this engine has been changed. Some of the changes include new electronically controlled, variable-vane turbocharger, revised cylinder heads, improved cooling, and revised fuel delivery system. The updated Duramax can also run B20 bio-diesel.
      Figures for payload and towing will be announced at a later date.
      Source: Chevrolet, GMC
      Press Release is on Page 2


      DALLAS — Chevrolet today announced the redesigned Duramax 6.6L V-8 turbo-diesel offered on the 2017 Silverado HD. This next-generation redesign offers more horsepower and torque than ever — an SAE-certified 445 horsepower (332 kW) and 910 lb.-ft. (1,234 Nm) — to enable easier, more confident hauling and trailering.
      Along with a 19 percent increase in max torque over the current Duramax 6.6L, the redesigned turbo-diesel’s performance is quieter and smoother, for greater refinement. In fact, engine noise at idle is reduced 38 percent.
      “With nearly 2 million sold over the past 15 years, customers have forged a bond with the Duramax diesel based on trust and capability,” said Dan Nicholson, vice president, Global Propulsion Systems. “The new Duramax takes those traits to higher levels.”
      The new Duramax 6.6L shares essentially only the bore and stroke dimensions of the current engine and incorporates a new, GM-developed control system. The Duramax’s signature low-rpm torque production hasn’t changed and still offers 90 percent of peak torque at a low 1,550 rpm and sustains it through 2,850 rpm.
      “Nearly everything about the Duramax is new, designed to produce more torque at lower rpm and more confidence when trailering or hauling,” said Gary Arvan, chief engineer. “You’ll also notice the refinement improvements the moment you start the engine, and appreciate them as you cruise quietly down the highway — with or without a trailer.”
      Additional highlights include:
      New, stronger cylinder block and cylinder heads New, stronger rotating and reciprocating assembly Increased oil- and coolant-flow capacity New EGR system with single cooler and integrated bypass New electrically actuated/electronically controlled turbocharging system All-new advanced solenoid fuel system All-new electronic controls New full-length damped steel oil pan that contributes to quietness New rocker cover/fuel system acoustical treatments B20 bio-diesel compatibility SAE-certified 445 net horsepower (332 kW) at 2,800 rpm SAE-certified 910 net lb.-ft. of torque (1,234 Nm) at 1,600 rpm A new, patent-pending vehicle air intake system — distinguished on the Silverado HD by a bold hood scoop — drives cool, dry air into the engine for sustained performance and cooler engine temperatures during difficult conditions, such as trailering on steep grades. Cooler air helps the engine run better under load, especially in conditions where engine and transmission temperatures can rise quickly. That allows the Duramax to maintain more power and vehicle speed when trailering in the toughest conditions.
      The intake design is another example of the advanced integration included in the 2017 Silverado HD that makes it over-the-road capable.   
      A strong foundation
      As with previous versions, the new Duramax block features a strong cast-iron foundation known for its durability, with induction-hardened cylinder walls and five nodular iron main bearings. It retains the same 4.05-inch (103mm) and 3.89-inch (99mm) bore and stroke dimensions as the current engine, retaining the Duramax’s familiar 6.6L (403 cu.-in./6,599 cc) displacement.
      A deep-skirt design and four-bolt, cross-bolted main caps help ensure the block’s strength and enable more accurate location of the rotating assembly. A die-cast aluminum lower crankcase also strengthens the engine block and serves as the lower engine cover, while reducing its overall weight.
      The new engine block incorporates larger-diameter crankshaft connecting rod journals than the current engine, enabling the placement of a stronger crankshaft and increased bearing area to handle higher cylinder loads.
      An enhanced oiling circuit, with higher flow capacity and a dedicated feed for the turbocharger, provides increased pressure at the turbo and faster oil delivery. Larger piston-cooling oil jets at the bottom of the cylinder bores spray up to twice the amount of engine oil into oil galleries under the crown of the pistons, contributing to lower engine temperature and greater durability.
      A new, two-piece oil pan contributes to the new Duramax’s quieter operation. It consists of a laminated steel oil pan with an upper aluminum section. The aluminum section provides strength-enhancing rigidity for the engine, but a pan made entirely of aluminum would radiate more noise, so the laminated steel lower section is added to dampen noise and vibration.
      There’s also an integrated oil cooler with 50 percent greater capacity than the current engine’s, ensuring more consistent temperatures at higher engine loads.
      Segment firsts
      Re-melt piston bowl rim Venturi Jet Drain Oil Separator Closed-loop glow plug temperature control Stronger pistons with remelt
      A tough, forged micro-alloy steel crankshaft anchors the new Duramax’s stronger rotating assembly. Cut-then-rolled journal fillets contribute to its durability by strengthening the junction where the journals — the round sections on which the bearings slide — meet the webs that separate the main and rod journals.
      The connecting rods are stronger, too, and incorporate a new 45-degree split-angle design to allow the larger-diameter rod bearings to pass through the cylinder bores during engine assembly. They’re forged and sintered with a durable powdered metal alloy, with a fractured-cap design enabling more precise cap-to-rod fitment. 
      A new, stronger cast-aluminum piston design tops off the rotating assembly. It features a taller crown area and a remelted combustion bowl rim for greater strength. Remelting is an additional manufacturing process for aluminum pistons in which the bowl rim area is reheated after casting and pre-machining, creating a much finer and more consistent metal grain structure that greatly enhances thermal fatigue properties.
      Additionally, the Duramax’s pistons don’t use pin bushings, reducing reciprocating weight to help the engine rev quicker and respond faster to throttle changes.
      Lightweight cylinder heads, solenoid injectors
      The redesigned engine retains the Duramax’s signature first-in-class aluminum cylinder head design, with six head bolts per cylinder and four valves per cylinder. The aluminum construction helps reduce the engine’s overall weight, while the six-bolt design provides exceptional head-clamping strength — a must in a high-compression, turbocharged application.
      A new aluminum head casting uses a new double-layer water core design that separates and arranges water cores in layers to create a stiffer head structure with more precise coolant flow control. The heads’ airflow passages are also heavily revised to enhance airflow, contributing to the engine’s increased horsepower and torque.
      The Duramax employs a common-rail direct injection fuel system with new high-capability solenoid-type injectors. High fuel pressure of 29,000 psi (2,000 bar) promotes excellent fuel atomization for a cleaner burn that promotes reduced particulate emissions. The new injectors also support up to seven fuel delivery events per combustion event, contributing to lower noise, greater efficiency and lower emissions. Technology advancements enable less-complex solenoid injectors to deliver comparable performance to piezo-type injectors.
      Electronically controlled, variable-geometry turbocharging system
      A new electronically controlled, variable-vane turbocharger advances the Duramax’s legacy of variable-geometry boosting. Compared to the current engine, the system produces higher maximum boost pressure — 28 psi (195 kPa) — to help the engine make more power, and revisions to enhance the capability of the exhaust-brake system.
      Along with a new camshaft profile and improved cylinder head design, the Duramax’s new variable-vane turbocharger enables the engine to deliver more power with lower exhaust emissions. It uses a more advanced variable-vane mechanism, allowing a 104-degree F (40 C) increase in exhaust temperature capability. The self-contained mechanism decouples movement from the turbine housing, allowing operation at higher temperature. That enables the engine to achieve higher power at lower cylinder pressure. Additionally, it has lower internal leakage, allowing more exhaust energy to be captured during exhaust braking.
      The integrated exhaust brake system makes towing less stressful by creating added backpressure in the exhaust, resulting in negative torque during deceleration and downhill driving, enhancing driver control and prolonging brake pad life.
      Venturi Jet Drain Oil Separator
      A new Venturi Jet Drain Oil Separator employed with the Duramax 6.6L is the first of its type in the segment and is designed to ensure oil control in sustained full-load operation. The totally sealed system collects the fine mist of oil entrained in the blow-by gas and uses a small portion of the boosted air generated by the turbocharger to pump the collected oil back to the engine oil sump for re-use by the engine. Less sophisticated systems are not able to return this oil during full-load operation, which can result in oil carryover into the cylinders during combustion.
      Cold Start System
      The new Duramax also provides outstanding cold-weather performance, with microprocessor-controlled glow plugs capable of gas-engine-like starting performance in fewer than 3 seconds in temperatures as low as -20 degrees F (-29 C) without a block heater. The system is enhanced with ceramic glow plugs and automatic temperature compensation — a first-in-class feature providing improved robustness and capability. The automatic temperature compensation assesses and adjusts the current to each glow plug for every use, providing optimal temperature for cold start performance and durability.     
      Electronic throttle valve and cooled EGR
      Unlike a gasoline engine, a diesel engine doesn’t necessarily require a throttle control system. The Duramax 6.6L employs an electronic throttle valve to regulate intake manifold pressure in order to increase exhaust gas recirculation (EGR) rates. It also contributes to smoother engine shutdown.
      Additionally, a cooled exhaust gas recirculation (EGR) system enhances performance and helps reduce emissions by diverting some of the engine-out exhaust gas and mixing it back into the fresh intake air stream, which is fed through the cylinder head for combustion. This lowers combustion temperatures, improving emissions performance by reducing NOx formation.
      The exhaust is cooled in a unique heat exchanger before it’s fed into the intake stream through a patented EGR mixing device, further improving emissions and performance capability. An integrated bypass allows non-cooled exhaust gas to be fed back into the system to help the engine more quickly achieve optimal operating temperature when cold.
      B20 Biodiesel Capability
      The new Duramax 6.6L is capable of running on B20 biodiesel, a fuel composed of 20 percent biodiesel and 80 percent conventional diesel. B20 helps lower carbon dioxide emissions and lessens dependence on petroleum. It is a domestically produced, renewable fuel made primarily of plant matter — mostly soybean oil.
      Manufacturing
      The new Duramax 6.6L turbo-diesel engine is produced with locally and globally sourced parts at the DMAX Ltd. (GM’s joint venture with Isuzu) manufacturing facility in Moraine, Ohio.
      Allison 1000 Automatic Transmission
      The proven Allison 1000 six-speed automatic transmission is matched with the new Duramax 6.6L. A number of refinements have been made to accommodate the engine’s higher torque capacity, including a new torque converter.
      The Allison 1000’s technologically advanced control features, such as driver shift control with manual shift feature and a patented elevated idle mode cab warm-up feature, haven’t changed. Also, the Tow/Haul mode reduces shift cycling for better control and improved cooling when towing or hauling heavy loads.
      There’s also a smart diesel exhaust brake feature that enhances control when descending steep grades.
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