Heavy Duty Trucking, June 2017

less horsepower consumed by the fan and the water pump theres more power available at the wheels which can reduce the number of downshifts required in hilly terrain which all means less fuel burned to get the job done When coupled with the GPS based predictive cruise control system the engine can decide how to most efficiently operate in various conditions depending on expected power demand over the next few miles During evaluation on our Illinois Kentucky hilly route which is a 98 match with our typical on highway customer route profile we exceeded 8 mpg without the benefit of predictive cruise control says Nachtman The A26 is the new kid on the block this year so everyone will be watching it closely Paccar MX 11 and MX 13 Paccars 2017 lineup includes new ratings for the 108 liter MX 11 of 430 hp and 1650 lb ft and 510 hp and 1850 lb ft for the 129 liter MX 13 The MX 11 also gets a new rating on the low end 335 hp and 1150 lb ft The majority of the MX engine lineup now delivers peak torque at 900 rpm which supports the wider use of downsped drivelines Paccar says it has evolved the injectors and pistons on the MX 13 to drive further efficiencies in the combustion cycle Engineers have also opted for different turbochargers for engines rated above or below 485 hp The GHG17 compliant 2017 MX 13 and MX 11 engines now feature a single cylinder air compressor along with an electronically controlled variable displacement oil pump based on pressure and temperature and a variable speed coolant pump that responds to heat rejection demands Together these eliminate some of the parasitic drag on the engine leaving more output to drive the truck Earlier this year Kenworth announced an update to its predictive cruise control functionality with the new MX 11 and 13 engines This update came with the launch of the new 2017 emission engines and provides up to a 1 improvement in fuel economy says Kurt Swihart Kenworth marketing director Predictive cruise control combines GPS with cruise control to optimize cruising speed based on topographical GPS data inputs In certain types of terrain such as rolling hills as the truck ascends and crests a hill predictive cruise control will allow the vehicle speed to drop slightly below the set cruise speed This boosts fuel economy since the truck is now using momentum instead of fuel to maintain set cruise speed Paccar has also developed a single canister aftertreatment system that combines the DPF SCR and DEF mixing pipe This innovative single canister aftertreatment system improves serviceability extends service intervals and reduces weight by up to 100 pounds says Darrin Siver Peterbilt general manager and Paccar vice president Volvo Group Both Mack and Volvo continue to offer three heavy duty engine platforms for 2017 the 108 liter D11 Mack MP7 the 128 liter D13 MP8 and 161 liter D16 MP10 All are GHG17 compliant and they feature a number of noteworthy hardware changes It all begins with the addition of common rail fuel injection This is something new to Mack and Volvo but common on other engines John Moore Volvo Trucks powertrain product marketing manager says the common rail system allows for multiple injection events at very high injection pressures This allows for very precise injection timing and because we can introduce the fuel to the cylinder in stages we get a more complete burn with less soot production he says Combined with the wave piston design which came from our SuperTruck research we have almost eliminated 90 reduction Volvo says soot from the combustion process That takes a big load off the aftertreatment system Macks technology product manager Scott Barraclough says the engines also feature a two speed clutched coolant pump on certain engine ratings for lower parasitic loss Earlier this year Mack and Volvo added optional turbo compounding to their 13L offerings delivering an additional 30 50 hp to the flywheel through fluid coupled gearing Looking at it another way turbo compounding takes a 50 hp load off the engine for additional fuel savings We have tuned this as an efficiency enhancement rather than a performance addition says Barraclough If you have a 450 hp engine you only have to fuel it for say 420 hp taking that much more load off the engine Mack and Volvo have also improved the design of their aftertreatment system bringing it into a smaller package and using a copper zeolite catalyst for improved NOX conversion Mack and Volvo use the same basic engine platforms but program the engines differently for their own specifications Both companies say we can expect fuel economy improvements in the 2 3 range in the small block engine and up to a 65 or better improvement in the mid range D13 and MP8 engines specd for downsped operation HDT JUNE 2017 54 WWW TRUCKINGINFO COM SPECIAL ISSUE CUTTING FUEL COSTS Paccar is switching to a single can aftertreatment system that saves about 100 pounds makes servicing easier and frees up valuable frame space Volvo Group engines are now using common rail fuel injection and the new wave piston to optimize combustion and nearly eliminate soot as a byproduct Mack will add turbo compounding to is MP8 engine lineup in the spring as will the Volvo D13 PHOTO PACCAR PHOTO MACK PHOTO VOLVO