Testing shows Volvo Trucks’ 2014 engines delivering up to 3% fuel efficiency improvement over 2013 models
Volvo Trucks’ 2014 heavy-duty engines are providing greater fuel efficiency than anticipated, delivering up to a 3% fuel efficiency improvement compared with their 2013 counterparts, according to the company. A combination of in-lab and on-road testing showed that the initially announced fuel efficiency figures of up to 2% understated actual fuel savings.
We remain focused on ensuring that the ongoing phases of engine and vehicle regulations do not burden our customers, but instead create value for their operations. Introduction of our SCR-equipped models yielded a 5 percent fuel efficiency increase, and we’re pleased to announce that our 2014 engine lineup is delivering up to an additional 3 percent savings.
Fuel efficiency remains top-of-mind across the industry, but there’s no one-size-fits-all solution that will deliver massive improvements. Every drop counts. On average, a 1 percent fuel efficiency improvement amounts to annual savings of more than $650 per truck. Carriers ignoring opportunities for incremental fuel efficiency gains are leaving money on the table.—Göran Nyberg, president, Volvo Trucks North American Sales & Marketing
Refinements and design changes contributing to fuel efficiency improvements in Volvo’s 2014 D11, D13 and D16 engines include:
Low-friction cylinder improvements, including a redesigned piston, liner and oil scraper ring developed with smoother surfaces;
A clutched air compressor, which reduces engine load by completely disengaging the clutch from the engine when not in use;
Advanced combustion technology of a new seven-hole injector, which offers better fuel atomization for a more even distribution of fuel within the cylinder, maximizing fuel efficiency; and
An improved crankcase ventilation system, which filters more oil from blowby gases before they leave the engine and at the same time improves engine backpressure for better performance.
Along with fuel efficiency improvements, a two-piece valve cover on the D13 engine improves serviceability, which helps reduce repair time and is easier to handle than previous covers. Volvo also removed lead from the valvetrain of its 2014 engines to reduce its environmental impact.
In addition to the fuel efficiency gains delivered with 2014 Volvo engine technology, Volvo Trucks’ XE (exceptional efficiency) powertrain package boosts fuel efficiency by up to an additional 3%. Available on Volvo VNM and VNL models equipped with 2014 Volvo engines, the XE11 (405 hp, 1,550 lb-ft torque); XE13 (425 and 455 hp, 1,750 lb-ft torque); and XE16 (500 hp, 2,050 lb-ft torque) packages improve fuel efficiency by lowering engine rpm at a given vehicle speed—i.e., “downspeeding.”
Possible through the combination of Volvo’s standard I-Shift automated manual transmission and Volvo engine with modified software, XE allows the engine to cruise at about 200 rpm less than the average truck sold today.
Fuel efficiency improves by about 1.5% for every 100 rpm of downspeeding, so customers spec’ing the XE package can expect up to a 3% improvement when compared with another overdrive transmission in a similar operation, the company suggested. Demand for XE powertrain packages has grown each year since the initial introduction of XE13 for the D13 engine in September 2011.
The XE11 package, the newest (February 2014) is also the most fuel-efficient Volvo powertrain, Nyberg said.
In 2013, about 87 percent of all Volvo trucks invoiced in the US and Canada were specified with a Volvo engine. Of that population, 23% featured XE powertrain packages.