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36 www.coalage.com May 2018 diesel engines continued ease of maintenance as key factors in the engine line's appeal to mining customers, which also includes the prospect of lower fuel consumption, decreased emissions in day-to-day operations, and engine perfor- mance characteristics suitable for use in a wide range of mine production equipment. Volvo Penta introduced a new 8-liter diesel engine with aftertreatment system as the next model in its European Union (EU) Stage V range. The new model is part of the company's spectrum of Stage V-compliant engines that include its D5, D8, D11, D13 and D16 engines, offering a power range from 105 to 565 kW (143-770 hp). The 8-liter off-road industrial diesel engine by Volvo Penta has a power output of up to 235 kW. Stage V regulations for Europe will be im- plemented in 2019, requiring new emission limits for diesel and spark-ignited engines. The scope of the legislation is set to widen, as engines below 19 kW and above 560 kW will be regulated for the first time. And while current Stage IV regulations limit the overall mass of particle emissions, Stage V will also constrain the number of particles emitted. Although international emissions standards for offroad engines in the EU, USA and Japan were largely "harmonized" up to and includ- ing the U.S. EPA's Tier 3 and Tier 4 standards, the EU's Stage V rules breaks this harmoni- zation by requiring diesel particulate filters (DPF) to meet PN (particle number) stan- dards on all affected engines, while Tier 4 standards can be satisfied without filters. According to Volvo Penta, the new D8 Stage V engine has been equipped with a fixed geometry turbocharger, which con- tributes to reduced complexity. It features a common rail injection and has a power output of 160-235 kW. The air inlet throttle, together with the uncooled exhaust gas re- circulation (EGR), and the electrical exhaust pressure governor (EPG) deliver effective heat management, enabling the system to function without the need to inject fuel into the exhaust stream to raise the temperature. With this approach, the exhaust gas is at optimal temperature when it passes through the exhaust aftertreatment system (EATS). Low heat rejection from the overall system means that less cooling is required. The Stage V engine and EATS, said Vol- vo Penta, are designed to work together to maximize passive regeneration during normal operation. With this approach, high-temperature regeneration is unnec- essary because sulfur regeneration in the SCR catalyst is not required. Only soot re- generation is needed to clean the DPF. No additional fuel injector for sulfur regen- eration is needed. This leads to increased fuel efficiency and uptime. Gassing Up the Fleet In November, Caterpillar announced it will offer a dynamic gas blending (DGB) retrofit kit for its 785C mining truck. Enabling the hauler's engine to run on both diesel and liquefied natural gas (LNG). The 785C ret- rofit kit is the first DGB system Cat has of- fered for mining machines, and it became available for purchase in January from Cat Volvo Penta's newest 8-liter Stage V compliant diesel is designed with an exhaust gas aftertreatment system that maximizes passive regeneration during normal operation.