Developed in cooperation with Volvo Trucks and the Volvo Group, the D5 and D8 engines have a redesigned platform and advanced fuel injection and after-treatment systems.
Although the D5 and D8 engines are new to Volvo Penta in Tier 2/Stage II and Tier 3/Stage III configuration, the same base units have been subjected to hundreds of thousands of hours of running by Volvo Trucks and Volvo Buses, and have undergone extensive field tests in a variety of applications and machines.
Volvo Penta’s Tier 4 Final/Stage IV D5 and D8 engines are currently available for order. The company will begin delivering its Tier 2/Stage II and Tier 3/Stage IIIA models in the third quarter of 2014.
The engines share the same base engine design as their D11, D13 and D16 counterparts, as well as a common electronics platform that allows them to communicate using the same protocol, regardless of emissions level. Their inline four- and six-cylinder design features a common design footprint, with components such as the turbocharger located in the same place on all models. Displacement in the D5 and D8 is increased compared to previous versions, offering improved engine block stiffness, as well as higher torque at low speed. But despite the larger displacement, fuel consumption is also reduced by as much as 2.5%.
“OEMs can replace their 6litre or 7litre six-cylinder engines with the four-cylinder D5, due to its higher power density. Downsizing to a four-cylinder engine, with its lower weight and smaller physical size, makes installation easier. And despite the increase in power, the new D5 and D8 also benefit from better fuel economy,” says Volvo Penta.
With its D5 and D8 engines, Volvo Penta has kept the Tier 3/Stage III after-treatment system simple. “While most engine manufacturers have incorporated exhaust gas recirculation (EGR) into their Tier 3/Stage III models, Volvo Penta engineered its Tier 3/Stage III D5 and D8 engines to burn so cleanly that, like their Tier 2/Stage II counterparts, they don’t need the addition of an EGR.
While most Tier 4 Final/Stage IV engines require a diesel particulate filter (DPF) or diesel oxidation catalyst (DOC), Volvo Penta’s Tier 4 Final/Stage IV engines use only Selective catalytic reduction (SCR),” says the company.
