Scania claims that its new V8 engines offer total savings up to six percent or more under the right conditions, when the new G33 gearbox is included in the powertrain. The fuel savings are the result of extensive fine-tuning and development by Scania’s engineers, involving technologies in the fore-front of internal combustion engine development. Among them, and provided by more than 70 new parts, are reduced internal friction, higher compression ratios, improved aftertreatment-systems and a new powerful engine management system (EMS).
The engine management system interacts with the aftertreatment management system (AMS). They are both highly critical to meet the current and coming Euro 6 regulations regarding NOx and particles. Scania has added a new solution where AdBlue fluid is injected twice – once directly after the exhaust brake and a second dose at the ‘normal’ position in the silencer itself. With the extra dosing, the evaporation of the AdBlue is improved during low load cycles since the temperature is higher near the outlet manifold. With the extra dosing, the aftertreatment strategy is improved and also contributes to better fuel efficiency.
The updated V8 range is now equipped with a new high-pressure fuel pump where the pumping elements are individually controlled (AIM, Active Inlet Metering). The overall pressure and inlet control will be enhanced with improved diagnostics for increased uptime and performance. The new pump is also optimised for minimising engine oil consumption. Also, the compression ratio and the maximum cylinder pressure has been raised, to further improve combustion and fuel efficiency.
An ever-important aim when designing modern, high-performance engines is to reduce internal friction. By reducing internal losses, substantial gains have been achieved.
Göran Lindh, chief engineer for Scania’s V8 engines, said: “Raising the pressure and the power output requires that several components inside the engine, including gears, pistons, rings, cylinder heads and valves, are refined and reinforced. This necessitates advanced fine-tuning and improvements to reduce internal losses, especially since we also wanted to extend maintenance intervals and strengthening durability.”
The top-of-the-line version of Scania’s V8 family is the new DC16 123 engine. With its output of 770 hp, it replaces the previous top-of-the-line showpiece that sported 730 hp. A difference between them is that the 770 hp V8 is based on the same, updated platform as the rest of the new V8 range. Shedding certain heavy components and simplifying others, has lowered the weight by up to 75 kg, compared to its predecessor. Another novelty is that the 770 hp engine, for increased responsiveness, has a unique, fixed geometry turbocharger with ball bearings rather than traditional journal bearings.
Scania’s new range of gearboxes will replace all current automated Scania Opticruise solutions. The first member of the new range, the G33CM, is linked to the updated V8s and Scania’s high-output 13 litre engines with 500 and 540 hp. Start of sales for the first version of the new gearboxes is set for October. They can be coupled with three of Scania’s four Euro 6 V8s and two inline six engines. The first customer trucks with a G33CM-based Scania Opticruise solution will be produced in the first quarter 2021.