Cooling System: Description and Operation
CoolingThe cooling concept is an enhancement based on the effective cylinder head cross-flow cooling used on previous models and was developed to selectively cool the hot spots in the cylinder head and crankcase. The design and position of the new coolant pump as well as the revamped internal engine cooling ducts in particular in the cylinder head are new.
The new coolant pump is no longer located in the crankcase as an integral component, but instead it is attached to the outside of the crankcase on cylinder bank side 1-3 as a separate module driven by the belt. The advantage of this design is that it flexibly adapts the size of the water pump and reduces the maintenance costs if maintenance is required. To adapt to the improved engine performance and ensure adequate engine cooling, the maximum volume flow of the new pump has been increased by approx. 20%.
The greater engine power has resulted in a greater cooling requirement in the area of the cylinder head. The cooling ducts in the cylinder head have been revamped and the hottest spot on the positioning ring of the outlet valves has been additionally cooled to ensure cooling in this area, which is subject to substantial thermal loads.
This measure and the complete overhaul of the internal engine cooling have achieved steady and intense cooling in all operating states.
