Cooling ducts

The cooling ducts in the cylinder head are now also used for indirect cooling of the solenoid valve injectors. This means that coolant flows all around the valves and solenoid valve injector. This has reduced the heat contribution to the components. The cylinder liners are made of die-cast aluminum. To optimize engine cooling, the bridges between the cylinders have grooves. Coolant can flow through these grooves from one side of the crankcase to the other and cool down the bridges.