A combination of a 76A angle between the two banks of cylinders and a crankshaft with 28A phasing between the crankpins
virtually eliminates vibration.
And the crankpins
are staggered 70 degrees apart, giving firing intervals that produce what Ducati calls a Twin Pulse firing order.
Constructively they are made of main journals and crankpins and connecting them cheeks, located in different spatial positions.
It is possible to produce by the ESC method with melting together, using consecutive melting of the cheeks with simultaneous melting to them of the manufactured beforehand crankpins, not just separate cranks but entirely the whole crankshaft, whereby main journals and crankpins are installed into respective holes in walls of the water-cooled mould designed for ESC of the cheeks (Figure 2, a).
Orbital grinding of crankpins on large diesel crankshafts while recognizing that the concentric main bearing journals of these parts have typically been ground on single-wheel, in-line cylindrical grinders was initially proposed.
They have incorporated the latest generation of highly flexible, accurate, and productive CNC orbital crankpin grinders with CBN abrasives, whereas the use of older style indexing-type crankpin grinders with conventional grinding wheels is still very prevalent in the global diesel engine industry.
Shellac bond: It's an organic bond used for grinding wheels that produce very smooth finishes on parts such as rolls, cutlery, camshafts and crankpins
Crankpins were done on stand-alone Landis grinders that index to grind all crankpin surfaces in one setup.
These transfer lines provide a significant productivity increase over individual machines grinding all crankpins in one loading.
Each stage had an independent cylinder, piston, vane, and crankpin that was part of the crankshaft and engaged with the piston.
To calculate the frictional forces acting on surfaces between the vane and piston, between the piston and crankpin, and of main bearing, Coulomb's friction law is applied.