FEV did not split the crankshaft, but instead adopted the method of dividing the inner and outer rings of the roller bearing. Bearings are purchased products, and the segmented roller bearings have actually appeared in the bearing manufacturer's catalog.
However, it is not possible to envisage its use in engines for durability, and the order also requires quite a few unique specifications. Due to the division of the inner and outer rings, the rollers are rotated across the "seam", so the durability requirements are quite strict. The engine also strengthens the bearing cap that directly withstands explosive power.
The crank pin and the small end portion of the connecting rod are still Plain Bearings. Since the loss caused by the "splashing oil supply" to the main bearing is reduced, the effect of reducing the friction loss particularly at a low temperature condition in which the oil viscosity is high is remarkable.
A spare part, spare, service part, repair part, or replacement part, is an interchangeable part that is kept in an inventory and used for the repair or replacement of failed units. Spare parts are an important feature of logistics engineering and supply chain management, often comprising dedicated spare parts management systems.
Capital spares are spare parts which, although acknowledged to have a long life or a small chance of failure, would cause a long shutdown of equipment because it would take a long time to get a replacement for them.
Spare parts are an outgrowth of the industrial development of interchangeable parts and mass production.
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